What this is

A figure-first view of executed Jupyter notebooks. Instead of a wall of cells, you get the scientific structure: figures, datasets and notes as cards, code folded underneath, sections in a sidebar, and a provenance graph of how each result derives from the data. On top of that sits a presentation builder: turn any notebooks into slides and present straight from the browser.

Everything runs locally — in the web version, notebooks are processed in your browser and never uploaded anywhere.

Open notebooks

• Drag & drop one or more .ipynb files anywhere onto the window.
• File ▾ → Open a notebook… (File starts the row under the tabs) — a file picker, or paste a URL to a notebook (GitHub links are converted automatically).
• Notebooks must be executed (run once in Jupyter so outputs are saved) — nothing is re-run here.
• Every open notebook is a tab along the top bar (or a row in the list down the side, if you choose that under File ▾): click to switch, (beside File info) re-reads it after you re-run it in Jupyter, closes.
• Not just notebooks. Markdown (.md, .qmd), LaTeX (.tex), tables (.csv/.tsv) and spreadsheet workbooks (.xlsx — values only, one table per sheet) open through every one of those doors too. They render the same way, keep the same version history (snapshots and git commits alike), place figures onto slides that Update figures can refresh from disk — and each non-notebook tab says what kind of file it is, in the open-files list and its sidebar.
• Notebook-only, on purpose. Plot trace, the dependency graph, the variables panel, note insertion and figure locks all read notebook cells — code, outputs, execution order — which a .tex or a .csv simply does not have. The notebook is the whole thing; other files are sources you can read, quote and refresh.

The ribbon

Like the presentation editor's: File, then two tabs — Filters (what you see) and View (how you see it: Outline, Variables, Raw, Tree, Pages and the figure and text sizes) — with Create slides, Full screen and Present at the end of the row. The chosen tab's controls are one row under it. The ▴ at the end, a double-click on a tab, or Ctrl+F1 folds that row away; click a tab to bring it back. On a narrow window, groups you reach for less (Apply to, Size, Pages…) fold into a button wearing their name.

Filtering what you see

Four buttons on the Filters tab — Plots, Markdown, Code, Output — each shows its CURRENT state and cycles when clicked. They apply to every tab at once. Plots comes first because a figure is the headline of a cell; everything else a notebook produces is, loosely, its output.

• All four — Plots, Markdown, Code and Output (printed tables, values, text) — cycle On → Fold → Off — the words the buttons themselves show. Fold tucks that part away behind a click-to-open toggle; Off removes it.
• Code means the code in EVERY cell — imports, prints, plotting, a bare expression — not just standalone code cells. So Code: Fold tucks the source away under every figure and result at once, and a cell that is only code disappears entirely when Code is Off.
• Which plots, Which code and Which output (the half joined to each filter) are finer control: untick imports, plotting… on the code side, or print, dataset, numeric, string, list, dict, error… on the output side, to hide just those. Only the types actually present in the notebook are listed. Untick every code type and it is the same as hiding code.
• Apply to chooses which sections the filters above act on. Tick a few headings, set the filters, then pick a different set and filter those differently — every section remembers its own filters, and a section that differs says · filtered next to its heading. Reset puts every filter — and every per-section change — in this notebook back to the defaults.

Figure size

• Figures 100% on the View tab (with and either side) resizes every figure in the feed — click the percentage to snap back to 100%. Figures grow past the text column, so a wide plot really does get wider.
• Point at any figure and its own − + appear at the top left: those resize just that one, on top of the feed-wide setting.
• The button next to them opens that figure full screen — Esc or a click outside closes it.

The sidebar

• A key at the top names every card type present; below it, sections and a jump-to link for every cell.
• Collapse or hide a whole section from its chevron and eye — in the sidebar or on the section heading in the document itself; the two stay in sync. A hidden section leaves the document but keeps its (dimmed) sidebar row so you can bring it back.
• The eye beside any cell — in the sidebar or on the card itself — hides just that one cell; a cell hidden this way stays in the sidebar (dimmed) so its eye can bring it back.
• The analysis graph at the sidebar's foot jumps to any node that declared an #| id:.
• The x² button beside the sections toggle (on the tab row, top left) opens an index of every variable the notebook defines — in definition order or grouped by type. Click a name to jump to the cell that defines it; its › chevron unfolds every cell that defines, redefines or reads it.

Plot trace

Every figure has a Plot trace button. It opens a new tab holding just the cells that build that plot — its whole lineage, load → transform → plot — with a dependency graph at the top. The tab is the same document view, just subset to those cells, so every filter and button still works exactly as it does in the full document. Close the tab (its ) when you are done; the original document is untouched.

Raw notebook

Raw notebook flips the current tab to the notebook exactly as authored — cells in order, directives visible — so you can always see where a title or caption came from.

Keyboard shortcuts

Every shortcut also shows as a key chip in its button’s tooltip.

