Code Review Summary

Understand Any Pull Request Before You Review It

Q: How do I generate a summary of a GitHub pull request diff?

On GitHub, append '.diff' to any pull request URL (e.g. github.com/user/repo/pull/123.diff) to get the raw diff. Copy that output and paste it into AI Diff Summarizer. Within seconds you'll have a plain-English summary of every file changed in the PR, perfect for use as a pre-read before starting your review.

Get a plain-English overview of any PR in 5 seconds. Know the intent, scope, and risky areas before reading a single line of code — so your review is faster and more focused.

🔍 Summarize PR Diff Free →

Tip: On GitHub, append .diff to any PR URL to download the raw diff. For example: github.com/user/repo/pull/123.diff. Copy that output and paste it into AI Diff Summarizer.

How to get a code review summary

Get the PR diff

Append .diff to the GitHub PR URL, or run git diff main...your-branch locally. Copy the raw diff text.

Paste into AI Diff Summarizer

Select Summary mode (the default). Add your Anthropic API key once — it stays in your browser's local storage, never on a server.

Read the overview, then review

You get a concise breakdown: which files changed, what each group of changes does, and the overall intent of the PR. Start your review with the full picture already in mind.

Frequently asked questions

How can AI help with code review?

AI can summarize what a pull request does before you dive into individual files — helping reviewers understand intent and scope quickly. It highlights which files changed, what patterns were used, and flags areas that likely need close attention (security-sensitive paths, complex logic changes, schema migrations). AI Diff Summarizer does this by processing the raw git diff with Claude.

What is a code review summary?

A code review summary is a plain-English overview of a pull request — what changed, why, and what the reviewer should pay particular attention to. A good summary includes: the scope of the change (which components), the type of change (feature, bug fix, refactor), any risky or security-sensitive modifications, and what tests were added or should be checked.

How do I generate a summary of a GitHub pull request diff?

On GitHub, append .diff to any PR URL (e.g. github.com/user/repo/pull/123.diff) to get the raw diff. Copy that output and paste it into AI Diff Summarizer. Within seconds you'll have a plain-English summary of every file changed in the PR — perfect as a pre-read before starting your review.

Does the code reviewer see my source code?

No. Your diff goes directly from your browser to Anthropic's API using your own API key. Nothing passes through a third-party server. The tool has no backend — it is a static web page that calls the Anthropic API directly. Your code is never stored.