About Git Diff → HTML

Convert unified git diff output to syntax-highlighted HTML. Part of the DevTools Surf developer suite. Browse more tools in the Developer Utilities collection.

Use Cases

• Embed highlighted diffs in technical blog posts
• Create code review reports for compliance documentation
• Generate visual changelogs for release notes pages
• Include diff visualizations in presentation slides

Tips

• Paste a unified diff to generate syntax-highlighted HTML
• Use the output in code review documentation or blog posts
• Customize the color scheme to match your site theme

Fun Facts

• The unified diff format uses '+' for additions and '-' for deletions, with @@ hunk headers showing line number ranges from both files.
• GitHub renders over 2 billion diffs per day across pull requests, issues, and commit views.
• The first syntax-highlighting diff tool was likely xxdiff, created by Martin Blais in 2001, which offered a three-way visual merge.

FAQ

What gets highlighted?

Added lines (green), removed lines (red), unchanged context (gray), and file headers. Matches the GitHub PR view.

Does it do syntax highlighting?

Yes — the file extension determines the language. JS, TS, Python, Go, Rust, SQL all get proper highlighting inside the diff.

Can I embed in a blog post?

Yes — copy the HTML. Inline CSS styles; no external stylesheets needed. Pastes directly into any HTML document.

Word-level diff?

Optional — toggle 'word-level highlight' for within-line word changes. Useful for typo fixes vs full rewrites.