In the presentation / poster editor:

Make notebooks render better (optional)

Add #| directive lines to the top of a code cell; they are parsed and hidden from display. Everything works without them — they are how you take control:

Collections — cells from any notebook, with your notes

• Press Collect on any cell to keep it in a collection — pick one, or New collection…. For a figure, With the code that makes it also links the cells Plot trace finds behind it.
• Collect showing on the Filters tab puts every cell the filters leave on screen into a collection at once — the setup you keep redoing, filed once, where it stays without filtering again.
• A collection opens as its own tab and reads like a notebook: your order, each card saying which notebook it came from (click that to see the cell there), and the Filters work on it as they do on a notebook. File ▾ → Collection (under New) starts an empty one.
• Under each card: Note adds a note of your own beneath it (Markdown; double-click a note to edit, Ctrl+Enter keeps it), Its code links the code that makes it, Link a cell links any cell from an open notebook. What is linked hangs under the card behind Linked: …, which folds it away and brings it back. Up, Down and Remove (with Undo) arrange it.
• A collection keeps its own copy of every cell, so it opens without the notebooks and does not change when you re-run one. Update from notebooks takes the current copy of every cell whose notebook is open. It saves, opens, renames and deletes like a presentation.

Custom views — a styled, filtered copy of the notebook

• File ▾ → Custom view (under New), or Save as view on the Filters tab, saves how the notebook itself looks. It is not slides: it opens in the document, with a styling bar under the ribbon.
• Style All markdown, All headings or the Document (page colour, spacing) — or click any single markdown cell or heading to style just that one. Colour, size, background, border, corner radius, padding, font and alignment.
• Narrowest wins: a cell beats its section, a section beats the whole view. Anything carrying its own style is marked, and Override N individual styles clears them so they follow the view again.
• Your filters, hidden cells, hidden headings, collapsed sections, figure sizes and text size are saved with the view — so it is also the place to keep an elaborate filter setup you want back later.
• Click the view's tab to reopen it; Done returns the document to its normal styling.

