Text Diff

About Text Diff

A text diff compares two versions of text and highlights the changes between them. Paste an original and a changed block and it shows a side-by-side, line-by-line diff — additions, deletions, and unchanged lines — using longest-common-subsequence matching, with optional ignore-case and ignore-whitespace. Compare code, config, or drafts privately in your browser, nothing uploaded.

Frequently asked questions

How do I compare two blocks of text?

Paste the original on the left and the changed version on the right. The diff updates instantly, highlighting added lines in green and removed lines in red, down to the changed words.

Is the comparison line-by-line or word-by-word?

Line-by-line for structure — ideal for code, config files, and drafts — with word-level highlighting inside changed lines so you see exactly what differs.

Can it ignore case or whitespace differences?

Yes. Toggle 'Ignore case' to treat 'Foo' and 'foo' as equal, and 'Ignore whitespace' to skip indentation and spacing changes.

Is my text uploaded to a server?

No. The diff is computed locally in your browser, so neither block is sent anywhere — safe for source code, contracts, and config.