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ConvertBox

Diff Viewer

Compare two pieces of text or code line-by-line, with inline word-level highlights. Perfect for reviewing diffs without leaving the browser.

How to Use

  1. Paste the original text on the left.
  2. Paste the changed text on the right.
  3. Review added/removed lines and inline word changes.
  4. All comparison happens in your browser.
  5. Copy the formatted or generated result directly to your clipboard.
  6. Use the result in your application, configuration, or documentation safely.

All processing is done in your browser, and files are never sent to a server.

Frequently Asked Questions

No. Comparison runs entirely in your browser using the diff-match-patch library.
Diff Viewer provides a side-by-side view with inline word-level highlighting. The text/diff tool gives a simpler unified diff.
Performance is good up to a few thousand lines. Very long texts may slow rendering.
No. All operations are processed entirely inside your browser's local sandbox using client-side APIs (like WebAssembly, pdf-lib, or HTML5 Canvas). Your files and data never leave your device.
The tool is completely free with no usage limits. However, since processing occurs in your browser's memory, we recommend keeping file sizes under 50MB (especially for heavy files like PDFs or videos) to ensure stability.
No. All tools on ConvertBox are 100% free. We do not insert watermarks, limit features, or require any registration or payment.
Yes. Once the page and its local library dependencies are loaded in your browser, the conversion logic runs completely offline without needing an active internet connection.

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