[ SECURE ]
Longest common subsequence
Text is split into words (and CJK characters) and compared with an LCS matrix — the same idea code review tools use.
Text Diff
Compare two pieces of text.
Original
Revised
Differences
word diffComparing…
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WHAT YOU CAN DO
01 / FEATURES[ FAST ]
Length protection
Very large comparisons are throttled and fall back to line-level diff with a clear on-page notice instead of freezing your browser.
[ LOCAL ]
Tool linkage
Send the revised text to Word Counter in one click. The hand-off uses a one-time session value that is deleted as soon as it is read.
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ABOUT TEXT DIFF
02 / OVERVIEWWhat it solves
Reading two drafts side by side and hunting for changed words is slow and error-prone, especially in review comments where you need a short, precise description of the edits.
The default inline view reads like one continuous document. Switch to side-by-side or turn on code mode when you are comparing long documents or source files.
INPUT → OUTPUTEXAMPLE_001
Original: The quick brown fox jumped over the lazy dog near the river. Revised: The quick red fox leaped over the sleepy dog near the old river. => 4 changes: brown → red, jumped → leaped, lazy → sleepy, and the added word “old”.
Common use cases
- Word-level LCS diff
- Inline and side-by-side views
- Copyable summary
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SIMILAR TOOLS
03 / RELATED›
FREQUENTLY ASKED QUESTIONS
04 / FAQWhat counts as one change?
Adjacent deletions and insertions are grouped into one change block, so a replacement such as brown → red counts once.
Why does code mode look different?
Word splitting makes source code hard to read. Code mode compares whole lines instead, which matches how developers review code.
Is there a size limit?
Word-level comparison is intended for texts under about 5,000 words. Above that the page suggests comparing in smaller sections.
Are both documents uploaded?
No. The comparison runs locally in JavaScript and neither version leaves the browser.