Presentations

• Open notebooks and presentations are one list: tabs along the top bar, with Home before them — or, if you prefer, a list down the left side (File ▾, Open files). Never both. File ▾ is where you make something new, open a presentation, and choose the theme. The top is laid out as PowerPoint's is: the title row has your tabs on the left, the command search in the middle and Save, Autosave and undo on the right; File starts the row under it, with Find, Full screen and Present at that row's end. As a side list, the buttons at its foot collapse or auto-hide it.
• A presentation opens straight in the slide editor. Add content with From notebook (Images tab, under Place) — a draggable, resizable frame that holds any notebook card: drop it on the slide, then click a card in your notebook (from any open tab, so one deck can mix several notebooks) to fill it; swap later with Replace. Pick a slide layout from the diagrams (full, halves, rows, quarters, a title slide, or a blank canvas).
• The editor is a full slide editor: Text, Arrow, Shape (rectangle, ellipse, star, arrow, cloud, and more) and Image. Select anything for colours, precise point size, alignment, bold / italic / underline, line thickness, dash, fill and a smooth opacity slider. Highlight part of a text box to recolour just that run.
• Links. Highlight words in a text box, or select any object, and press Text → Link (or Ctrl+K, or Link on the little bar beside highlighted words): type a web address or a slide’s number. While you present, a click follows it; in the editor a click still just selects. Empty removes the link, and links on words travel to and from .pptx.
• AutoCorrect tidies as you type, the way PowerPoint does: straight quotes curl, a double hyphen becomes an en dash (a third makes an em dash), (c) (r) (tm) become © ® ™, three dots an ellipsis, and -> <- => become arrows. Ctrl+Z straight after puts back what you typed. It leaves Markdown boxes, code, equations and $maths$ alone, and Text → AutoCorrect turns it off (or on again) for this browser.
• Crop an image or a notebook cell (figure, markdown or code) to a shape; group items (shift-click, then Ctrl+G) so they move as one; animate an item so it appears on click ( Animation panel, on the Animation tab); and switch on slide numbers from Design → Header & footer → Page numbers.
• Animation, one question at a time: the Animation tab starts with Build order (Preview, the Animation panel, Quick animate, Layers) and the Add animation gallery. Pick an effect and Timing and Disappear appear beside it; Focus and Motion are in the Animation panel’s Configure tab, and how a slide arrives is Slide transition on the Present tab.
• Slide transitions. Present → Slide transition: Cut, Fade (the old slide fades into the new one), Push (the new slide pushes the old one off), Wipe (the new slide is uncovered from the left), Zoom, and Move, which moves anything on both slides from where it was to where it is. Duration beside them is how long it takes, in seconds; Give it to passes the transition, and its length, to other slides. A .pptx keeps each as PowerPoint's own, at its length (Move as Morph).
• Text a piece at a time: select a text box, give it an effect in Add animation, open Timing, and in Text sequence pick By bullet (one click per bullet, or per line you pressed Enter on) or By sentence. Then choose what each text step does: Reveal shows the piece; Appear + highlight shows it lit up and puts the one before back to normal; Highlight only has every piece on the slide from the start and lights the next one on each click. A bullet can also have a click of its own anywhere in the list, beside a picture: move its row in the Animation panel’s Order tab. A box with no effect yet arrives with Appear. Whole box puts it back to one click.
• The animation story: Story, in the Animation tab’s Whole slide door, shows the slide at every click. Pick a card to edit the slide as it is at that point; Whole slide, the lit card again, or Esc brings everything back. Drag a card to change when that click happens — onto the middle of another card and the two happen together.
• Making something disappear: select it and press Disappear on the Animation tab once it has an effect (or, for anything at all, right-click it → Disappear on a click, or the Animation panel’s when it leaves). It goes on a click of its own; the caret beside the button makes it go on the click something else arrives instead — which is how one picture replaces another. The tile reads never or the click it goes on.
• The View tab is for laying a poster out, where the page is far bigger than the window: Rulers (R) down the top and left in real millimetres, marking where the pointer is and how far the selected item reaches; Grid (G) a 20mm print margin plus twelve columns that items snap to; Side toolbar to move this toolbar to the right edge, which a tall poster wants (portrait posters start that way). Full screen, on the top bar beside Present, edits with the browser chrome gone — unlike Present, every tool stays. Guides never print or export.
• Dragging snaps to the page's edges and centre (cyan guides), to every other item's edges and centres (coral), to the grid, and to a gap that matches a gap you already have — even whitespace is what makes a layout look deliberate. An equal-gap snap marks both distances: the one you are making, solid, and the one it matched, faint, each with the measurement on it in millimetres. Hold Alt while dragging to ignore snapping — but start the drag with Alt already down and you drag a clone instead, leaving the original where it was (snapping stays on there, since you pressed Alt to copy, not to ignore the guides). Drag off a ruler to lay down your own guide; drag it back onto the ruler to remove it. Guide box (B, in View beside Rulers and Grid — or the mm square where the two rulers meet, or right-click the page) draws an area to lay things out inside, like a title band or a figure well. Its edges and middles snap too. Drag a box edge to move that edge, and a corner to move two — the size is read out in millimetres of the real page while you drag. Take the small tab above the box to move the whole thing (holding Alt or Shift on any handle does the same), or drop it off the page to remove it. Guides (H) hides the ones you drew without deleting them — hidden, they neither draw nor snap. Every guide edit is undoable. Your guides are saved with the poster, and none of them — lines, boxes, grid or margin — is ever printed, exported, or shown while you present.
• Lines and arrows. Style sets solid, dashed, dotted, dash-dot or long dash. Ends picks the head at each end separately — triangle, stealth, open, diamond, round or bar, in four sizes — so a double-headed arrow is just picking a head at both. Route makes it straight, curved either way, or elbowed round a corner. Drop an arrow's endpoint onto an item and it attaches: the arrow then follows that item around, sliding along its border as either end moves.
• Shape fills. Fill offers none, a tint of the shape's own line colour, a solid colour, or a gradient — linear across, linear down, or radiating from the centre.
