CEZAMText diff
Line and word level differences.
Compared in your browser: nothing is sent anywhere.
- 100% local — your data never leaves your browser
- Free, no usage limits
- No sign-up, no account
What this tool does
Paste two versions of a text: the tool compares them line by line (longest common subsequence, the same principle as git diff) and shows a unified view — added lines in green, removed lines in red, with line numbers from both versions. On replaced lines, the words that changed are highlighted individually.
Everything runs in your browser: no text is ever sent to a server and no account is needed. The “Copy diff” button produces a reusable unified diff with +, − and space prefixes.
Limitations
The comparison is exact: case, spaces and punctuation all count. A moved block shows up as removed from its old position and added at the new one — the algorithm does not detect moves as such.
Beyond a few thousand entirely different lines, the tool falls back to a simplified mode (everything removed, then everything added) to stay instant. A local change inside a large document is still diffed precisely.