What is Text Diff Checker?
Text Diff Checker compares two blocks of text or code line-by-line and character-by-character, highlighting additions (+), deletions (-), and modifications.
How to use Text Diff Checker
Paste original text on the left and modified text on the right. View the side-by-side or unified diff highlight output instantly.
Key features
- Side-by-side and unified diff views
- Color-coded insertion and deletion highlights
- 100% client-side operation
Common use cases
- Comparing code revisions, config files, and text drafts
Technical details & standards
Uses Myers diff algorithm to calculate edit scripts client-side.
Frequently asked questions
Is my text data sent to a server?
No. All diff comparisons run in local browser memory.
Is my data safe?
All processing happens entirely in your browser. Your data never leaves your device and is never sent to or stored on a server.
Does it work offline?
Yes. Once the page has loaded, most tools keep working without an internet connection.