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Markdown Diff Viewer - Online Compare & Highlight Markdown

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Markdown Diff Viewer

Compare two Markdown documents side-by-side or in unified view – instant, private, no uploads.

Your diff will appear here after comparison.

Your diff will appear here after comparison.

Frequently Asked Questions

It's a tool that compares two Markdown texts and highlights the differences line-by-line, just like a code diff tool. You can see exactly what was added, removed, or changed between versions.

We use a line-based Longest Common Subsequence (LCS) algorithm running entirely in your browser. No data is sent to any server – everything stays private on your device.

Side by Side: Two columns show the original and new Markdown aligned. Deleted lines appear in red, added lines in green.
Unified Diff: A single column similar to git diff format, with lines prefixed by - (removed) and + (added).

Absolutely. This tool runs 100% client-side. Your Markdown content never leaves your browser. We do not store, track, or transmit any text you input.

This diff viewer compares the raw Markdown source. For a rendered preview, you can copy the text into a dedicated Markdown preview tool. We focus on source-level differences because that's the most precise way to track changes.

The diff algorithm works best for files with up to a few thousand lines. For extremely large documents, performance may slow slightly, but our optimized LCS implementation handles typical READMEs, blog posts, and documentation without any issue.

Yes, all Markdown elements – including image syntax, links, code blocks, and tables – are compared as text. Any change in the raw Markdown will be highlighted.
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