Rapier is a free online Markdown editor. Write on the formatted page or in the Markdown source, on your phone or computer; there is no split preview. The file stays plain Markdown. Open a .md file to read it formatted, or import Word or PDF. Free and open source (AGPL-3.0-only); no account, ads or tracking; works offline.
Free online Markdown editor
Headings, lists, checklists, tables, footnotes, callouts, syntax-colored code, LaTeX math and Mermaid diagrams, with find and replace, text-to-speech and undo. Paste cells from a spreadsheet and they become a Markdown table. PNG, JPEG, WebP, JPEG XL and SVG pictures live inside the Markdown file, and text wraps around their real shape. Rapier keeps a draft as you work, and Save writes a .md file.
Free online Markdown viewer
Tap ••• at the top right, then open, and pick a .md file; on Android, open it from your file manager. Headings, tables, checklists, code, math and Mermaid diagrams show formatted. Nothing is uploaded; it works offline. Edit in place, switch to the source, or turn on read only in settings.
Markdown to PDF
Paste or open your Markdown, tap ••• at the top right, then .pdf under export. The PDF is written on your device, nothing uploaded: searchable text, tables, code, math and pictures as they look on the page. The Markdown travels inside the PDF, so Rapier opens it again as the same file. Markdown to PDF
Markdown to Word
Tap ••• at the top right, then .docx under export, for an editable Word document with headings, lists, tables, code and pictures. Markdown to Word
Word to Markdown
Tap ••• at the top right, then open, and pick a .docx file. It becomes an editable Markdown page, pictures included, and Save writes the .md file. Word to Markdown
PDF to Markdown
Tap ••• at the top right, then open, and pick a .pdf file. Choose Editable text and it becomes Markdown you can edit, pictures included. PDF to Markdown
Compare text and documents
Paste two texts, or choose two Markdown, code, Word or PDF files, and see what changed, word by word. A moved paragraph shows as a move, and nothing is uploaded. Compare documents
Free diagram maker
Write Mermaid and the diagram is drawn as you type: flowcharts, sequence, class, state and ER diagrams, Gantt charts, mind maps and more. Save it as SVG or PNG, or put it in a document. Flowcharts draw at once; the other kinds use the free diagram plug-in, which downloads once. Free diagram maker
Other files
Rapier also opens text, code, TextPack and PDF (PDF import is a free plug-in), and exports plain text and a static offline web page. Share a .rapier.html file with the whole editor inside so someone can edit or comment offline and send it back. The Markdown converter turns many PDF, Word and HTML files into Markdown at once, or Markdown into Word, PDF or HTML.
Notes, drawing and painting
Notes are Markdown files with colors, pins, checklists, voice recordings, tags, history and search; import from Google Keep, Evernote, Notion, Obsidian and 15+ other apps. Draw freehand or build diagrams with connected arrows, kept as editable SVG inside your file. Paint with oil, pencil, marker and MyPaint brushes, or watercolor with flowing pigments on textured paper. The Gallery holds thousands of free ornaments, borders and decorative letters, the JPEG XL converter makes JXL pictures on your device, and the LaTeX equation editor draws equations for Word, SVG and PNG.
AI agents
An AI agent can edit with you live, and you see its changes and undo any of them. Connect Claude, ChatGPT, Grok Bot, Cursor or another MCP client to https://mcp.rapier.website/door/mcp with no account, or use WebMCP in the browser. See the agent guide.
Where it runs
In a browser, on Android (Google Play), Windows and Linux, or as one HTML file that you keep in a folder. The Android app has no internet permission.
Rapier needs no account signup and uses no analytics or advertising. It collects no personal information from anyone,
children included. Your files stay on your device until you save, share,
back up or sync them. Sync writes plain files to the storage you choose. You keep
or delete local files; Delete forever removes notes and their history.
The Android editor has no Internet permission. It records audio only when you press Record, into your
notes. Google Play handles purchases, reviews and optional plugin downloads under its policy.
Sharing a document through the hosted agent door (mcp.rapier.website) sends the content you choose there
for shared reading and editing. Its private workspace keeps the document, retained edit history, inspected
passages, presence, selections and tool records. Authorized connections and secret document references
control workspace access. Active use renews workspace expiry to 30 days; unchanged sync does not. Expired
workspaces are cleared on their next request or deletion alarm. In the editor, you can delete the workspace
or disconnect agents from that document. The door keeps creation and registration budget records for one
hour and tool invocation budget records for one minute. Your assistant's host handles the conversation under
its policy.
