ToolNest

🔍Diff Checker

Compare two texts and find differences.

🆓 Free🔒 Secure⚡ Instant📱 Mobile-friendly🚫 No signup

Compare two texts side-by-side and highlight differences online for free. Line-by-line diff checker.

How to Use Diff Checker — Step by Step

  1. 1Paste the original text in the left panel and the modified text in the right panel
  2. 2Click 'Compare' — added lines are highlighted green, removed lines red
  3. 3Review the diff output line by line
  4. 4Copy the diff or download it as a unified diff file

Why Use ToolNest for Diff Checker?

  • 🟢Green highlights show added lines, red shows removed lines
  • 👁️Side-by-side and unified diff views available
  • 📄Works with code, text, JSON, and any plain-text content
  • 🆓Free — no account needed

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Frequently Asked Questions

What types of content can I compare?

Any plain text — code, JSON, YAML, prose, configuration files, and more. The tool compares line by line.

Does it do word-level diffing?

Yes. Both line-level and word-level diff views are available. Switch between them using the view toggle.

Is there a size limit?

No hard limit. Very large documents may take a moment to compare.

Is my content sent to a server?

No. Comparison runs entirely in your browser.