Diff Checker
Compare two texts and find the differences
📄 Original Text
📝 Changed Text
📊 Differences
About Diff Checker
Paste two versions of a text and see exactly what changed between them: which lines were added, which were removed, and which stayed the same. Useful for contract revisions, code snippets, translations and any document that came back edited.
How the comparison works
The tool aligns the two texts and marks the differences line by line. Additions and deletions are highlighted separately, so a modified line usually appears as one removal plus one addition rather than as an edit — that is normal for line-based comparison and is how version control tools present changes too.
Why does it show changes when the text looks identical?
Almost always invisible characters. Trailing spaces, a tab where spaces were used, Windows line endings (CRLF) against Unix ones (LF), or a non-breaking space pasted from a web page. Text copied out of a word processor frequently carries curly quotes and non-breaking spaces that look identical on screen.
Is my text uploaded anywhere?
No. The comparison runs entirely in your browser with JavaScript, so both versions stay on your device. That matters when the document is a contract, a medical note or unreleased code — none of which should be pasted into a service that transmits them.