How to offline github readme preview
- Step 1Open your README — Drop your local README.md into the upload pane.
- Step 2Render — The tool produces a self-contained HTML preview with GitHub's exact styling.
- Step 3Verify and iterate — Review the rendered output, fix issues in your editor, re-run until correct.
Frequently asked questions
Are GitHub-specific extensions like alerts supported?+
Standard GFM (tables, task lists, strikethrough) is fully supported. GitHub's newest alert syntax (NOTE/TIP/WARNING) is parsed as blockquotes.
Will relative image paths work?+
Relative paths display in the iframe preview only if served from the same origin. Use absolute URLs (raw.githubusercontent.com) for reliable preview.
Does it match the new GitHub UI?+
Yes — the Primer dark stylesheet matches GitHub's current default visual treatment.
Privacy first
All Markdown processing runs locally in your browser using JavaScript. No file is ever uploaded to JAD Apps servers — only metadata counters are saved for signed-in dashboard stats.