• Curved text. Paragraph ▾ → Curve bends a text box along an arc. Click into the box and it straightens while you type, then curves again when you click away — a caret cannot sit on a curve. A deeper curve needs a taller box, so the arch always stays inside it.
• Text in columns. Paragraph ▾ → Columns sets a text box's words in one, two or three columns, with a narrow, normal or wide gap between them; the words flow down one column and on into the next, and a box that grows with its words is as tall as its longest column. A curve and columns cannot both be on — choosing one turns the other off, and says so. Columns travel into a .pptx as PowerPoint's own, and come back in from one.
• Touch and pen. On a touchscreen or with a pen, the slide works as it does with the mouse: touch something to select it, drag it to move it, drag a handle to size or turn it, tap twice to type in a box, and hold a finger still for the menu a right-click opens. While presenting, swipe left for the next step and right for the last.
• Slide sorter. View → Slide sorter (or the Slide 3 of 14 readout at the foot of the page) shows every slide as a tile. Click to pick one, Ctrl+click to add or take out, Shift+click for a run, Ctrl+A for all; drag the picked slides to a new place (they join the section they land in); Duplicate (Ctrl+D), New section and Delete act on them, each one step for Ctrl+Z; a double-click or Enter opens a slide. While presenting it is the overview map: a click goes to the slide.
• A chart's numbers. Edit numbers… (in Chart options, or right-click the chart) opens them as a grid: the categories down the left, a series per column with its name at the head. Type in any cell and the chart on the slide changes as you type; + Row and + Series add, the × beside a row or at a column's head takes it out, Enter goes down a column and Tab across, and a block copied from a spreadsheet pastes across the cells. Apply keeps it, Cancel puts the chart back. Text shows the same numbers as comma-separated lines.
• Bullets and numbering. The ▾ beside List or Numbered opens the kinds of marker; Bullet options… or Numbering options… at its foot sets the marker's own colour and size (the words keep theirs), and where a numbered list starts. A .pptx keeps all of it, and the marker's kind, both ways.
• Find a shape. On Images → Shapes, the ▾ at the gallery's edge shows every shape with a search at the top: type circle, callout or arrow (a shape is found by the words people use for it, not only its name) and press Enter to draw with the first one found. The shapes you drew last lead the gallery.
• Icons. Images → Icons holds simple line icons — a tick, arrows, a warning, a lightbulb, people, charts, a calendar and more. Click one, then drag on the slide (it stays square), or just click the slide for one of the usual size. An icon is a shape: its line colour, weight, fill, rotation, flip and shadow are the shape's, it keeps its proportions when resized, and a .pptx carries it as a freeform PowerPoint can edit. Search finds them by the words people use (lightbulb, settings, refresh).
• Typefaces. The typeface list on Style draws every name in its own face, and the faces you used last are at the top under Recently used. Other… takes any font installed on this computer by name.
• Picture corrections. Select a picture, a figure or a flip book and use Object → Corrections ▾: brightness and contrast from −40% to +40%, colour saturation from none to double, and greyscale. They are settings over the picture, which is never altered, so Reset picture puts it back as it came. A .pptx keeps brightness, contrast and greyscale as PowerPoint's own; any other colour saturation stays here, and the export says so.
• Shadow. Object → Shadow ▾ puts a shadow under what you have selected: soft (just off the page), hard (a flat offset copy) or lifted (a card held up), or none. A drawn shape's shadow follows the shape and a picture's follows the picture; a text box with no fill shadows its words. It scales with the page, and a .pptx keeps it as PowerPoint's own shadow.
• Rotate and flip. Object → Rotate ▾ turns what you have selected a quarter turn either way, flips it left to right or top to bottom, straightens it, or turns it 15° at a time (drag the round grip above an object for any angle). A picture, a shape, a notebook figure, a flip book or a clip is mirrored; a text box's words never are. With several selected, their places mirror across the selection too. A .pptx keeps the flips as PowerPoint's own.
• Check accessibility. Review (on View) lists six checks; Accessibility goes through the whole deck for pictures and charts with no alt text, slides whose heading is not the first thing a screen reader reads, and words too faint against what is behind them (below 4.5:1, or 3:1 for large words). Each finding has its fix beside it — Write alt text…, Read the heading first, Use white words — and a click on the finding goes to it.
• Alt text. Select a picture, a figure from a notebook, a flip book, a clip or a chart and use Object → Alt text… (or right-click it) to say what it shows, for somebody who cannot see it: a screen reader reads it instead of the picture, and a .pptx carries it as PowerPoint's own description. Leave it empty to mark the picture decorative — a rule, a texture, a logo already named in the words — and it is skipped. The button's tooltip says what is written so far, and Review lists every picture and chart nobody has decided about.
• Lay these out like those. Select some objects, then Arrange ▾ → Lay these out like a group I click and click one member of a tidy row or column. What travels is the pattern — the axis it runs along, the edge or centre its members agree on, the rhythm of its gaps, and where the run starts — and nothing else. No size and no colour move, the counts need not match (three can be laid out like four), and the objects tidy up in their own band rather than jumping on top of the row you pointed at.
• Select two or more items for Arrange — agree on any edge or centre, or space three or more out with equal gaps. Ctrl+C / Ctrl+X / Ctrl+V copy, cut and paste, including between posters; pasting an image straight from your clipboard drops it on the page — even while you are typing in a box, from the builder screen, or when the picture was copied as part of a page. Paste knows three places to land: Ctrl+V nudges the copy clear of its original (or lands in the same place on another slide), Ctrl+Shift+V pastes in place — the exact coordinates it was copied from, which is how one caption ends up in the identical spot on twenty slides — and Ctrl+Alt+V pastes here, centred on the pointer. Right-click the page for all three, and for cut / copy / delete / duplicate of whatever is selected.
• Select by what things are. Right-click an object and the menu offers to take everything on the slide like it — every object of its type (every Caption, every figure, every shape), everything in its typeface, at its size, in its colour, with its fill or its line thickness. Each row says how many it will take before you click it, so the count is never a surprise; rows that would take only the thing you already have are not offered. Arrange ▾ → Select everything on this slide like this is the same list from the ribbon.
