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About this tool

Free Online Diff Editor

Compare two files or code snippets side by side instantly in your browser. No account, no install — paste your code and see differences highlighted immediately.

Side-by-Side Diff

View original and modified code next to each other with changes clearly highlighted in red and green.

Inline Diff View

Switch to inline mode to see additions and deletions within a single unified view.

Syntax Highlighting

Diffs are syntax-highlighted for 40+ languages so code is always readable, not just colored lines.

Editable Panes

Both the original and modified panes are fully editable — update either side and see the diff update live.

No Sign-up Required

Open the editor and start comparing instantly. Nothing to install or configure.

80+ Languages

Works for JavaScript, Python, JSON, YAML, SQL, Markdown, Rust, Go, TypeScript, plain text, and 70+ more.

Common Use Cases

  • Compare two versions of a configuration file or environment variable list
  • Review code changes before committing to version control
  • Check what changed between two API responses or JSON payloads
  • Compare SQL queries, Markdown documents, or plain text files
  • Spot differences in minified or formatted code

How It Works

  1. Paste or type your original code in the left pane
  2. Paste or type the modified version in the right pane
  3. Differences are highlighted automatically in real time
  4. Switch between side-by-side and inline view as needed