About Japanese Zenkaku ⇄ Hankaku Converter (全角半角変換)
Lightning-fast Japanese character converter. Convert between Full-width (全角) and Half-width (半角) Katakana with voiced sound mark merging (濁点・半濁点), alphanumeric text, numbers, and spaces for e-Tax and bank forms.
Key Capabilities & Features
- Voiced Katakana sound mark reconciliation (ｶﾞ -> ガ)
- Full-width & Half-width alphanumeric conversion
- Japanese punctuation & space conversion
- One-click e-Tax & Bank Form clean preset
- Live character breakdown statistics
How to Use Japanese Zenkaku ⇄ Hankaku Converter (全角半角変換)
Paste Text
Paste your Japanese or mixed alphanumeric text into the input box.
Choose Preset
Select e-Tax & Bank Form Clean, All to Half-Width, or All to Full-Width.
Copy Converted Text
Click Copy Converted Text to paste into your target application or portal.
Privacy & In-Browser Execution Guarantee
Zero server transmission. Text conversion executes instantly in local JavaScript memory.
Frequently Asked Questions
What is the difference between Zenkaku and Hankaku?
Zenkaku (全角) characters occupy a full square typographical em space (standard in CJK fonts), while Hankaku (半角) characters occupy half an em width. Japanese government and banking forms often require specific widths.
How does this tool handle voiced Katakana like ガ and パ?
In half-width katakana, voiced sounds are represented by two separate characters (e.g. ｶ + ﾞ). This tool automatically merges them into a single full-width glyph (ガ) and vice-versa.