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.

How to use this Unified Diff Generator

Generate a unified diff patch from two text versions. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.