What diff format does this expect?

Standard unified diff format — the output of `git diff`, `git format-patch`, and most version control systems and code review tools use this same format.

Does this apply the patch to any files?

No — this only visualizes the diff content for reading; it doesn't apply changes to any actual files. Use `git apply` or your version control tool to actually apply a patch.

Can I view a multi-file patch?

Yes — file header lines (+++ and ---) are highlighted separately, making it easy to see where one file's changes end and the next file's changes begin in a multi-file patch.

Is my patch content sent anywhere?

No — the entire view is rendered in your browser. Nothing you paste or upload is sent to a server.

Free Online Git Patch/Diff File Viewer

Features

Runs entirely in your browser
Privacy-first — your data is never uploaded
Real-time, instant results
100% free, no sign-up required
Works on desktop, tablet, and mobile
No installation needed

Who uses this tool?

Software engineersWeb developersAPI testersDevOps engineersStudents

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About Git Patch/Diff File Viewer

A raw .patch or .diff file is plain text, but reading it that way makes it hard to quickly tell what was added versus removed — the +/- prefixes are there, but without color they blend together in a wall of monospace text.

This tool color-codes a patch or diff file line by line: added lines in green, removed lines in red, hunk headers (the @@ markers showing line numbers) in blue, and file headers bolded — the same visual convention used by Git and GitHub's own diff views — plus a summary count of total lines added and removed.

This works with standard unified diff format, the output of `git diff`, `git format-patch`, and most version control and code review tools, since that format is the de facto standard for representing line-based changes.

How it works

Paste or upload the patch file. Paste the diff text directly, or upload a .patch or .diff file.
Review the color-coded view. Added, removed, and header lines are visually distinguished.
Check the summary count. See the total lines added and removed at a glance.

Examples

Simple diff

Input

-const x = 1;
+const x = 2;

Output

The removed line shown in red, the added line shown in green.