Understand any git diff
in plain English
Paste a git diff and get a plain-English summary or a ready-to-paste PR description — instantly. No signup.
Try an example
No API key? Demo summaries shown automaticallyHow it works
Copy any output from git diff, git show, or your pull request diff view and paste it into the box.
Enter your API key — it's saved only in your browser's localStorage and is never sent anywhere except Anthropic's API directly.
Claude reads the diff and returns a concise plain-English summary, or a structured PR description with title, bullet points, and test checklist — ready to paste into GitHub.
Common questions
Is this really free?
Yes. This tool has no backend and no subscription. You pay only for the Anthropic API calls you make with your own key — typically a fraction of a cent per diff.
Does my code leave my machine?
Your diff is sent directly from your browser to Anthropic's API using your own key. It never touches any server we control. No logs, no storage, no analytics on your code.
What git diff formats are supported?
Any standard unified diff format works: git diff, git diff HEAD~1, git show, GitHub/GitLab PR diffs. Diffs up to ~200k characters are supported.
How accurate are the summaries?
Claude understands code context well and produces accurate, concrete summaries. It uses the actual function and variable names from your diff, not generic descriptions. For very large or obfuscated diffs, consider splitting into smaller chunks.