Markdown Viewer Online
Quick answer
Open any .md file or paste Markdown and read it rendered — headings, GitHub-flavored tables, task lists and code blocks appear exactly as they will on GitHub or your static site. The viewer runs entirely in your browser on Windows, Mac and Linux: files are read locally, nothing is uploaded, and no account exists.
Last updated: October 26, 2026
Double-click a .md file and most operating systems open it as flat text: raw asterisks, hash marks and pipe tables with no formatting. That is the problem this viewer solves — drop the file in, and read the finished document. It is deliberately viewer-first rather than another editor: no toolbars, no formatting buttons, just the rendered output with the source one glance away. README files before a pull request, notes exported from note apps, AI-generated reports, project documentation — paste or open, read, then copy clean HTML or print to PDF if you need it.
Use the tool belowOpen a .md file or paste Markdown — the rendered document appears here instantly.
Nothing is uploaded: files are read by your browser and rendered on your device.
Markdown Viewer runs entirely in your browser, nothing you paste or type is uploaded to any server, and no account is needed.
Worked examples
Real input on the left, exactly what Markdown Viewer gives back on the right. Paste either side into the tool to re-create it.
1A README with a table and code block
Paste this into the viewer to see exactly what GitHub would render — alignment included.
## Setup
| Command | What it does |
| ------- | ------------ |
| `npm i` | Installs dependencies |
| `npm run dev` | Starts the dev server |
- [x] Install
- [ ] Configure `.env`
> Check the docs before deploying.h2 Setup
table
row: Command | What it does
row: npm i | Installs dependencies
row: npm run dev | Starts the dev server
[checked] Install
[unchecked] Configure .env
blockquote: Check the docs before deploying.Task lists render as real checkboxes and the pipe table keeps GitHub's column alignment — the two features raw Notepad mangles worst.
How do I open and view a Markdown file online?
- 1
Press Open .md file and pick your file — or drag it onto the editor panel. The file is read by your own browser via FileReader; it never touches a server.
- 2
Prefer pasting? Copy the Markdown source (from GitHub's Raw view, an email, a terminal) and drop it into the source pane. Rendering is instant.
- 3
Read the rendered document: GitHub-flavored tables, task lists, fenced code blocks and quotes all render the way GitHub or your static site generator will show them.
- 4
When you need to share it, copy the rendered HTML, save a standalone .html file, or press Print / PDF for a clean paper-friendly copy.
What this Markdown viewer does well
Viewer-first, not editor-first
Most online tools that call themselves viewers are editors with the toolbar hidden. This one is built around reading: the rendered document is the main surface, the source pane is compact, and there are no formatting buttons competing with the text.
Opens real files from your disk
The Open button and drag-and-drop both read .md, .markdown and .txt files locally with the browser's FileReader API. Ten-kilobyte README or a long technical report — the file is parsed on your device and never uploaded anywhere.
GitHub-flavored rendering you can trust
Tables with alignment, task lists, strikethrough, fenced code blocks and autolinks render via marked with GFM enabled — the same dialect GitHub uses. What you preview here is what your README will look like after the merge.
Sanitized output, by design
Markdown can carry raw HTML, and raw HTML from unknown files can carry scripts. Every rendered document passes through DOMPurify before display, so scripts, event handlers and unsafe URLs are stripped before anything reaches the page.
Share and export built in
Copy the rendered HTML for a CMS or email, download a standalone .html file, or print to PDF with a clean print stylesheet. Reading is the default job; sharing is one click, not a second tool.
Works the same on Windows, Mac and Linux
Because the viewer is a website, the "which app opens .md files" question disappears — Chrome, Edge, Firefox or Safari on any desktop OS gives the same rendering, and the panes stack on mobile for reading on a phone.
When you need a viewer instead of an editor
The reader case is surprisingly common. A teammate shares a spec as README.md and you want to read it, not edit it. A note app exported hundreds of .md files and you need to check one. An AI assistant answered with a long Markdown report full of tables. In all three, an editor is the wrong tool: it adds chrome, formatting buttons and side-by-side panes you did not ask for, and the thing you actually wanted — the rendered document — gets half the screen.
There is also the Windows-shaped version of the problem: Notepad renders .md as raw source, and the recommended fix is usually "install an editor or a VS Code extension". For a quick read, that is a lot of ceremony. This viewer is the browser equivalent of a double-click: open the tab, drop the file, read. If you then decide you do want to write or tweak, the Markdown editor on this site is one click away and keeps the same rendering engine, so the document looks identical in both.
How the rendering pipeline stays safe and accurate
Two libraries do the work, and their order matters. marked parses the Markdown source into HTML using GitHub-flavored rules (tables, task lists, fenced code). DOMPurify then sanitizes that HTML, removing script tags, inline event handlers and javascript: URLs before the document is inserted into the page. The combination is the standard defensive pair for third-party Markdown, because Markdown files regularly contain raw HTML — intentionally or not.
Accuracy comes from the same setup. marked with the gfm option renders tables with alignment, task lists with real checkboxes, and fenced code blocks exactly the way GitHub's renderer treats them. That is not an accident: GitHub's dialect is the de facto standard for READMEs, and previewing in any other dialect produces pleasant surprises at review time. Here, the preview is the dialect your readers will actually see.
Markdown viewer vs Markdown preview vs editor
The three names overlap, so here is the honest map. A preview (like the one inside our editor) renders as you type, built for the writing loop. A viewer like this one is for documents that already exist: the reading surface is primary, files open from disk, and editing is not the point. An editor is for creating and maintaining documents over time, with toolbars and auto-save.
In practice you will switch between the two depending on the job: viewer for reading specs, READMEs and exported notes; editor when you are the one writing. Both use the same GFM renderer and the same privacy model — client-side parsing, no uploads, no accounts — so documents render identically whichever surface they end up on.
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Frequently asked questions
How do I open a .md file on Windows without installing anything?
Use this viewer: press Open .md file (or drag the file onto the page) and the rendered document appears in your browser. No install, no association changes, works in Chrome, Edge and Firefox. Notepad will only show raw Markdown source, which is exactly what the viewer avoids.
Is my file uploaded to a server?
No. The file is read by your own browser with the FileReader API and rendered on your device. There is no upload endpoint and no account that could store it — close the tab and nothing remains. That makes it safe for internal specs and unpublished drafts.
Which Markdown features does the viewer support?
GitHub-flavored Markdown: headings, bold and italic, lists, task lists with checkboxes, tables with alignment, fenced code blocks, block quotes, links, images and inline code. Raw HTML inside the file is rendered only after DOMPurify strips scripts and unsafe attributes.
Can I read a GitHub README before cloning the repo?
Yes — open the file's Raw view on GitHub, copy the source, and paste it here for the same rendering GitHub uses. The viewer's GFM renderer matches GitHub's dialect for tables, task lists and code fences, so the preview matches what the repo page shows.
Does the viewer work on a phone?
Yes. The panes stack vertically on small screens, so you can open a .md attachment or paste text and read the rendered document comfortably. Printing and HTML export work from the mobile browser's share and print menus.
Can I edit the document after viewing it?
The viewer is intentionally read-focused, but the source pane is live: edit there and the rendering updates instantly. For real writing sessions — toolbars, auto-save, .md export — use the Markdown editor, which uses the identical rendering engine.