Back to Tools

Diff Checker

Compare two texts and find every difference

100% FreeRuns in your browserNo sign-up

About this tool

Paste two pieces of text and instantly see every difference highlighted line by line. Added lines show in green, removed lines in red, and unchanged lines in gray. Toggle inline mode for character-level highlighting within changed lines. Copy the unified diff output with one click.

Features

  • Side-by-side text input
  • Line-by-line diff with colors
  • Inline character-level highlighting
  • Line numbers for both sides
  • Copy unified diff output

Use cases

Comparing code versionsReviewing document changesChecking configuration differences

Share this tool

Help others discover it

HN

Create a free account to remove watermarks

Save your work, access the full creative suite, and export without watermarks.

Create Free Account

Frequently Asked Questions

Is Diff Checker really free?

Yes, 100% free with no hidden fees. You can use it as many times as you want, directly in your browser.

Do I need to create an account?

No account is required. However, creating a free aukimi account removes watermarks and lets you save your work.

Is my data safe?

Yes. All processing happens locally in your browser. Your files are never uploaded to our servers.

Can I use the results for commercial projects?

Absolutely. Everything you create with our free tools is yours to use however you like, including for commercial purposes.