• Find & replace (Ctrl+F) has two halves. Text searches every text box, title and subtitle on every slide — not just the one on screen, which is all a browser's own find can ever see. Formatting is the other kind of replace: pick an object as an example, tick which parts of its description to match (its type, typeface, size, colour, fill, line thickness), tick which fields to change, and sweep this slide or the whole deck. It tells you how many objects on how many slides will change before you do it. Placed notebook cards are never rewritten by the text half — those words belong to the notebook.
• Locking comes in two strengths, on the right-click menu and on the Layers pane's lock button (which cycles through them). Lock position pins an item where it is and leaves everything else alone — select it, resize it, restyle it, type in it; it just will not drag or nudge. That is usually what a figure frame wants. Lock fully takes it off the canvas altogether: no clicking, no dragging, no typing. The Layers pane is the way back — or hold Alt while dragging a selection band, which sweeps up fully locked items too.
• The whole talk at once. The slide strip's view menu has an Overview map: every slide as a tile, grouped into its sections, with the current one ringed, optional ones labelled and anything the current version leaves out dimmed. Click a tile to go there; Esc closes it. It is a way of looking at the deck and moving around it — not a canvas you author on.
• The ribbon, arranged your way. There is no one right grouping, so there are nine. The always-visible Ribbon layouts button beside the tabs (or right-clicking the ribbon) opens a gallery of whole arrangements, headed by family. Some favour familiar ways of working — a classic menu bar, tabbed ribbon, compact options bar, inspector, design panel or workspace strip. Others are built on a single idea: Deck, slide, object if you want to know what a button will change before you click it, Sources tab if your figures come from a live notebook, Everything in one row if tabs themselves are the problem. A whole family differs by one decision only, so you can compare two arrangements alike in everything except where the table controls sit. Type in the filter to search names, families, and the group labels a layout would give you — crop finds the ones that give cropping a place of its own. Each card shows the tabs and groups it would give you. Clicking one applies it immediately and leaves the gallery open, so you can flick through. Nothing is ever lost: every layout holds the same controls, and Default puts them back exactly as they ship. This changes the ribbon arrangement; the New slide gallery on Home and Change layout on Design choose a template for a slide. Tuning individual buttons (right-click the ribbon) still works on top, and is remembered per layout.
• Have the content read. File → Export for review… writes the deck out as markdown — every slide's words in reading order, its figures with the notebook anchor each came from, captions, notes and timings — so a colleague or a language model can review what it says. Copy it or save it as a .md; junoview stays offline, the text is what travels. Beside it are four checks on the content: a figure nothing mentions, a caption tied to no figure, two spellings of one thing, and a slide with a lot on it. Each says what it counted, so you can disagree with it. (Before you print is the other list — that one is about ink and millimetres.) Private notes never go into the export.
• Every version, and what changed. Home → History lists a snapshot from every time you opened or saved this deck, and shows the one you pick beside the deck as it is now — slide by slide, marked changed, new, gone or moved. The small diagrams keep a long history quick; use Show full slides on any row for two real, read-only renders. Slides are paired by their own identity rather than by position, so inserting one does not report everything below it as different. Put back a single slide you destroyed, or the whole version; either way a snapshot of where you are now is taken first, so going back is itself undoable.
• A note to yourself, on the slide. Right-click anything you have drawn and pick Only me. It stays on your screen and in the presenter view, marked with a dashed amber edge so you can tell at a glance, and it is never drawn for the audience, never in an exported PDF and never in an exported .pptx. Like your speaker notes it is stored in the deck, so a deck file you hand to somebody contains it.
• Find a slide mid-talk. Press / while presenting and the overview map opens with a search box: type any words from a slide — its text, a table cell, a caption or your speaker notes — and the map narrows to the slides that say them. Enter goes to the first. The presenter view has the same search under the notes. A hit that is only in your notes says so, so you never jump expecting to see a word on the screen that is not there.
• Handouts and notes pages. File → Export PDF / print… asks what goes on each sheet: full-page slides, handouts of three slides a page with lines to write beside each, six a page, or notes pages — each slide above its speaker notes. Choose Save as PDF in the print dialog for a file. The last choice is remembered.
• The presenter view (Present → Presenter view, or N while presenting) shows this slide and the next, your notes (A− smaller / A+ larger sizes them, and the size is remembered), the talk's clock with Pause and Reset clock, the time now, where you are against your plan, Running late, Black screen for the room (B) and End show. Type a slide's number and Enter — in the show or in the presenter view — to go straight there, as in PowerPoint (a hidden slide too); the search under the notes takes a number as well.
• Rehearse, and the deck remembers. Every run of Present mode that reaches a second slide and lasts half a minute is recorded, per slide and per section. The Notes pane then tells you what you actually take beside the target you set, the presenter view shows “usually 3:42” under the clock, and the Rehearsals tab lists the lot with the sections totalled — a section is the unit you cut. The last twelve runs are kept, and they stay on this computer: sending someone your deck does not send them your rehearsal.
• Notes are markdown. **bold**, *italic*, `code`, # headings, bullets, numbers and quotes — plus links. [the paper](https://…) opens out; [the method](#7) jumps the talk to slide 7 from the presenter view; and {fig:id} prints that figure’s number, so a note that cites a figure stays right when the figures are renumbered. Bigger editor in the Notes pane puts the slide, the text and the rendered result side by side.
• One deck, several lengths. Right-click a slide to mark it optional, or to put it in a named custom show (a 20-minute talk, a 5-minute one) — make one from Present → Custom show ▾ → New custom show…. A slide that names no custom shows is in all of them, so an existing deck is already a complete "everything" show and turning one on excludes nothing until you say so. Pick which custom show to play, rename it or delete it from the same menu; deleting a custom show never deletes a slide, and a slide left in none of them returns to all of them. The strip labels slides optional or not shown for the custom show you picked. No second file, and nothing to keep in step.
