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.
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.
Help and examples
Japanese validation messages usually name one concrete rule: required input, character width, script, format, or length. Decode that rule before changing the value.
Example: 全角カタカナで入力してください → Enter the value using full-width Katakana.
Common mistakes
- Translating the message without acting on its formatting instruction
- Changing every field instead of the one next to the error
- Assuming an unknown message has a specific fix
Questions
Does this translate any Japanese error?
No. It is intentionally focused on common form-validation messages and clearly labels messages outside its curated database.
Why do similar messages produce the same answer?
The decoder ignores common punctuation and wording variants such as して下さい and してください.