Essential cookies remember the browser that approved connected apps for up to 90 days, guard consent,
and authorize paired editors for up to 24 hours. OAuth access tokens expire after 15 minutes. Refresh grants
and client registrations expire after 90 days without renewal. You can revoke a connected app at
Connected apps.
Revoking a connection preserves your hosted documents; delete their workspaces to remove them.
Hosted exports keep an unchanged file copy. A download link lasts up to 24 hours within the workspace's
lifetime, and is revoked when you delete the workspace or disconnect agents. Expired copies are cleared on
the next workspace update or deletion.
Cloudflare serves the page and door and sees what web requests show.
terms
Rapier is free software: AGPL-3.0-only for the editor; MIT for the Markdown standard and embed helper.
Provided as is, without warranty where law allows. Keep your own copies. The door may change or close.
Jack Skipworth · hello@rapier.website · effective 15 October 2026
Rapier Notes keeps your notes on your device, as plain Markdown files shown as cards. Pin and color them, add checklists, pictures and voice notes, and go back to any earlier version. Import brings in Google Keep, Apple Notes, Evernote, Notion, Obsidian and more. There is no account. The Android app adds reminders and a home-screen widget.
Yes. Import your Google Keep notes from a Google Takeout export: text, checklists, pins and pictures become Markdown notes.
Where are my notes kept?
On your device, in your browser or the Android app. Nothing is uploaded unless you turn on sync to storage you own.
Is there an Android app?
Yes, Rapier on Google Play. It has no internet permission.
Is it free?
Yes. Rapier is free and open source, with no account, ads or tracking.
Every note is a Markdown file shown as a card. Import brings in Google Keep, Apple Notes, Evernote, Notion, Obsidian and Joplin. Sync keeps notes as plain files in your own cloud storage.
Tip. Back up the notes you care about. The Android app keeps notes outside Android's automatic backup.
Import notes from other apps
In Notes, tap Import and pick the app you are coming from, then the files it exported. Rapier reads them on your device and makes each one a Markdown note. Nothing already in your notes changes.
Import from Google Keep
Choose your Google Takeout zip, or all the files in its Keep folder.
Import from Obsidian
Your vault as a zip, or its .md files and pictures.
Import from Logseq
Your graph folder as a zip, or its pages.
Import from Roam Research
The JSON export.
Import from Bear
The Markdown or TextBundle export.
Import from TextBundle
A .textpack, or the bundle's files.
Import from Joplin
A .jex export, or the raw export's files.
Import from Notion
The Markdown & CSV export zip.
Import from Evernote
An .enex notebook export.
Import from Simplenote
The export zip.
Import from Standard Notes
A decrypted backup zip.
Import from Day One
The JSON export zip.
Import from Zoho Notebook
The HTML export.
Import from Craft
The Markdown or TextBundle export.
Import from UpNote
The Markdown or HTML export.
Import from Amplenote
The Markdown export.
Import from Nextcloud Notes
The notes folder as a zip; its folders become sections.
Import from Apple Notes
Notes exported as Markdown from the share sheet.
Import from Dropbox Paper
Docs exported as Markdown.
Import from OneNote
A page saved as a single file web page (.mht) or a Word file.
Import from Samsung Notes
Notes saved as text or Word files.
Free drawing app online
Rapier Draw opens a canvas in your browser. Draw with your finger on a phone, or with a mouse or a pen. Select a shape to move, resize, label or restyle it, or attach an arrow that moves with it. Drawings are SVG: sharp at any size and editable later.
Yes. Rapier is made for phones first: draw with your finger, and pinch to zoom.
Do I need to download anything?
No. Draw runs in your browser. There is also an Android app on Google Play.
Where does my drawing go?
Press Done and it goes into your document as an editable SVG. Save the document as one Markdown file, pictures inside.
Is it free?
Yes. Rapier is free and open source, with no account, ads or tracking.
Drawing
Draw with the brush on the formatting toolbar. Drawings are saved in the file as SVG: sharp at any size, editable forever.
