Duplicate Word Highlighter

About this duplicate word highlighter

Duplicate Word Highlighter — browser-based utility.

How this tool works

Marks every occurrence of any case-insensitive Unicode word token that appears more than once anywhere in the input. The current implementation does not restrict findings to adjacent duplicate words.

1. Grapheme Cluster Segmentation: Segments text using Intl.Segmenter or UAX #29 boundaries to accurately treat multi-codepoint emojis and combining diacritics as single visual characters.
2. Syntactic Chunking: Splits content into sentences using punctuation lookaheads while ignoring honorifics (e.g. 'Dr.', 'Inc.') and decimal numbers.
3. Syllable & Entropy Calculation: Computes syllable counts per word and calculates Shannon lexical entropy ($H = -\sum p_i \log_2 p_i$) to measure vocabulary diversity.
4. Index Synthesis & Metric Formatting: Produces target grade levels, estimated silent reading times (at 200-250 WPM), and speaking times (at 130-150 WPM).

Worked example

Limits and verification

Handles unspaced scripts (such as Chinese, Japanese, and Thai) by switching to character/ideograph counting rather than space-delimited word tokens. Filters extreme text lengths gracefully up to browser memory limits.

Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.

Browser processing boundary

Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.

Relevant references

These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.

• The Unicode Standard Version 15.1 (Unicode Text Segmentation)
• Standard Browser Web API / Algorithm Implementation (No single external RFC/ISO standard)

Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology

How to use it

1. Enter, paste, or select your input data into the Duplicate Word Highlighter workspace controls.
2. Review available parameter fields, units, formats, or options configured for your task.
3. Click the action button or observe immediate live calculations rendered in your browser runtime.
4. Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.