Markdown Preview, Live GitHub-Flavoured Markdown Editor Online
Type Markdown on the left and watch it render as clean, safe HTML on the right, instantly. Tables, task lists, code blocks and links all supported, a formatting toolbar handles the syntax, and everything runs client-side with nothing uploaded.
What is the markdown preview?
The Markdown Preview renders GitHub-Flavoured Markdown as clean, sanitised HTML side-by-side as you type, supporting tables, task lists, code blocks and links. A formatting toolbar inserts the syntax, and you can copy the output as HTML. Free and client-side, everything runs in the browser with nothing uploaded.
The GigAI Markdown Preview is a desktop-grade, split-pane Markdown editor that renders as you type. Paste a README, a pull-request comment, release notes or documentation and see exactly how GitHub-Flavoured Markdown (GFM) will look, headings, bold and italic, links, images, blockquotes, fenced code blocks, ordered and unordered lists, task-list checkboxes and full pipe tables. A formatting toolbar inserts the correct syntax around your selection, so you get bold, italic, headings, links, lists and inline code without memorising a single character of Markdown. What sets it apart from dillinger.io and StackEdit is trust and speed: the preview is produced by the battle-tested marked parser and then scrubbed with DOMPurify, so scripts, inline event handlers and dangerous URLs are stripped before anything reaches the page. You can safely preview Markdown pasted from anywhere. When you are done, copy the rendered HTML to drop into a CMS or email, copy the Markdown back out, or download either. Because rendering happens entirely in your browser, your drafts, notes and internal docs are never uploaded, stored or logged. Close the tab and it is gone.
- Difficulty:
- Easy
- Typical time:
- ~15s
- Processing:
- 100% browser processing
Last updated
How to use the markdown preview
- 1
Type, paste or import Markdown
Write in the left editor, paste from your clipboard, or drop a .md file onto it. Load the built-in sample to see every supported feature instantly.
- 2
Format with the toolbar
Select text and click Bold, Italic, Heading, Link, List or Code to wrap it in the correct Markdown, or just type the syntax yourself.
- 3
Watch the live preview
The right pane re-renders on every keystroke, showing the exact sanitised HTML, including tables, task lists and code blocks.
- 4
Copy or download
Copy the rendered HTML or the Markdown source, or download either as a file. Share a link that reopens the tool with your text pre-loaded.
What Markdown Preview includes
Live split-pane preview
Type Markdown on the left and a fully rendered HTML preview appears on the right on every keystroke. No 'render' button, no page reloads, no lag.
GitHub-Flavoured Markdown
Full GFM support: pipe tables, task-list checkboxes, fenced code blocks, autolinks, strikethrough, blockquotes and nested lists all render the way they do on GitHub.
Formatting toolbar
One-click bold, italic, heading, link, list and inline-code buttons wrap your current selection in the right syntax, so you never have to remember Markdown by hand.
Sanitised, XSS-safe output
Every preview is scrubbed with DOMPurify, stripping scripts, inline event handlers and dangerous URLs, so pasting Markdown from anywhere is always safe.
Copy Markdown or HTML
Copy the rendered HTML to paste into a CMS, email or template, or copy the Markdown source back out, plus download either as a file with one click.
100% in your browser
Parsing and rendering happen locally on your device. No README, draft or internal doc is ever uploaded, stored or logged.
Why use our markdown preview
See your README before you commit
Preview exactly how a README, issue or PR comment will render on GitHub, so you catch a broken table or unbalanced code fence before anyone else does.
Write Markdown without knowing Markdown
The formatting toolbar inserts correct syntax around your selection, making the tool approachable for writers and product folks, not just developers.
Safely preview untrusted content
Because the output is sanitised, you can paste Markdown from a form submission, comment or third party and preview it with no XSS risk.
Private by design
Everything runs locally, so drafts containing internal names, unreleased features or personal notes never leave your machine.
Built for the way you work
From quick one-off fixes to daily workflows, see how people put this tool to use.
