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About Diff Viewer
Compare two blocks of text side by side or unified, down to individual characters, with no upload and no account.
What it does
Paste two versions of anything — code, configuration, prose, a log — and see what changed. Split view puts them side by side; unified view shows one stream in the style of a patch. Within a changed line, character-level highlighting shows the specific edit rather than marking the whole line as different.
When you'd use it
Checking what an automated formatter did, comparing a config between two environments, reviewing an edit to a document from someone who did not track changes, or working out why two supposedly identical files behave differently. Because nothing is uploaded, it is safe for production configuration.
Common questions
- Can it show differences within a line?
- Yes. Changed lines are highlighted down to the character, so a one-word edit does not look like a wholesale rewrite.
- Does it handle different line endings?
- Yes — Windows CRLF and Unix LF are recognised, so a file that differs only in line endings does not appear entirely changed.
- Is the text I paste sent anywhere?
- No. Everything happens in your browser — nothing you enter is uploaded, and the tool keeps working with no network connection.