What is Diff Checker?

Diff Checker compares two pieces of text and highlights the differences at character, word, or line level. It offers both split (side-by-side) and unified views, making it easy to spot exactly what changed between two versions of a file, configuration, or document.

How to Use

Paste the original text into the left editor panel
Paste the modified text into the right editor panel
Choose your preferred diff mode (character, word, or line) and view style (split or unified)

Use Cases

Comparing two versions of source code to review changes before committing
Reviewing configuration file changes across environments (staging vs. production)
Checking document revisions to see what an editor or collaborator modified
Debugging unexpected output by comparing expected vs. actual results

Privacy & Security

All processing happens entirely in your browser. Your data is never sent to any server. You can verify this by checking the network tab in your browser's developer tools — you'll see zero outbound requests.