Text Diff Checker
Compare two texts and see added/removed/unchanged lines highlighted.
Overview
Compare two pieces of text side-by-side and instantly see every difference with this text diff checker. Additions are highlighted in green, deletions in red, and changes are clearly marked — perfect for comparing code versions, document drafts, or any two blocks of text.
Key Features
- Side-by-Side Comparison — Paste two texts and see them compared line by line with color-coded differences.
- Color-Coded Highlights — Green for additions, red for deletions, and yellow for modified text.
- Line Numbers — Each line is numbered for easy reference when discussing changes.
- Swap Texts — Quickly swap the left and right panels to reverse the comparison direction.
Tech Stack
Built with HTML, CSS, and JavaScript. Diff algorithm implemented in vanilla JS using a longest common subsequence approach for accurate change detection.
Problem it solves
Comparing document versions manually is error-prone and tedious. This diff tool highlights every change automatically with color coding.
How it was built
Built with HTML, CSS, and JavaScript. Longest common subsequence diff algorithm for accurate change detection.
Frequently Asked Questions
Is the Text Diff Checker completely free to use?
Yes, the Text Diff Checker is 100% free with no account required, no subscription, and no watermarks.
Does Text Diff Checker store any of my data or inputs?
No. All generation and calculations run client-side directly in your browser. None of your data or inputs are sent to or stored on external servers.
Can I use outputs from Text Diff Checker for commercial projects?
Yes, all results generated with this tool are free to use for both personal and commercial projects without attribution.