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Everything runs in your browser. No servers, no logs, no risk.
Instant Results
Compare millions of characters in milliseconds with zero latency.
Copy Ready
One-click copy of the full diff output for sharing or saving.
Frequently Asked Questions
What is a diff checker? ▾
A diff checker compares two pieces of text and highlights the differences, showing additions in green and deletions in red — line by line or word by word.
Is my text stored or sent to a server? ▾
No. All comparisons happen entirely in your browser. Your text never leaves your device — there is no backend.
What is inline diff mode? ▾
Inline mode shows both original and changed text in a single panel, with added words highlighted in green and removed words in red — great for spotting small changes within a line.
Can I compare code with this tool? ▾
Yes! The diff checker works for any plain text, including source code, JSON, YAML, configuration files, Markdown, and prose.