全角 and 半角
These specify full-width or half-width characters. Use the width converter instead of retyping everything.
JAPANESE FORM ERROR DECODER
Turn form errors into the next action.
Paste a Japanese validation message. Get a short explanation and exactly what to change—without a generic translation detour.
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TRY ONE
CURATED MATCH✓ Recognized
- Japanese message
- 全角カタカナで入力してください
- Plain-English meaning
- Please enter using full-width Katakana.
- What to do
- Convert the requested text to standard full-width Katakana.
- Example
デイビッド・スミス
CURATED, NOT GENERIC
Form language has patterns.
This decoder matches known validation instructions and their common variants. If a message is unknown, it says so instead of inventing a confident answer.
COMMON JAPANESE FORM ERRORS
What do Japanese website validation messages mean?
Most form errors describe a required character width, script, field, or length. The fastest fix is to identify that rule and change only the requested text.
カタカナ and フリガナ
These usually ask for a phonetic name reading. Many forms expect full-width Katakana.
文字以内
This sets a maximum character count. Spaces usually count unless the form says otherwise.