Markdown Diff — Compare Two .md Files Online, Free

Compare two Markdown files side by side with GitHub-style line highlighting. Paste both versions, drop in .md files, and instantly see every addition, removal, and unchanged line — line numbers included. Free, no signup, no upload: both files stay 100% in your browser, ideal for reviewing PR diffs, NDA redlines, doc edits, and contract changes where you can't send drafts to a server.

Original (Left)

Modified (Right)

How to use Markdown Diff

  1. Upload, paste, or type your source content in the editor.
  2. Review formatting in preview and adjust options if needed.
  3. Download, copy, or export the result instantly.

Why use tinyMD for Markdown Diff

  • Side-by-side diff with GitHub-style line highlighting for added, removed, and unchanged lines
  • Line numbers and word-level highlighting so you spot every change at a glance
  • 100% client-side — both files stay in your browser, ideal for confidential drafts and NDAs
  • Paste, drop, or upload — works with any .md, .markdown, or plain text file
  • Zero signup, zero ads, and no rate limits

Frequently asked questions

How do I compare two Markdown files online?

Paste your original Markdown into the left panel and the updated version into the right panel. Differences are highlighted instantly: green for additions, red for removals, and gray for unchanged lines. You can also upload .md or .markdown files directly.

Is the Markdown diff tool free?

Yes — completely free, no signup, no ads. tinyMD's diff runs entirely in your browser, so we have no server cost to recoup.

Are my files uploaded to a server?

No. The diff runs 100% client-side in JavaScript. Neither file ever leaves your device, which makes this tool safe for confidential drafts, contracts, and pre-publication content.

Does it work like git diff for Markdown?

Visually, yes — the output mirrors what git diff or GitHub's PR review shows. The difference is you don't need git installed or a repo set up; just paste both versions and review.

Can I compare large Markdown files?

Yes. The diff handles documents up to roughly 1 MB comfortably. For very large files (book-length), expect a brief processing pause while your browser renders the line-by-line view.

Does it highlight changes within a line, or only whole-line changes?

Whole-line changes are highlighted by default. Modified lines appear as a removal + addition pair so you can see both states side by side.

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