Compare texts line by line

Compare two versions to see line additions, removals and unchanged text.

Enter both text versions to compare them.

How to read the diff

Lines prefixed with “+ ” were added, lines prefixed with “- ” were removed, and lines prefixed with two spaces are unchanged.

Each text can contain up to 1,000 lines. Line endings are normalized; line content is compared exactly.
The comparison uses a longest-common-subsequence diff. If multiple alignments are possible, the tool chooses a deterministic one.
The result shows line changes; it does not judge whether the edits are correct or equivalent.
Both texts are processed in your browser and are not sent to the server. Avoid pasting sensitive content on shared devices.

Does it compare words inside a changed line?

No. It matches whole lines. If one line changes, the old line is marked removed and the new line added.

Are spaces and capitalization ignored?

No. Lines must match exactly to be marked unchanged.

What is the line limit?

Each version can contain up to 1,000 lines.

Input is processed locally and is not uploaded.