Multi-factor authentication using email

Registering an email address

How can I verify whether or not I have registered an email address?

If you have not yet registered an email address to your account, the message "Your email address is not registered" will appear in red on the top page after logging in to the NDL Search website. Please visit your My Account page to register an email address to your account.
If you have already registered an email address, login to the NDL Search website, and click the My Account icon at the upper right of the window to display the My Account & Settings page. Your registered email address will be shown on the page.
To change your registered email address, click the Review or Update User Information button and then click the Change button to the right of your current email address.
Enter the email address you wish to register in the New Email Address input field and then click the Update button at the bottom of the window. A confirmation email will be sent to your new email address. Click the URL to Confirm Email Address Update in the body of the email to update your email address.

What happens if I don't register an email address?

Without authentication by email, you will generally not be able to log in from outside National Diet Library facilities, nor will you be able to request remote photoduplication or any other NDL service via the Internet.
Also, if you lose your password without registering an email address, you will not be able to reset your password yourself and will need to visit the Tokyo Main Library, visit the Kansai-kan, or contact by postal mail, which will take time.

I don't have an email address. What should I do?

If you plan to use the NDL Search website or the National Diet Library Digital Collections from outside National Diet Library facilities, we recommend that you obtain an email address before June 2026 so that you can receive authentication codes. It is convenient to use an email address that you can check at any time, such as on your smartphone.

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Can I keep using my eight-digit password?

If you are still using an eight-digit password that was set before May 20, 2025, or an otherwise easy-to-guess password, we recommend changing it to a more complicated one with 12 or more digits.

Do I need to enter an authentication code every time I use the NDL Search or National Diet Library Digital Collections websites?

The NDL Search, Mina Search, and National Diet Library Digital Collections websites allow the use of a single authenticated login (single sign-on) for all three websites.
If you check the Keep Me Logged In checkbox when logging in to one of the above three websites, you will not need to log in again on that device for 60 days. We recommend keeping Keep Me Logged In checked if you use these services frequently. For your own security, however, please uncheck the Keep Me Logged In checkbox if you share a device with others.

Do registered institutional users also need to enter an authentication code?

Registered institutional users need to enter an authentication code when logging in to the NDL Search or National Diet Library Digital Collections websites, so please check your registration information and register or update an email address that can be used when using the services.
For information on logging as a partner library of the Digitized Contents Transmission Service for Libraries, please refer to the email sent by the National Diet Library on March 17, 2026.