Developer tools
Text Diff

Text diff checker

Paste an original and a modified version — config files, API responses, contracts, code — and see exactly what changed. Because the comparison runs on your device, it is safe for text you would never paste into an online diff site.

Open Text Diff — free Get the Windows app

Free in your browser — no sign-up. Install from the Microsoft Store to use it offline on Windows 10 and 11.

How to use it

Open Text Diff and paste the original text on the left and the modified text on the right, or open a file into each side.
Press Compare.
Review the highlighted additions and removals, then copy the diff if you need it.

Example

Original → modified

port: 8080
host: localhost
debug: true
timeout: 30

Diff

  port: 8080
- host: localhost
+ host: 0.0.0.0
- debug: true
+ debug: false
  timeout: 30

Features

Line-by-line comparison with changes highlighted inside each line.
Open files into either side instead of pasting.
Copy the diff to share it in a ticket or pull request.
Ignore whitespace to hide indentation-only changes. PRO

Frequently asked questions

Is my text uploaded?

No. Both texts stay on your device, which makes CodeForge suitable for credentials, logs and private documents.

Can I compare two JSON files?

Yes. For the cleanest result, format both with the JSON Formatter and use Sort keys A–Z first, so only real changes show up.

Is it free?

Yes. Comparing texts and files is free. Ignoring whitespace is a Pro option.

One workspace for all of it

Text Diff is one of 18 developer tools in CodeForge — alongside a JSON formatter, JWT decoder, regex tester, UUID and hash generators, and more. Press Ctrl+K to jump to any of them.