Online watercolor painting
Overlapping watercolor washes painted in Rapier.
This page opens a watercolor canvas. Wet color spreads across textured paper, pigments blend, and washes dry with darker edges. Paint with a finger, a mouse or a pen.
Yes. Rapier is free and open source, with no account, ads or tracking.
Does it work on a phone?
Yes. Paint with your finger or a stylus. Watercolor needs WebGPU; without it, Rapier paints with Brushes.
Can I save my painting?
Yes. Press Done to download it as JPEG XL, PNG or layers (OpenRaster), or add it to your document as an editable drawing.
Paint watercolor online with Rapier. Blend pigments, lay transparent washes and let wet color spread across textured paper. Use a mouse, a finger or a pen. The editor is free, with no account or installation required.
Watercolor needs WebGPU; without it, Rapier paints with Brushes.
Start a watercolor painting
Rapier Watercolor opens Draw with watercolor selected. You can also choose Watercolor inside any drawing. Choose a brush and a pigment, set the brush size, and paint on the canvas. Change the water and paint load for a light wash or a stronger mark. Add another color while the first is wet to mix them on the paper.
Water, pigment and paper
Water continues moving after a stroke. Wet washes meet and spread; pigment settles into the paper's texture and gathers at drying edges. Control flow, bleed, edge darkening, granulation and drying to shape the result. Paper settings change how the wash behaves, while the canvas background stays separate from the paint.
Use the water tool to wet the paper and the lift tool to take pigment back out. A light wash leaves room for the next color; a drier brush brings out the paper's grain. Undo lets you return to an earlier stroke while you explore a mixture or composition.
Keep transparent, movable artwork
The painting is a transparent layer inside an editable drawing. Set the paint, then move or resize it alongside shapes, lettering and other pictures. The paper background is independent, so the painting can sit over a different canvas color or become part of an illustrated document.
Press Done to place the drawing in your document. Text and pictures travel together in one Markdown file, including the image bytes. Save that file, or keep the whole editor and document as an offline HTML page. Your work remains yours to reopen, revise and share.
Paint beside your writing
Add a watercolor sketch to a field journal, illustrate a garden plan, paint a study for a letter or make a picture for a note. Rapier Draw adds editable shapes, connected arrows and text. Rapier Notes keeps your writing and illustrations together as Markdown notes.
Free and offline
Painting runs on your device, with no account or ads. After the editor has loaded, you can keep working offline.
Free painting app online
This page opens a canvas with real brushes: oil, bristle, scumble, pencil and pen from MyPaint, and watercolor that flows. Paint with your finger, then smudge, erase and undo. Nothing to download or sign up for.
Yes. Rapier is free and open source, with no account, ads or tracking.
Do I need to download an app?
No. It runs in your browser. On Android you can also install Rapier from Google Play.
Can kids use it?
Yes. There are no ads, accounts or tracking.
Can I save my painting?
Yes. Press Done to download it as JPEG XL, PNG or layers (OpenRaster), or add it to your document.
Paint
Paint with a finger, a mouse or a pen: oil, pencil, marker and MyPaint brushes, or watercolor that spreads and dries on the paper. Smudge and blend what's already down.
Convert PNG, JPG, GIF and video to JPEG XL (JXL), free. Files are made on your device, offline; nothing is uploaded. Choose the quality: Lossless, High or Medium. Under Lossless a JPEG converts exactly: smaller, and the original restores byte for byte.
Choose or drop pictures: JPG, PNG, WebP, AVIF or any picture your browser opens.
Choose the quality: Lossless, High or Medium. Effort keeps the picture: more effort makes a smaller file and takes longer. Under Lossless a JPEG converts exactly.
Download each .jxl file, or all of them as one zip.
How to convert a video to animated JPEG XL
Choose or drop an MP4, WebM or MOV.
The first time, download JPEG XL complete: free, once, then offline.
Up to 30 frames a second, without sound. A long or large video is scaled down or cut, and its row says so.
Download the .jxl file.
How to convert a GIF to animated JXL
Choose or drop an animated GIF, APNG or animated WebP.
The first time, download JPEG XL complete: free, once, then offline.
Choose the quality: Lossless, or High or Medium for a smaller file. Frame timing is kept.
Download the .jxl file.
Questions
Is it free?
Yes. Rapier is free and open source, with no account, ads or tracking.
