Text Diff Checker: Spot Every Character Change

Compare two texts character by character to find exact differences and changes.

Text A
Text B

Spot Every Change: Character-Level Text Diff ✨

Compare two texts side-by-side and visualize changes down to the individual character. Whether you're proofreading a draft, auditing a legal contract, or reviewing code, catch the edits that standard line-by-line tools miss.

💡 Why use this?

"I updated my draft, but which adjectives did I actually swap?" "Is this legal clause identical to the original, or is there a hidden typo?"

General comparison tools often flag entire paragraphs as "changed." This engine pinpoints the exact additions and deletions, saving you from squinting at walls of text.

  • Pinpoint Edits: See exactly what changed with high-contrast color coding.
  • Track Revisions: Compare versions of your writing to see how your prose has evolved.
  • Scroll in Sync: Navigate long documents effortlessly as both panels stay perfectly aligned.

📘 How to use it

  • Paste and Compare: Drop your original text on the left and your revised version on the right.
  • Analyze Changes: Instantly view the total count of added and removed characters—perfect for meeting strict length requirements.
  • Read the Legend: Green highlights show Added text; red strikethroughs show Removed text.
  • Catch the Details: The tool detects changes in punctuation, whitespace, and capitalization.
  • Sync Versions: Use the "Use Text A/B" buttons to overwrite one side with the other if you decide to revert or accept a change.

🧐 FAQ

Does it have a character limit? The tool runs locally in your browser. It handles several thousand words with zero latency. Extremely large files (like full-length novels) may impact rendering speed.

Does it detect formatting? This tool analyzes plain text. It compares characters and syntax rather than CSS styling like bold or italics.

Is my data private? Yes. All processing happens locally on your machine. Your text never leaves your browser and is never uploaded to a server.

📚 Under the Hood: The Diff Algorithm

This tool uses the "Diff Match Patch" algorithm, originally developed at Google. it calculates the "Levenshtein distance"—the minimum number of single-character edits required to transform one string into another.

While developers use this technology daily via Git and GitHub to manage codebases, this tool brings that professional-grade precision to your everyday writing and editing.