Question 1

How does the diff checker work?

Accepted Answer

Paste your original text on the left and modified text on the right, then click Compare. The tool uses an LCS (Longest Common Subsequence) algorithm to find differences line by line.

Question 2

What do the colors mean?

Accepted Answer

Green (+) indicates added lines (present in modified but not original). Red (-) indicates removed lines (present in original but not modified). Unchanged lines have no color.

Question 3

Can I compare code files?

Accepted Answer

Yes. The diff checker works with any text including source code, configuration files, JSON, XML, or plain text. It preserves whitespace and indentation.

Question 4

Is there a size limit?

Accepted Answer

No hard limit. Since everything runs in your browser, the only constraint is your device's memory. Very large texts may take a moment to process.

Question 5

Is my data safe?

Accepted Answer

Yes. All comparison happens entirely in your browser using JavaScript. Your text is never sent to any server.

Diff Checker

Diff Checker