Is my picture uploaded?
No. Files are converted on your device.
Does it work offline?
Yes. The encoder is inside Rapier. Videos and animations need JPEG XL complete, a one-time download; after that they convert offline too.
Is JPEG XL lossless?
Lossless is. High and Medium are lossy and much smaller. A JPEG converted under Lossless restores byte for byte.
How much smaller is JPEG XL?
An exact JPEG: usually 10 to 20% smaller. A 710 KB PNG painting: 428 KB lossless, 73 KB at High, 35 KB at Medium.
What does it keep?
Transparency, 16-bit PNG (Lossless), color profiles such as Display P3 and Adobe RGB, and HDR PNGs (PQ or HLG). Video sound is dropped.
How many pictures can I convert?
Any number. Rapier converts a few at a time; Cancel stops it. If the device runs out of memory, finished files are kept.
Which browsers open JPEG XL?
Chrome 155, Firefox 158 and Safari 17 and later. Safari does not play animated JPEG XL. Any browser can make the files here.
How it works
The JPEG XL encoder is part of Rapier, which is one offline HTML file. Your browser reads each picture, or plays each video frame by frame, and the encoder writes the JPEG XL file on your device. Nothing is uploaded. A JPEG is carried into JPEG XL without decoding it, then restored and checked against the original before you download.
Why JPEG XL
In Lossless mode a JPEG converts to a smaller file and restores the exact original. Other pictures come out smaller at the same quality. JPEG XL also holds transparency, high dynamic range and animation.
How rapier-jxl compares
17% smaller files than libjxl and libvips at the same quality (effort 7, 2,560-pixel photos). 12% smaller uploads than libvips at the same quality (effort 3, 2,560-pixel photos). The upload encoder downloads 182 KB; libvips in the browser downloads 2.9 MB. Half the memory of libvips for a 12-megapixel upload. Measured against libjxl 0.12.0 and wasm-vips 0.0.19, same SSIMULACRA 2 score.
Use rapier-jxl in your site or app
rapier-jxl is the JPEG XL encoder inside Rapier: JavaScript and WebAssembly, WebGPU at high efforts, MIT licensed, no dependencies. It encodes lossless and lossy pictures and animations, carries a JPEG exactly, and keeps alpha and HDR. The upload encoder is about 182 KB gzipped; the full encoder about 294 KB. Run npm install rapier-jxl, then import {encode} from rapier-jxl/upload: encode(file) returns the JPEG XL bytes.
Paste two texts, or choose two files, and see what changed, word by word. Word documents and PDFs are read on your device, not uploaded. A paragraph that moved shows as one move, with any words changed inside it, not as a deletion and an insertion. Free, with no account or limits.
Paste the original text on the left, or the top on a phone.
Paste the changed text on the right.
Tap Compare. Step through the changes with the arrows at the top; close the comparison to change either text.
How to compare two Word documents
Choose or drop the original .docx on the first side.
Choose or drop the changed .docx on the second side.
Tap Compare. Each change shows on the page as the document draws it, old beside new, with the changed words marked.
Questions
Is it free?
Yes. Rapier is free and open source, with no account, ads or tracking.
Are my files uploaded?
No. Text, Word documents and PDFs are compared on your device. It works offline once the page has loaded.
Can I compare Word documents?
Yes. Choose two .docx files. Each is read as its formatted text, pictures included, and the changes show on the page, old beside new.
Can I compare PDF files?
Yes, PDFs with text. The first time, Rapier downloads its free PDF reader once. A scanned PDF has no text to compare.
Does it show moved text?
Yes. A paragraph that moved shows as one move, with any words changed inside it.
Does it compare code?
Yes. Paste code, or choose two code files, and the changed lines show with the changed words marked.
Can I edit the result?
Yes. Open either side in Rapier, a free Markdown editor, and keep writing.
How it works
Rapier compares words, not just lines, then groups the edits into changes a person reads: a replaced word, an added sentence, a moved paragraph. It runs inside Rapier, one offline HTML file. Your browser reads each file; nothing is sent anywhere.
Use rapier-diff in your site or app
rapier-diff is the comparison engine inside Rapier: plain JavaScript, MIT licensed, no dependencies. Run npm install rapier-diff, then import {diff} from rapier-diff: diff(before, after) returns the exact edits and the changes they make.
