Get the format right before you submit.
Clear answers for the Japanese form rules that are hardest to infer: names, character width, contact details, and era dates. Every guide includes a worked example, source links, and a tool for the next step.
Six guides · Reviewed August 18, 2026
Names and form formatting
Match Japanese field labels, scripts, widths, and the identity records a service expects.
Why Won’t a Japanese Website Accept My Name?
Diagnose the field, script, width, separator, name order, or registered-spelling mismatch.
Read the guide →GUIDEHow to Enter a Foreign Name on Japanese Forms
A field-by-field guide to 姓, 名, セイ, メイ, フリガナ, middle names, and Latin spelling.
Read the guide →GUIDEWhat Does 全角 Mean?
Understand full-width and half-width letters, numbers, Katakana, spaces, and validation messages.
Read the guide →Contact details
Prepare Japanese addresses and phone numbers for domestic forms and international use.
How to Write a Japanese Address in English
Put the postal code, place names, building, room, and JAPAN in a clear international order.
Read the guide →GUIDEHow to Write a Japanese Phone Number With +81
Apply the leading-zero rule to Japanese mobile and landline numbers without losing digits.
Read the guide →Dates and calendars
Convert complete dates safely across Western years and Japan’s modern eras.