Text Style Checker

About

Catch text style inconsistencies, automatically.

A Chrome extension that detects fullwidth/halfwidth character inconsistencies in CJK text on any webpage. Catch the issues that are easy to miss by eye.

Perfect for:
• Pre-publish QA on CJK (Japanese, Chinese, Korean) content
• Verifying translated Japanese text uses consistent character forms
• Ensuring product descriptions maintain uniform text style
• Batch-checking pages before release for style violations

Detection Rules:
• Fullwidth Alphanumeric — Finds fullwidth letters and digits (e.g. Ａ–Ｚ, ０–９) that should typically be halfwidth
• Fullwidth Spaces — Spots fullwidth spaces hidden in text, preventing inconsistent spacing
• Halfwidth Katakana — Identifies halfwidth katakana (e.g. ｱｲｳ) that should typically be fullwidth

Key Features:
• One-click scan of the current page
• Each issue shown with surrounding context for easy identification
• Per-rule summary with detection counts
• Works on any webpage — CMS, e-commerce, documentation, etc.

Privacy:
• No data is ever sent to external servers
• All processing happens entirely in your browser
• No personal information or cookies are collected