Does this handle large files?

Yes. The diff algorithm runs efficiently in your browser and can handle files with thousands of lines. For very large comparisons, results are paginated for readability.

Can I ignore whitespace differences?

Yes. You can toggle whitespace-insensitive mode to focus on meaningful content changes and ignore differences in indentation or trailing spaces.

Absolutely. Both texts are compared locally in your browser. Nothing is sent to any server, making it safe for proprietary code and confidential documents.

Diff Checker Online Free

Paste two blocks of text and instantly see every addition, deletion and change highlighted side by side. This free diff tool runs entirely in your browser, making it safe to compare sensitive code, configs and documents.

Open Diff Checker

How It Works

Text A:                    Text B:
  server:                  server:
    port: 8080               port: 3000       ← changed
    host: localhost           host: 0.0.0.0    ← changed
    debug: true               debug: false     ← changed
                              cors: true       ← added

Common Use Cases

Comparing configuration files across environments
Reviewing code changes before committing
Checking API response differences between versions
Verifying document edits and revisions

Frequently Asked Questions

Does this handle large files?: Yes. The diff algorithm runs efficiently in your browser and can handle files with thousands of lines. For very large comparisons, results are paginated for readability.
Can I ignore whitespace differences?: Yes. You can toggle whitespace-insensitive mode to focus on meaningful content changes and ignore differences in indentation or trailing spaces.
Is my data private?: Absolutely. Both texts are compared locally in your browser. Nothing is sent to any server, making it safe for proprietary code and confidential documents.