Diff Checker
Compare two blocks of text and see additions and deletions highlighted.
About this tool
Whether you're reviewing a draft, comparing two versions of a document, or figuring out what actually changed between two pieces of text, eyeballing two blocks side by side is slow and error-prone. This tool computes a diff and highlights additions and deletions, with a choice between line-level (good for structured text) and word-level (good for prose) granularity.
Frequently asked questions
- Line diff versus word diff: which should I use?
- Line diff is generally better for structured text, where whole lines change together. Word diff is better for prose, where a single word changing shouldn't highlight the entire surrounding sentence as different.
- Does this send my text anywhere to compare it?
- No, the diff is computed entirely in your browser using a client-side diffing library. Neither block of text is sent to a server.
Related tools
🔒 All tools run entirely in your browser. Nothing you type is sent anywhere.