• The presenting bar is folded away. While you present, only a faint Controls tab shows at the top edge. Move the pointer to the top of the screen to bring the bar (Stop presenting, Open now, Running late) for a moment, or click the tab to keep it until Hide. Esc stops presenting either way.
• Hide a slide. Present → Hide slide (or right-click it in the strip) keeps a slide in the deck, in its place and with its number, and the show goes straight past it — PowerPoint's Hide Slide. The strip strikes its number through and says hidden. It is left out of a PDF and a scrolling page; a .pptx keeps it, hidden there too, and a hidden slide in a .pptx you import stays hidden. That is not optional, which plays unless you are running late.
• Running late. Mid-talk, use Running late in the presentation bar (or press L) to skip every remaining optional slide from where you are now — the ones you have already shown are not the problem. It is deliberately not a version: you do not choose it beforehand, you reach for it at minute 34.
• Header & footer. Design → Header & footer puts the same line at the top or the foot of every page (and a watermark, and page numbers). Click Header or Footer to set its words, size, alignment and colour, or to leave it off the first slide. In the words, {name} is the presentation, {date} today's date and {date:long} the same written out — both update themselves; type a date instead to keep it fixed — and {n} / {N} this page and the total.
• A section is one thing. Right-click a section divider in the strip to move the whole run up or down, or duplicate every slide in it — the copy gets its own name, because two runs called "Methods" is a puzzle rather than a section. Header and footer text can now number within the section as well as within the deck: {n} and {N} are the deck's, and {sn}, {sN} and {sec} are the section's number, size and name — useful for a talk that runs in parts.
• One talk made of parts. Like \input in a LaTeX document: a section of a talk can show another presentation, which you write on its own — so a long talk is a handful of short ones and you never need them all open at once. File → Parts of this talk… (or the strip's Thumbnails menu) lists the talk as its parts, in order: Add a presentation you already have (with a preview of its slides), start a New part, or turn a section of this talk into a presentation of its own with Make it a part. A part's slides are locked in the talk and its divider says part; Edit opens the part, whose corner then says which talk it belongs to, one click back. Each time the talk opens it picks up whatever changed in its parts. If a part's slides were changed in the talk as well, nothing is overwritten until you press Update; Unlink keeps the slides as the talk's own, and a part that cannot be found keeps its slides as last copied. Presenting, PDF, .pptx and the saved file all see ordinary slides.
• Check what should match. Home → Style system → Check consistency groups text and figures that look as though they should use the same formatting. It never changes a slide by itself: each card names one possible difference and offers its own fix. It can also compare figure sizes, frame zoom and — for vector figures only — the typefaces read from SVG. A PNG carries no font name, so that finding has no automatic fix.
• Pictures keep their originals. A picture you add is shown on the page at a size the screen can actually use, and its full-size original is kept aside. Crop is a view over the whole picture rather than a cut — it always was — so cropping into one corner and exporting now gives you that corner at the resolution it was really photographed at. The full bytes are kept out of the deck's autosave, which is what used to fill the browser's storage and silently discard later edits.
• Where a figure came from. Right-click a frame and choose Where this came from: the notebook and cell that made it, every cell in its lineage (click one to go there), a way into the full plot trace, and whether the notebook has moved on since — which is answered by comparing the live card against the copy saved with the deck, not by guessing at dates. When it has, Take the notebook's version of this figure updates that one figure. Where it sits, its size and its crop live on the frame rather than in the snapshot, so none of them change. Junoview never runs your notebook: you re-run it, and this picks up what it wrote.
• Figure numbers that renumber themselves. A tied caption can carry {fig} — right-click it and choose Number it — and any text box can carry a reference to a figure. The number is never stored: it is worked out from where the figure sits in the deck, every time the page is drawn, in reading order. Move slide 9 above slide 4 and every number and every "see Figure 7" is already right. A reference to a figure you have deleted says so in words rather than showing a wrong number.
• A figure and its caption. Select a figure and a text box, right-click, and Make this the figure's caption. The caption then moves with the figure — dragged, nudged, tidied or laid out — and takes the figure's width when you resize it, which is the one dimension the two should share. It is not a group: the caption is still an ordinary text box you can select, restyle and edit on its own. The tie is one-way on purpose — the caption belongs to the figure, not the other way round.
• Pinned to a corner. Everything on a slide is already stored as a percentage of the page, which is why one deck renders at 16:9, on A4 and on an A0 poster. What that does not fix is the relationship between things when the page changes shape. Right-click an object and pin it to a corner or an edge: a footer pinned bottom left keeps its distance from the bottom, a page number pinned bottom right stays in its corner, a title pinned top, centred stays centred. Pinning never moves anything — it only changes what happens next. One pin per object, deliberately: this is not a constraint solver.
• Components. Select a group, right-click, and Make a component — a figure with its caption, a labelled callout, a footer block. Place it again from the same menu and every copy stays linked: change one and Push this look to it updates the rest. Each copy keeps its own words and its own figure, because only the arrangement and the look travel, never the content. Detach this one turns a copy back into ordinary objects. A component has one size — copies are placed, not stretched.
• Text that will not fit (AutoFit). Paragraph ▾ → Autofit (or the right-click menu) says what happens when the words outgrow their box, with PowerPoint's three answers. Grow the box is where every box starts: it grows with its words. Shrink the words remembers the height the box has now and asks the words to live inside it. What you chose is never rewritten — only what is drawn shrinks, so shortening the words later brings the size straight back. It stops before the text stops being readable, and if it runs out of room it says does not fit on the box rather than shrinking into illegibility. Fixed box keeps the height too, and words that overrun it are marked the same way. Both marks are editing aids: they never print, export or appear while you present. A .pptx keeps the choice as PowerPoint's own AutoFit, at the size the slide drew the words.
