Diff Checker

Compare two blocks of text or code side-by-side. Highlights added, removed, and changed lines instantly — no sign-up, nothing sent to a server.

Used 1,118 times

Mode
Original
Changed

Ctrl+Enter to compare

How It Works

Three diff modes

  • Line — compares text line by line, ideal for code, config files, and logs
  • Word — highlights individual word changes within each line, great for prose
  • Char — character-level diff, useful for spotting typos and subtle edits

Options

  • Ignore whitespace — treats leading/trailing spaces and multiple spaces as equivalent
  • Ignore case — treats uppercase and lowercase as identical
  • Swap — instantly swaps Original and Changed sides
  • Runs entirely in your browser — nothing is sent to a server

Common uses

  • Compare code before and after a refactor
  • Spot changes between two config files
  • Review edits in a document or contract
  • Debug subtle differences in API responses
  • Verify a deployment changed only what you intended

JSON Formatter

Format and validate JSON before comparing

SQL Formatter

Format SQL queries before diffing

Markdown to HTML

Convert Markdown before comparing HTML output

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