What is a Text Diff Tool?
A text diff tool compares two texts and visually displays the differences. It's useful for document proofreading, code review, contract change verification, and many other scenarios. This tool detects differences at the line level, and for modified lines, highlights exactly which characters changed. For example, if 'Tokyo-to' changes to 'Tokyo-fu', only the changed part is highlighted, making it easy to spot differences at a glance.
How to Use
1. Paste the original text in the 'Original Text' area on the left. 2. Paste the modified text in the 'Modified Text' area on the right. 3. Differences are displayed in real-time. Added lines appear in green, removed lines in red, and modified lines have character-level highlighting. For large texts (over 50,000 characters), click the 'Compare' button to run the comparison.
Comparison Options
Five options are available: normalize line endings (CRLF/CR to LF), ignore whitespace, ignore case, ignore full-width/half-width (NFKC normalization), and ignore katakana/hiragana. The full-width/half-width and katakana/hiragana options are particularly useful for Japanese text, helping absorb notation differences common in PDF conversions and OCR results.
FAQ
- Is this text comparison tool free?
- Yes, it's completely free with no account registration required. You can use it immediately in any browser.
- Is my text data sent to a server?
- No, all processing happens entirely in your browser. Your text is never transmitted to any server. You can safely compare confidential documents and personal information.
- Does it support Japanese text comparison?
- Yes, it fully supports Japanese text comparison. It also offers Japanese-specific options like 'Ignore full-width/half-width' and 'Ignore katakana/hiragana' for handling text normalization differences.
- Is there a limit on text length?
- You can input up to 100,000 characters (approximately 10,000 lines) per text area. Texts under 50,000 characters are compared in real-time, while larger texts use the 'Compare' button.
- How is this different from WinMerge or VS Code?
- WinMerge and VS Code are desktop applications that require installation. This tool works instantly in your browser — no installation needed, accessible from any OS or device. For quick text comparisons, a web tool is more convenient.