How do I compare two files online?

Paste both versions into the Diff Checker — it highlights additions (green), deletions (red), and modifications line by line. No file upload needed for text content.

What is a unified diff?

A unified diff shows changes in a single column with + (addition) and - (deletion) prefixes. It's the format used by git diff and most version control systems.

Can I diff JSON files?

Yes. The Diff Checker compares any text format. For JSON specifically, format both files with consistent indentation first (using the JSON Formatter) so structural differences are clear.

How to Diff and Compare Code or Text Files

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