Processed locally in your browser
Text & Code Diff Checker
Compare two blocks of text or code side by side and see every line that changed.
Original
Modified
Diff
Paste text into both panes to see the differences.
Frequently asked questions
- Is my text uploaded anywhere?
- No. The comparison runs entirely in your browser using a local diff algorithm — nothing is sent to a server.
- What's the difference between Split and Unified view?
- Split shows the original and modified text side by side with matching lines aligned. Unified shows a single column, with removed lines marked "−" and added lines marked "+".
- What does Ignore whitespace do?
- It normalizes leading/trailing spaces and collapses repeated spaces before comparing, so lines that differ only in indentation or spacing are treated as unchanged.
- What algorithm does this use?
- A line-based longest common subsequence (LCS) algorithm — the same technique behind most git and text-diff tools.