Japanese Full/Half-width Converter (Zenkaku/Hankaku)
The definitive tool to convert Japanese text for bank forms. Instantly switch between Zenkaku (Full-width) and Hankaku (Half-width) Katakana, numbers, and symbols.
Japanese Full-width / Half-width Converter
Convert between Zenkaku (full-width) and Hankaku (half-width) characters. Essential for Japanese bank forms and legacy systems.
Input Text
Converted Result
Result will appear here automatically
Common Problems
How to convert Japanese name to half-width Katakana for bank transfer?
Paste your Katakana name into this tool and select 'Full to Half'. It will instantly generate the 1-byte version required by Japanese banking apps and ATMs.
How to fix Zenkaku/Hankaku validation errors on Japanese forms?
Use this converter to normalize your input. If the form asks for 'Hankaku', use our tool to convert your numbers and letters to half-width ASCII equivalents.
How to convert full-width numbers to standard ASCII numbers?
Paste your full-width numbers (０-９) and use the 'Full to Half' mode to get standard numbers (0-9) used in programming and global systems.
What types of characters does this Zenkaku/Hankaku converter handle?
The converter handles full-width Katakana (ア→ｱ), full-width Latin letters (Ａ→A), full-width digits (１→1), full-width punctuation (。→.), and voiced/semi-voiced marks (ガ→ｶﾞ). Hiragana is not converted because there is no half-width Hiragana in standard encodings.
How do I convert full-width spaces and punctuation to standard ASCII equivalents?
Switch to 'Full to Half' mode and paste the text containing full-width spaces ( ) or punctuation such as ．、。The tool converts each character individually, so you can clean mixed-width text from spreadsheets, copied PDFs, or CRM exports in one pass.
Workflow
What is Japanese Full/Half-width Converter (Zenkaku/Hankaku)?
Struggling with 'Invalid Character' errors on Japanese bank forms? This tool is designed to solve that. It converts standard Japanese text into the specific 'Hankaku' (Half-width) format required by legacy financial systems and official registrations in Japan.
How to use Japanese Full/Half-width Converter (Zenkaku/Hankaku)
1. Paste your text (e.g., your name in Katakana or an address). 2. Click 'Full → Half' for bank forms. 3. Copy the normalized result. The tool handles complex Katakana marks (voiced/semi-voiced) automatically.
Example
Scenario: Entering your name for a bank transfer.
Input (Full-width): ヤマダ タロウ
Output (Half-width): ﾔﾏﾀﾞ ﾀﾛｳUse Cases
1. Converting names to Half-width Katakana for Japanese bank account transfers.
2. Fixing 'Full-width only' or 'Half-width only' validation errors on Japanese websites.
3. Normalizing address data (numbers and hyphens) for shipping labels.
4. Cleaning up mixed-width characters in database records.
FAQ
Why does my name get rejected by the bank form?
Most Japanese banks use legacy Zengin systems that only accept 1-byte (Half-width) Katakana. Standard keyboard input is usually 2-byte (Full-width), which causes the error. This tool fixes that by re-encoding each character.
How do you handle Katakana marks like 'ガ' or 'パ'?
In Full-width, 'ガ' is one character. In Half-width, it must be split into 'ｶ' and 'ﾞ'. Our tool does this automatically to ensure your data is system-compatible.
Is it safe to paste my name here?
Yes. AIStacker runs entirely in your browser. No data is sent to any server. Your privacy is guaranteed.