Free · Preview a patched file

Patch Applier

Apply a unified patch to one text file and preview the finished file before you save it.

  • Instant results
  • Private in your browser
  • No signup or limits

Apply one patch to one file

Preview the new file before you copy or download it.

Match strength
Source file5 lines
Unified patch10 lines
Patched file The patch fits this source.
name=Bookify
plan=free
file_limit=25
private=true
format=diff

Three simple steps

How to use it

  1. Paste or open the source file and its patch.
  2. Start with Exact matching, then allow a small mismatch only if needed.
  3. Check the finished text before you copy or download it.

Your data stays on this device

These tools run in your browser. Bookify does not upload, store, or inspect the values you enter. Close the tab and the working data is gone.