Compare two texts and highlight what changed, line by line. 100% free, no sign-up — nothing ever leaves this browser tab.
Text Diff Checker compares two blocks of text side by side and highlights exactly what was added, removed, or changed between them — line by line, right in your browser.
Spotting the difference between two versions of a document, contract, or piece of code by eye is slow and error-prone. This tool does the comparison for you and highlights the changes clearly, so you can see exactly what's different in seconds.
No installs, no accounts — just your browser doing the work.
Scroll up (or tap the button above) to load the tool instantly — no account or install needed.
Add your file, text, or numbers into the tool above.
Sensible defaults are already selected — tweak anything you need.
Your result is generated locally and ready in seconds — no waiting room.
Added, removed, and unchanged lines are clearly color-coded.
Both texts stay in this browser tab and are never uploaded.
The comparison runs the moment you paste your text.
Because Text Diff Checker runs locally, teams handling sensitive data — finance, HR, legal, operations — can use it without the compliance questions that come with uploading documents to a third-party server.
Comparison is done line by line, which is the clearest way to spot changes in most documents.
Yes, though a dedicated code-diff tool may give more detail for large codebases.
No. Text Diff Checker runs entirely in your browser.