Open toolkit

Text Utilities

Text Diff Checker

Paste an original and a changed version of any text to see a line-by-line comparison. Added lines are highlighted in green, removed lines in red, so you can quickly spot exactly what changed between two drafts, versions, or files. Everything is compared locally in your browser.

  • Nothing leaves your device
  • Runs entirely in your browser
  • Free, no account needed
Use Text Diff Checker - free

Frequently asked questions

Does it compare word-by-word or line-by-line?

Line-by-line. Each line is compared as a whole unit, which is the most common way to review document or code revisions.

Is my text uploaded anywhere?

No, the comparison algorithm runs entirely in your browser using JavaScript.

Can it handle very long documents?

Yes, though extremely large documents may take a moment longer to compute.

Compare two texts instantly - free, private.

Open Text Diff Checker
  • Nothing leaves your device
  • No upload required
  • No account needed
  • Unlimited use, always free

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Find and replace text, with optional case sensitivity and regex support.

Duplicate Line Remover

Remove duplicate lines from a list, with optional sorting and trimming.

Whitespace and Line-Break Trimmer

Clean up messy text by trimming extra spaces and blank lines.