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Dev Tool

Diff Checker

Compare two texts or code files and see exactly what changed. Added, removed and modified lines highlighted instantly.

Original (A)0 lines
Modified (B)0 lines
Original (A)
Modified (B)
🟢
Added lines
Lines present in Modified (B) but not in Original (A) highlighted in green.
🔴
Removed lines
Lines present in Original (A) but removed in Modified (B) highlighted in red.
⚡
Instant comparison
Diffs are computed instantly in your browser — no file upload, no server.

Frequently Asked Questions

What types of content can I compare?
Any plain text — code files, configuration files, article drafts, CSV data, HTML, JSON, logs or any other text-based content.
Does this work for large files?
Yes. The diff algorithm runs in your browser and can handle thousands of lines. Performance depends on your device but most modern computers handle 10,000+ line comparisons in under a second.
Is my text sent to a server?
No. All comparison happens entirely in your browser using JavaScript. Your text never leaves your device.

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Done!