Unified Diff Generator

Create a standard-style line patch with ---/+++ headers and a complete hunk without uploading files.

Original text

Modified text

Original filename

Modified filename

Comparison runs locally in your browser. Interactive diff uses a bounded token count to avoid locking the page on extremely large inputs.

Patch export & round-trip verification

Generate a unified patch with configurable context, verify that applying the patch reconstructs the modified text, and download the .patch file.

Context lines

—Added lines

—Removed lines

—Hunks

—Round-trip

Context hunks instead of one whole-file pseudo-hunk

Unified output now groups nearby edits into standard-style context hunks, exposes the context-line count, keeps filenames explicit, and supports copy/download only for the current inputs.