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Text Diff Tool Online — Word, Char, Line Level

Compare 2 texts với highlight + / − added/removed. 3 mode: word-level (default, đọc dễ), char-level (precise), line-level (cho code). Stats added/removed/unchanged.

WordCharLineRealtime
Mode:
+ 4 added− 4 removed= 6 unchanged
The quickfast brown fox jumpsleaped over thea lazy dog.!

Vì sao dùng tool này

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3 mode diff

Word: diff theo từ, dễ đọc. Char: diff theo ký tự, precise. Line: diff theo dòng, cho code.

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Stats counter

Số ký tự / từ / dòng added (xanh), removed (đỏ), unchanged. Quick overview change scale.

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Realtime

Edit text bên nào cũng update diff ngay. Không cần bấm button.

Cách sử dụng

  1. 1Paste Text A (original) bên trái, Text B (modified) bên phải.
  2. 2Chọn mode: word (default) / char / line.
  3. 3Diff highlight: xanh = added, đỏ + strike = removed, xám = unchanged.

Text diff

Diff algorithm dùng Myers diff (E. Myers, 1986) — O(ND) complexity, tối ưu cho text. Lib jsdiff implement.

Word-level: split by whitespace + punctuation. Char-level: per character. Line-level: per \n.

  • ✓3 levels: word / char / line
  • ✓Highlight + / − inline
  • ✓Stats added / removed / unchanged
  • ✓Realtime update
  • ✓Pure client-side
  • ✓Myers diff algorithm

Câu hỏi thường gặp

Khác git diff?

Git diff line-level + Patience/Histogram algorithms. Tool dùng Myers — đủ cho daily compare. Cho code review chính thức dùng git.

Diff text >100KB chậm?

Có. Diff O(ND) — long input + many changes → exponential. Cho text >50KB recommend split.