About Text Diff Checker
Compare two blocks of text and highlight the differences line by line — additions, deletions, and changes. Useful for reviewing edits, configs, and documents.
How to Use
- Paste the original text on one side.
- Paste the changed text on the other.
- Differences are highlighted automatically.
- Review additions and removals.
Why Use This Tool?
- Accurate — built on precise, well-tested mathematical formulas.
- Instant — all calculations happen client-side for zero latency.
- Private — no data is sent to any server; your information stays on your device.
- Free — no sign-up, no limits, no hidden costs.
Frequently Asked Questions
What do the highlight colours mean?
Typically added content is shown in green and removed content in red, so you can see at a glance what changed between the two versions.
Can it compare code?
Yes — it works on any plain text, including source code, JSON, config files, and prose. It compares the raw characters, not the syntax.
Is my text uploaded anywhere?
No. The comparison runs entirely in your browser, so you can safely diff private documents or code.