Markdown Diff — Compare Two Markdown Documents

Paste two Markdown documents and instantly see what changed. Line-by-line diff with colour-coded additions and removals — no signup required.

What this tool does

Paste two Markdown documents — the original on the left, the modified version on the right — and click Compare Documents to see a colour-coded diff. Lines added in the modified version appear in green, removed lines in red, and unchanged context lines in grey.

When to use a Markdown diff

  • Documentation review — compare a draft against the current published version before merging
  • Content audits — spot exactly what changed between two revisions of a README, wiki page, or blog post
  • Translation review — identify which sections changed after a source-language update, so translators know what to re-translate
  • Changelog validation — confirm that only the intended sections were edited in a changelog file
  • Quick paste comparison — compare two versions without needing git access or a terminal

How the diff works

The comparison uses a Longest Common Subsequence (LCS) algorithm — the same technique used by git diff. Lines shared by both documents form the common subsequence; everything else is marked as an addition or removal. Toggle Hide unchanged lines to focus purely on what changed.

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