Diff Checker

Compare two blocks of text or code and see the differences highlighted line by line.

Paste text in both panels to compare.

Common Use Cases

  1. Code review prepPaste the original file on the left and your edited version on the right to see exactly what changed before submitting a pull request.
  2. Configuration file comparisonCompare two versions of a config file (nginx.conf, docker-compose.yml, etc.) to catch accidental changes or verify a migration.
  3. Before/after text spot checkPaste the original text on the left and the revised text on the right to quickly verify that only the intended changes were made.

Pro plan — coming soon

Save your history, create reusable presets, and share outputs with a link. One plan, all tools.

See what's planned →

Frequently Asked Questions

Related Tools

Data Format Converter
Convert between JSON, YAML, TOML, CSV, XML, and SQL. Auto-validates input and prettifies with one click.
Regex Tester
Test JavaScript regular expressions against multiple strings with live matching, capture group inspection, and match indices.
Markdown to HTML
Convert Markdown to sanitized HTML with a live side-by-side preview. Copy the HTML fragment or download a complete file.