Text Diff Checker
Compare two texts and see exactly what was added, removed or kept.
About the Text Diff Checker
Paste the original on the left and the new version on the right to get a line-by-line comparison with additions in green and deletions in red, plus a similarity percentage.
Options let you ignore case or leading and trailing spaces, and hide unchanged lines so only the differences remain — useful when comparing two versions of a contract, a config file or an article draft.
Frequently asked questions
Is my text uploaded?
No. The comparison runs in your browser, so confidential drafts and code stay on your device.
How big can the texts be?
Comfortably a few thousand lines each. Beyond that the comparison gets slow and the tool will tell you.
Related tools
All Developer →SQL Formatter
Format a messy SQL query into readable, indented lines.
URL Encoder / Decoder
Percent-encode or decode URLs and query string components.
CSS, JS & HTML Minifier
Strip comments and whitespace to make your code files smaller.
QR Code Generator
Create a downloadable QR code for a link, text, Wi-Fi, phone number or email.
Cron Expression Generator
Translate a cron schedule into plain English and see its next run times.
UUID Generator
Generate cryptographically random UUID v4 identifiers in bulk.