Diff Checker
Compare text, code & JSON side by side
Paste text on both sides and click Compare to see differences
Or click Sample to load example data
Frequently Asked Questions
Common questions about Diff Checker
Paste the original text on the left and the modified text on the right. The tool instantly highlights additions, deletions, and modifications with color coding. Green means added, red means removed.
Yes. The diff checker works with any plain text including JavaScript, Python, Java, SQL, HTML, CSS, JSON, YAML, and more. It compares text character by character regardless of the language.
Side-by-side mode shows the original and modified text in two columns, making it easy to see what changed at each line. Inline mode merges both into a single column with additions and deletions marked — useful for reviewing on smaller screens.
Yes. The comparison runs entirely in your browser. No text is uploaded to any server. Your code never leaves your machine, making it safe for proprietary or sensitive content.