Compare two versions of any text and instantly see every addition and deletion highlighted word by word. Works entirely offline — your text never leaves your browser and is never sent to any server. Free, no sign-up, no file size limit.
This text comparison tool highlights exactly what was added and what was removed between two versions of any text, word by word. The comparison uses a longest common subsequence (LCS) algorithm and runs entirely in your browser with no internet connection required. It is suitable for comparing confidential documents, contracts, or any sensitive text because nothing is ever transmitted.
Most online diff tools send your text to a server to process it. This tool runs the comparison algorithm entirely in your browser using JavaScript. Once the page has loaded, it works with no internet connection — making it a safe choice for comparing sensitive documents, internal drafts, legal text, or anything you would rather not upload to a third-party server.
Yes. Once the page has loaded, all comparison runs locally in your browser with no internet connection required. It is safe to use with confidential or sensitive text.
No. The comparison runs entirely in JavaScript in your browser. Nothing you paste is ever transmitted or stored.
Word by word. The tool tokenizes both texts into words and whitespace, then finds differences using a longest common subsequence algorithm for a granular, readable result.
There is no hard limit. Very long texts may take a few seconds to process, and a warning is shown for large inputs.
Yes, but it is not syntax-aware. It treats code as plain text. For small snippets it works well; for large files a dedicated code diff tool may be more appropriate.
Yes. Because everything runs locally and nothing is transmitted, it is safe to use with confidential documents, contracts, or any sensitive text.
Additions are highlighted in green and deletions in red with strikethrough, shown inline so you can read the final text with changes in context.
Yes, completely free with no sign-up required and no usage limits.
Everything is compared locally in your browser — no text is ever sent to a server.