Online Text Diff Comparison Tool
Paste the original text and the new text to see the differences highlighted.
Compares word by word (not line by line) and highlights exactly what changed — useful for reviewing an edit, comparing two versions of a contract, or seeing what an AI rewrote in a text.
Processing happens entirely in your browser — neither text is ever sent to any server.
Frequently asked questions
Is the comparison by line or by word?
By word. Comparing by line misses a small change within the same paragraph; comparing by word shows exactly the part that changed, even within a single sentence.
Why is there a text size limit?
The comparison algorithm (the same principle behind the 'diff' tool programmers use) grows in complexity quickly with text size. Above the limit, the calculation would be too heavy to run directly in the browser.
Does this work for comparing source code?
It works, but it's optimized for regular prose. For comparing code, line-oriented diff tools (like the ones in version control) usually give a more readable result.