• The deck's own colours. A deck carries a small set of named colours — Accent, Warm, Lift, Calm, Ink, Quiet — plus its corner radius and the gap the arrange commands space things at. Give an object one from the Deck row at the top of any colour menu (Text colour, Box colour, Fill colour…) and it follows that colour: change it once with Design → Deck colours… and everything wearing it changes, because nothing kept a copy. A style set can bring its own palette with it, and a colour theme (Text → Style sets… → Colour themes) is exactly that. Untick Change the slide background too above the themes to keep the background your slides have and take only the theme's other colours.
• Maths in a text box. Type LaTeX between dollars anywhere in your words — $z = x - \bar{x}$ inside a sentence, or $$…$$ on its own for a display equation — and it renders as soon as you click away. Text → Equation opens a proper editor with a preview and a symbol palette if you would rather not type it blind. It stays maths through exports: the standalone HTML and the PDF both bake in the rendered formula, so they need no internet to show it.
• A ribbon of your own. Right-click the ribbon to untick buttons you never use and to move the ones you do within their group. It shows the tab you are looking at, buttons never move between tabs, and the row still never wraps — it compacts, exactly as it always did. Your layout is remembered for you, not for the deck, so it follows you from one presentation to the next. Put the ribbon back to normal undoes the lot.
• History of this object (right-click it) lists every state it has been through that undo still remembers, newest first, each saying what changed — moved, resized, colour, typeface. Put it back to this writes that state onto the object as it stands now: it is an ordinary edit, so Ctrl+Z undoes the putting-back itself and nothing else on the page moves.
• Tidy page on Design is the third of these checks, and asks whether the page is sloppy: objects nearly but not quite sharing an edge, gaps that are nearly but not quite even, and the same object pasted twice on top of itself. It reports first and never rearranges on its own — every fix is a button you press, and each one does that finding only. Things that are out by less than a hair are already aligned as far as anyone can see; things out by more than a little are a decision, not a slip, and it leaves both alone.
• Print check (on View) reads the page the way a print shop will: figures that will print soft, anything off the page or inside the 20mm margin, text without enough contrast to read, and empty frames. Click any finding to select the item it is about. File → Crop marks adds trim marks for the printer — the sheet grows 5mm on each side to hold them and the page keeps its exact size.
• Text is spell-checked while you edit (and only then, so nothing shows in Present or in an export). The font list covers the usual print families, and Other… takes any font installed on your computer.
• Editor shortcuts: Ctrl+Z / Ctrl+Shift+Z undo & redo, Ctrl+D duplicate (Alt-drag clones as you drag), Ctrl+Shift+D duplicate without its source (the copy points at no notebook cell, ready to aim at a different figure), Ctrl+G group, Del remove, arrow keys nudge (hold Shift for bigger steps). File → Export PDF saves the whole deck as a PDF (or prints it) at the page's true size — an A0 poster comes out as a real 841×1189mm page, ready for the print shop.
• Create slides, beside Present in a notebook, opens one clear choice panel before it makes anything: use the whole notebook, the section you are reading, or the cells you pinned or labelled, and choose whether its objects should arrive one at a time. Each section heading is a slide title and its markdown and figures are placed beneath it. It is always a new presentation: the one you were building is never replaced.
• Chart options (the Object tab, or right-click a chart) is the chart's own pane: stacked or 100% bars, a logarithmic value axis, a second axis on the right for the series you send there, data labels, axis titles, a trend line per series, a series drawn as a line over the bars, and each series' colour, name and visibility. Error bars and confidence bands come in through the numbers: a column Name ± is Name's error bar, Name lo and Name hi its band. All of it exports as real .pptx chart XML except the band.
• Images → Video / audio places a clip from your computer (so does dropping one on the slide). It plays in the show — click it, or tick Play when it arrives — and the Clip options pane on the Object tab trims it, picks its poster frame and sets controls, loop and mute. The clip is kept in this browser and in every self-contained save, so the deck plays with no file beside it, and it exports as a real media shape in the .pptx and plays in the standalone HTML.
• File → Import .pptx brings a .pptx IN as a new presentation (so does dropping one on the window, the launcher's New → Import a .pptx file, and a .pptx row in the Open dialog). Text stays editable — bold, colour and bullets inside a box included — shapes, lines, pictures, tables, charts, speaker notes, sections, links and builds come across, and whatever cannot is listed before the deck lands. The .pptx itself is never changed.
• File → Export .pptx writes a .pptx. Text stays editable in compatible presentation software, including Microsoft PowerPoint; figures and images come across as pictures, boxes and arrows become real shapes, placed tables become editable tables, and a placed chart leaves as an editable chart — numbers, series colours and legend, ready to restyle — and speaker notes land on each slide's Notes page. Builds travel: each click reveals the same objects it does here (rise and zoom arrive as fades — the click timing is exact). Links travel: a click action opens its page or jumps to its slide in the exported deck too, and so does a link on words. Cropped pictures keep their trim and their shape, and slide transitions come across at their own length (Move matching objects becomes PowerPoint's Morph). What does not travel: a crop you drew freehand, and equations (they arrive as plain text). Everything lost is counted and named when you export, not silently dropped — use Export PDF when any of it matters.
• Opened in Protected View? Nothing is wrong with the file: Windows marks everything a web browser downloads as coming from the internet, and PowerPoint opens those read-only until you press Enable Editing. To stop it for good, add your Downloads folder in PowerPoint's Trust Center under Trusted Locations, or right-click one file, Properties, and tick Unblock. The Junoview app on your computer writes the .pptx itself — into Downloads, beside its Open it and Show in folder — so its files open ready to edit.
• About .pptx compatibility. Junoview is independent and is not affiliated with, endorsed by, sponsored by, or approved by Microsoft. Microsoft and PowerPoint are trademarks of the Microsoft group of companies.
• Present plays full screen. Arrow keys / click ←/→ step through builds and slides; on slides with code, ↓ descends the code trail — every cell that made the figure, one per screen, in execution order — and ↑ climbs back out.