Turn PDF, Word and HTML files into Markdown ready for AI tools and LLMs, pictures kept inside the file, or turn Markdown into Word, PDF or a web page. Every file is converted on your device, offline: nothing is uploaded. Download the result, or edit it in Rapier first.
Download each .md file, or tap Edit to open it in Rapier.
How to convert Markdown to Word, PDF or HTML
Choose or drop .md files.
Choose Word, PDF or HTML under Convert to.
Download each .docx, .pdf or .html file.
Questions
Is it free?
Yes. Rapier is free and open source, with no account, ads or tracking.
Are my files uploaded?
No. Files are converted on your device, so private documents never reach a server or an AI service.
Can I give the Markdown to ChatGPT or Claude?
Yes. Markdown keeps headings, lists and tables as plain text, which AI tools and LLMs read well. Convert here, then paste or attach the .md file.
Does it work offline?
Yes. Word, HTML and Markdown convert offline. PDF to Markdown needs the free PDF reader, downloaded once; then it works offline too.
What happens to pictures?
Pictures from Word and PDF go inside the Markdown file in their own format, so one .md carries them. Markdown to Word, PDF or HTML keeps them as they look on the page.
Can I convert HTML to Markdown, or Markdown to HTML?
Yes. Drop an .html file and choose Markdown: headings, lists, tables, links and code become Markdown. Drop an .md file and choose HTML for a web page that opens offline.
LaTeX equation editor
Type LaTeX and see the equation as you type. Copy it into Word as an editable equation, paste it into Google Docs as a picture, or save it as SVG or PNG. It is drawn on your device: nothing is uploaded, and it works offline.
Type or paste your LaTeX, without dollar signs. The equation is drawn as you type.
Tap Download SVG for a sharp picture at any size, or Download PNG for a transparent picture.
How to put a LaTeX equation in Word
Type your LaTeX.
Tap Copy for Word.
Paste it into Word. It becomes an editable Word equation.
How to put a LaTeX equation in Google Docs
Type your LaTeX.
Tap Copy picture.
Paste it into Google Docs or Slides.
Questions
Is it free?
Yes. Rapier is free and open source, with no account, ads or tracking.
Is my equation uploaded?
No. Rapier Math draws it in your browser.
Does it work offline?
Yes, once the page has loaded. Add it to your home screen to open it like an app, or keep the whole editor as one HTML file.
Which LaTeX does it know?
LaTeX math: fractions, roots, sums, integrals, matrices, cases, aligned equations, accents, Greek letters, blackboard bold and chemistry with \ce.
What if I mistype a command?
The equation editor says what is wrong, and for a misspelled command such as \farc it offers the right one, \frac.
Can I write a whole document with equations?
Yes. Tap Open in Rapier: the equation opens in the editor, and the document exports to Word with editable equations, or to PDF.
How it works
Rapier Math is part of Rapier, which is one offline HTML file. It turns LaTeX into SVG with the Latin Modern font inside, so the equation looks the same everywhere and stays sharp at any size. For Word it writes MathML, which Word turns into its own equation.
Use rapier-math in your site or app
rapier-math is the math renderer inside Rapier: TeX to SVG, MIT licensed (its Latin Modern font under the GUST Font License), no dependencies. It draws offline and at once, writes MathML, and plugs into markdown-it and rehype. Run npm install rapier-math, then import {render} from rapier-math: render(tex).svg is the picture.
Drop .md files and download each one as a PDF. Rapier writes the PDF on your device: nothing is uploaded. The text stays searchable, and the Markdown travels inside the PDF, so Rapier can open it again as the same Markdown.
Download each PDF, or tap Edit to change the Markdown in Rapier first.
The PDF has searchable text and the Markdown inside it.
Questions
Is it free?
Yes. Rapier is free and open source, with no account, ads or tracking.
Is my file uploaded?
No. Rapier works in your browser. Local editing uploads nothing.
Can I add a page break?
Yes. Tap Edit, then + on the bar under the text, then Line.
Do tables, code and math come through?
Yes, with pictures, drawings and diagrams, as they look on the page.
Markdown to Word
Drop .md files and download each one as an editable Word document, with headings, lists, tables, code and pictures. Rapier writes the .docx on your device: nothing is uploaded.
