Text Diff
Compare two blocks of text and see exactly which lines changed.
Runs entirely in your browser. Nothing you type is uploaded.
About this tool
Paste an original and a changed version to get a line-by-line comparison marking added, removed and unchanged lines. The comparison uses a longest-common-subsequence match, so unchanged blocks stay aligned instead of shifting after an edit.
Questions & answers
- Does it compare word by word?
- It compares whole lines. A line with one changed word shows as one removed line and one added line.
- Is my text uploaded to compare it?
- No. The comparison runs in your browser, so both versions stay on your device.
- Does this tool send my data to a server?
- Runs entirely in your browser. Nothing you type is uploaded.
Related tools
Need the full version? DevToolbox goes much deeper on this topic.