Saving

• The ▾ chevron beside Save (top bar) opens the save-to menu — it says where this presentation lives, and lets you change it:
  • Browser — kept in this browser, autosaving as you edit. Fine for a quick deck, but it is tied to this browser on this machine.
  • A file on your computer — pick a spot once and Junoview writes a .junoview file there. It remembers that file between visits, so Save (and autosave) go straight back to it — no re-picking, no downloads folder full of near-identical JSON.
  • This project (desktop app) — junoview_project.json next to where you launched it, along with your open tabs.
• See one before you open it. In File → Open a presentation… (Ctrl+K), point at a presentation (or tab to it) and its slides appear beside the list, drawn as the thumbnail strip draws them; Find keeps the ones whose name or slides hold your words, and lights those slides. On Home, pointing at a recent presentation shows the same preview in a card you can scroll. Look in a folder… lists the presentation files in a folder — the one Junoview saves into shows by itself — previewed and searchable before any is opened, and one opened from there saves back to its file.
• Each presentation remembers its own place, between visits too: one can live in a file and the next in this browser, and switching between them never moves either. Open a presentation… and Home's recent list say where each one is and when you last worked on it — talk.junoview.html · 2 h ago · 12 slides.
• A saved presentation is a .junoview.html file: a page your computer opens in a browser, with the presentation inside it. Double-click it and press Open in Junoview — a Junoview tab opens, asks once, and opens it for editing. Or drop the file onto a Junoview window: in Chrome and Edge that keeps it tied to the file, so Save writes back to it. Keep one next to its notebook as notebook.junoview.html and it loads itself the next time you open that notebook.
• File → Download a copy gives you a standalone .junoview to share; File → Open a .junoview file brings one back — later, or on another computer.
• Decks are robust to notebook edits: slides reference cells by stable ids, never position — re-upload an edited notebook and everything still resolves; a deleted cell just leaves an empty frame you can refill.

Install it as an app

There is no separate download, because there is nothing to download: the web version is the app. Use Install as an app on the welcome screen, or your browser’s own menu — Install Junoview, Install this site as an app, or Add to Home Screen. It then opens in its own window with no browser chrome, keeps working with no internet, and your notebooks still never leave your machine.

Run it locally

For local file browsing, project files and session restore, run it as a real program instead: pip install the repo and run junoview, or python -m junoview from a checkout. On Windows, double-clicking junoview.bat in the project folder does the same thing and finds a Python for you.

Support this project ♥

Junoview is free and open source, built and maintained in the open. If it saves you time, a Support contribution genuinely helps — and it funds where this is going:

• An online, hosted Junoview with accounts (think Overleaf, but for notebook figures + talks): save your documents and presentations to the cloud, pick up on any device, and share a link with collaborators — instead of juggling JSON files.
• Keeping the local + in-browser versions free forever, with regular improvements.

Use the button (top bar, far right) — it goes through Ko-fi. Thank you.

Licence and trademarks

Junoview is released under the Apache License 2.0. The web build loads Pyodide, MathJax and Plotly.js at run time from their own distribution networks; their licences are listed in the third-party notices.

Junoview is an independent project and is not affiliated with, endorsed by, sponsored by, or approved by Microsoft. Microsoft, PowerPoint, Excel, Calibri and Segoe are trademarks of the Microsoft group of companies. .pptx and .xlsx are file formats standardised as ECMA-376 / ISO/IEC 29500 (Office Open XML). Other product and company names mentioned here may be trademarks of their respective owners; naming them describes what Junoview reads, writes or resembles and implies no endorsement.