Question 1

How does the diff work?

Accepted Answer

This tool uses the Myers diff algorithm, the same algorithm used by Git. It computes the minimum number of insertions and deletions needed to transform one text into the other and displays the result line by line.

Question 2

Is the comparison case-sensitive?

Accepted Answer

Yes. The comparison is case-sensitive by default, matching how most text editors and version control tools work. A line with "Hello" and one with "hello" will be shown as different.

Question 3

Can I compare code files?

Accepted Answer

Yes. Paste code from any language into the two panels. The diff output shows exactly which lines were added, removed, or unchanged — identical to git diff output.

Question 4

What do the + and - symbols mean?

Accepted Answer

Lines starting with + (shown in green) are lines that exist in Text B but not in Text A — these are additions. Lines starting with - (shown in red) are lines that exist in Text A but not in Text B — these are deletions. Unmarked lines exist in both.

Question 5

Is my text sent anywhere?

Accepted Answer

No. All comparison happens entirely in your browser using JavaScript. Neither text is transmitted to any server.

Text Diff Checker

How to Use the Text Diff Checker

Common Use Cases

Frequently Asked Questions

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