diff-checker
Paste two versions of text, config, or code and see a line-by-line diff — additions, removals, and unchanged context. Everything stays in your browser.
client-side only
line-based diff
no signup
original
changed
// how this compares text
// when this is the right tool
- Comparing two versions of a config file, environment variable list, or SQL migration before applying one.
- Checking exactly what a teammate changed in a code snippet pasted over Slack, without pulling the branch locally.
- Reviewing generated output (e.g. a formatter or codemod result) against the original to sanity-check the change.
For anything larger than a quick check — a full file or a real pull request — your editor's built-in diff view or git diff will handle whitespace, renames, and large files far better than a browser textarea.
This runs a line-based diff (similar in spirit to what
git diffshows) — it finds the longest matching sequence of unchanged lines between the two versions, and treats everything else as added or removed. It's a whole-line comparison, not a character-by-character one, so a single-character change on a line marks that entire line as changed rather than highlighting just the character.