Question 1

How are the two texts compared?

Accepted Answer

The tool compares them line by line using a longest-common-subsequence algorithm, the same technique behind most diff tools.

Question 2

What do the colors mean?

Accepted Answer

Green lines were added, red lines were removed, and a line removed immediately followed by an added one is grouped as changed.

Question 3

Does it compare word by word?

Accepted Answer

No, the current version compares whole lines; a single changed character marks the entire line as different.

Question 4

Is there a size limit?

Accepted Answer

Extremely large texts are rejected with a message, since the comparison algorithm's cost grows with both texts' combined line count.

Question 5

Is my text sent to a server?

Accepted Answer

No, the comparison runs entirely in your browser.

Diff Checker

How to use it