Activation

A. What is activation?

You need to obtain a Keio ID before you use keio.jp.
We call this process "activation".

Read the Terms of Use carefully before activating your ID. If you do not agree to the Terms of Use, you cannot use keio.jp.

B. Restrictions on the Keio ID and password

In principle, a Keio ID that is already registered cannot be changed.
Be sure to enter an appropriate ID when registering.
If the university administration deems the ID to be inappropriate, the ID might be invalidated.

The follows are restrictions on the characters that can be used for the Keio ID and password:

	Length	Valid characters	Invalid characters
Keio ID	2 to 31 characters	- lower case letters (a-z) - numbers (0-9) - symbols( . _ - ) (excluding parentheses)	- system reserved words (such as root and postmaster) - strings used for operation management - offensive words and strings - IDs already in use - IDs starting and/or ending with a symbol
Password	8 to 72 characters	- Lowercase Letters (a to z) - Uppercase Letters (A to Z) - Numbers (0 to 9) - Symbols ("!#$%&'()*+,-./�:;<=>?@[]^_`{\|}~)	- Your date of birth or telephone number - Words easily found in the dictionary - Keio ID or a part of it - Family name or Last name - Character strings identical to the keyboard layout (e.g. qwerty) - Passwords leaked in the past

Notes

Keio ID

The Keio ID is case-insensitive, and all letters are treated as lowercase.

Password

Letters are case-sensitive.
Password must contain four types of characters: Lowercase letters, Uppercase letters, Numbers or Symbols.

You can register any Keio ID and password within the abovementioned restrictions.

C. Activation

Last-Modified: September 26, 2025

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