Diff Checker
Free online diff checker and text comparison tool. Compare two code or text blocks side-by-side with line-level diff, additions, and deletions highlighted.
Ready to compare
Original
Modified
Diff Output
Paste text in both panels above and click Compare.
Frequently Asked Questions
What does a diff checker do?
A diff checker compares two pieces of text and highlights the differences — lines added, removed, or modified. It is commonly used to compare code changes.
Can I compare code files?
Yes. Paste any two text files, code snippets, JSON, XML, or plain text and the diff tool will show all differences line by line.