Download each .docx file, or tap Edit to change the Markdown in Rapier first.
The .docx opens in Word as an editable document.
Questions
Is it free?
Yes. Rapier is free and open source, with no account, ads or tracking.
Is my file uploaded?
No. Rapier works in your browser. Local editing uploads nothing.
Can I go back from Word to Markdown?
Yes. Drop the .docx and choose Markdown. A Word file Rapier made gives back the same Markdown.
Word to Markdown
Convert Word documents to Markdown ready for AI tools and LLMs: headings, lists, tables, links and pictures, the pictures inside the .md file. Rapier reads the Word document on your device, offline: nothing is uploaded.
Choose or drop .docx files. Convert to is on Markdown.
Download each .md file, with the pictures inside it.
Or tap Edit to open it in Rapier as an editable Markdown page.
Questions
Is it free?
Yes. Rapier is free and open source, with no account, ads or tracking.
Is my document uploaded?
No. Rapier works in your browser. Local editing uploads nothing.
Does it keep tables and pictures?
Yes. Tables become Markdown tables, or HTML where cells are merged, and pictures go inside the .md file.
Can I also convert a PDF?
Yes. Drop a PDF too. PDF reading is a free plug-in, downloaded once.
PDF to Markdown
Convert PDF files to Markdown ready for AI tools and LLMs, with their pictures. Rapier reads the PDF on your device, offline: nothing is uploaded, so a private PDF never reaches a server. Check the reading order, or tap Edit to fix it in Rapier.
Choose or drop .pdf files. Convert to is on Markdown.
The first time, Rapier downloads its free PDF reader once.
Download each .md file, or tap Edit to check the reading order in Rapier.
Questions
Is it free?
Yes. Rapier is free and open source, with no account, ads or tracking.
Is my PDF uploaded?
No. The PDF reader runs in your browser.
Does it keep the pictures?
Yes. Pictures go inside the Markdown file.
Does a PDF made in Rapier come back exactly?
Yes. A PDF Rapier exports carries its Markdown, and converting it gives back the same file.
Free diagram maker
Write Mermaid and the diagram is drawn as you type: flowcharts, sequence, class, state and ER diagrams, Gantt charts, mind maps and more. Save it as SVG or PNG, copy it as Markdown, or open it in the editor and export the document as PDF or Word. Rather move boxes by hand? Draw makes diagrams with arrows that stay attached. It all runs on your device: nothing is uploaded, and there is no sign-up.
Pick an example, such as Flowchart or Sequence, or paste your Mermaid.
Change the words and the drawing follows as you type.
Tap SVG or PNG to download it, or Copy Markdown for a mermaid block.
How to convert Mermaid to SVG or PNG
Paste your Mermaid diagram.
Tap SVG for a picture that stays sharp at any size, or PNG for one at twice its size.
The file is made on your device.
How to draw a flowchart by hand
Tap Draw by hand.
Draw boxes and join them with arrows. An arrow stays attached when you move a box.
Tap Done to put the drawing in your document, kept as editable SVG.
Questions
Is it free?
Yes. Rapier is free and open source, with no account, ads or tracking.
Is my diagram uploaded?
No. Diagrams are drawn on your device. Nothing is sent anywhere, and there is no sign-up.
Does it work offline?
Yes. Flowcharts draw at once. Other kinds use the free diagram plug-in, which downloads once and then works offline.
Which diagrams can I make?
Flowcharts, sequence, class, state and ER diagrams, Gantt charts, pie charts, mind maps, timelines, user journeys, Git graphs, quadrant charts, XY charts, Sankey diagrams, Kanban boards and more: Mermaid syntax.
Can I export Mermaid to SVG or PNG?
Yes. SVG keeps the diagram sharp at any size, with its fonts inside. PNG is twice the drawn size, on white.
Can I use it on my phone?
Yes. It is made for phones first, and works the same on a computer.
How it works
Rapier is one offline HTML file. Flowcharts are drawn by Rapier itself; the other kinds by Pele, an MIT Mermaid renderer, in Rapier's plug-in. Both run in your browser, so your diagram never leaves your device.
Put diagrams in your site or app
rapier-embed puts the Rapier editor, diagrams included, in your web app. It runs from your own copy and saves to your storage.
