Text & Data · Compare

Diff Checker

Compare two blocks of text and see exactly which lines were added or removed, side by side.

Original

Changed

Diff+2−1

  the quick brown fox
− jumps over
+ leaps over
  the lazy dog
+ and runs away

Frequently asked

Is this a line diff or a character diff?

It compares line by line using a longest-common-subsequence algorithm — ideal for code, config and prose.

Is my data uploaded anywhere?

No. This tool runs entirely as JavaScript in your browser — your input never leaves your device and nothing is logged.

Paste the original text on the left.

Paste the changed text on the right.

The line diff and add/remove counts update instantly.