Text Diff Checker
A free, browser-based converter. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Input
Original
Changed
Output
Enter values to see the result.
Runs entirely in your browser. Your input is not uploaded or stored.
How to use this calculator
- Paste the original text on the left and the changed text on the right.
- Read the line-by-line differences (+ added, − removed).
How it works
Uses a longest-common-subsequence diff to mark each line as unchanged, added or removed.
Worked example
One line changed. Changing 'b' to 'x' shows − b and + x with the rest unchanged.
Tips
- Runs entirely in your browser. Your input is not uploaded or stored.
Frequently asked questions
Line or character diff?
Line-by-line, which is the most readable for documents and code.
Privacy?
Runs entirely in your browser. Your input is not uploaded or stored.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.