- Open-source maintainer
Polish a README
Draft or edit a project README and confirm every badge, table and code block renders correctly before pushing it to the repository.
- Technical writer
Draft docs and release notes
Write documentation or changelog entries in Markdown, preview the formatting, then copy clean HTML into a docs site or CMS.
- Developer
Compose a PR or issue comment
Check that a long pull-request description with task lists, tables and code snippets will render the way you intend on GitHub or GitLab.
- Content / marketing
Turn Markdown into email or web HTML
Write in comfortable Markdown, then copy the sanitised HTML to drop straight into an email template or content-management field.
Supported formats
Accepts Markdown, MD and TXT, and produces HTML, all processed locally in your browser.
- Markdown
- MD
- TXT
- HTML
Frequently asked questions
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Use Markdown Preview in your code
The same engine runs behind the free API: send files, get signed download links back, and everything is deleted after the retention you choose. 1,000 tasks a month, no card.
Also runs as a task inside a job - chain it with the other engines. See the recipes.
curl -X POST https://api.gigai.tools/v1/jobs \
-H "Authorization: Bearer $GIGAI_API_KEY" \
-H "Content-Type: application/json" \
-d '{ "tasks": {
"in": { "operation": "import/url", "url": "https://example.com/input.md" },
"work": { "operation": "markdown-to-html", "input": ["in"] },
"out": { "operation": "export/url", "input": ["work"] }
} }'
# then poll until finished and follow the export URL:
curl https://api.gigai.tools/v1/jobs/JOB_ID/wait -H "Authorization: Bearer $GIGAI_API_KEY"Comparisons & guides
Go deeper on the concepts behind the markdown preview.
Common problems, solved
Hit a snag? Here are quick fixes for the issues people run into most.
My table isn't rendering as a table.
GFM tables need a header row and a separator row of dashes and pipes, like | A | B | on the first line and | --- | --- | on the second. Every row must have the same number of pipe-separated cells, and there must be a blank line before the table.
My raw HTML or <script> didn't appear.
The preview is sanitised with DOMPurify, so scripts, event handlers (onclick, etc.) and unsafe URLs are removed by design. Ordinary Markdown and safe inline HTML render fine. Anything that could execute code is intentionally stripped.
A single line break was ignored.
In standard GFM a single newline inside a paragraph does not force a line break. End a line with two spaces, or leave a blank line, to start a new paragraph. This matches how GitHub renders Markdown.
My code block shows the ``` fences as text.
Fenced code blocks need the opening and closing ``` on their own lines, with nothing else on those lines except an optional language after the opening fence. Make sure the closing fence isn't indented inside a list at a different level.
Get the most out of it
Select text first, then click a toolbar button to wrap just that selection in bold, italic, a link or inline code.
Use - [ ] and - [x] to create task-list checkboxes that render exactly like GitHub's.
Copy as HTML to paste formatted content into a CMS, email or template without re-styling it by hand.
End a line with two trailing spaces to force a line break inside a paragraph.
Drop a .md file onto the editor to load an existing README or doc instantly.
What's new
Recent updates and improvements to the markdown preview.
Initial release, live GFM preview with tables and task lists, formatting toolbar, sanitised HTML output, copy Markdown/HTML, drag-drop import and shareable links.
Added keyboard shortcuts for formatting and sample loading, an in-tool shortcuts helper, and a synced-scroll toggle between the editor and preview.
Keep exploring
Problems we solve
Definitions
From the blog
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Common tasks
Your privacy is built in
Your Markdown is parsed and rendered entirely in your browser and the resulting HTML is sanitised with DOMPurify before it is ever shown: scripts and dangerous attributes are stripped. Nothing is uploaded, stored or logged, so you can safely preview drafts containing internal names, secrets or personal notes. Close the tab and every trace is gone.
- Runs in your browser
- No uploads
- Nothing stored
Ready to try the markdown preview?
Free, private and instant. Markdown Preview runs right in your browser.