Free Online Text Diff Tool

Compare two text files and highlight differences. Free online diff tool.

Text 1

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Text 2

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About the Text Diff Tool

This free online text diff tool is a professional-grade utility designed to help developers, writers, and editors identify changes between two pieces of text or two files. Whether you're comparing different versions of a code snippet, verifying a document's edits, or tracking configuration changes, our tool provides a clear, side-by-side visual representation of every addition, deletion, and modification.


We use the industry-standard jsdiff library to perform character and line-level comparisons, ensuring highly accurate results. Our editor supports large text blocks and provides instant highlighting, making it easier to spot even the smallest punctuation or whitespace changes.

How to Compare Text

  1. Input Text 1: Paste your original text or upload a file into the left pane.
  2. Input Text 2: Paste the modified version or upload a file into the right pane.
  3. Click Compare: Press the "Compare" button to trigger the diffing algorithm.
  4. Review Changes: Additions will be highlighted in green, while deletions will be shown in red for easy identification.

Key Benefits

  • Side-by-Side View: Simultaneous viewing of both versions to maintain context while reviewing differences.
  • File Upload Support: Directly load .txt, .js, .html, and other text files without copy-pasting.
  • Precision Highlighting: Deep character-level comparison that shows exactly what changed within a line.
  • 100% Client-Side: Your data never leaves your browser, ensuring total privacy for sensitive code and documents.

Text Diff FAQ

Is there a limit to the text size?

While our tool can handle thousands of lines, extremely large files (several megabytes) might slow down your browser's rendering phase. For best results, use it for focused code reviews and document comparisons.

Does it support code syntax?

Yes! It is widely used for comparing different versions of source code files across various programming languages, though it focuses on highlighting semantic changes rather than providing syntax coloring.