Catch text style inconsistencies, automatically.

Detects fullwidth alphanumeric characters, fullwidth spaces, and halfwidth katakana with one click. Catch the CJK text issues that are easy to miss by eye.

Get it on Chrome Web Store

Features

Fullwidth Alphanumeric Detection

Finds fullwidth letters and digits (e.g. Ａ–Ｚ, ０–９) and shows each occurrence with surrounding context.

Fullwidth Space Detection

Spots fullwidth spaces hidden in your text, preventing inconsistent spacing with halfwidth characters.

Halfwidth Katakana Detection

Identifies halfwidth katakana (e.g. ｱｲｳ) that should typically be fullwidth, highlighting inconsistencies.

Per-Rule Summary

Shows detection counts grouped by rule, giving you an at-a-glance overview of text style quality across the page.

Use Cases

Content Editor

Run a pre-publish QA pass on CJK text to catch fullwidth/halfwidth mix-ups

Localization QA

Verify translated Japanese content uses consistent character forms

E-commerce Ops

Ensure product descriptions maintain consistent text style across listings

QA Engineer

Batch-check pages before release for text style violations

FAQ

Is it free?

Yes, all features are completely free.

Can I add custom rules?

The current version checks three rules: fullwidth alphanumeric, fullwidth spaces, and halfwidth katakana. Custom rules are planned for a future update.

Does it auto-fix issues?

Currently it detects only. Auto-fix is planned for a future update.

Is my data sent anywhere?

No. All processing happens in your browser. No data is sent to any server.

Make text style QA effortless

Install in seconds. Try it now.

Get it on Chrome Web Store