Create a patch file
Create a unified patch and verify that it reproduces the changed file byte for byte.
Choose two versions
Choose or paste the original and changed text. Reading and comparing happen on this device.
See what changed
Read the changes side by side or inline. Check encodings, line endings, hidden characters and ignored differences.
Save a copy
Save a verified patch, a masked HTML report or a merged file. The original files stay unchanged.
Patch limits
A patch contains real text, including secrets and ignored differences. UTF-16 and different encodings are refused; save a report instead.