Updated September 24, 2026
Is an electronic signature legal in Japan?
Short answer: Yes. The Act on Electronic Signatures and Certification Business presumes an electronic record to be authentic if the principal applied a qualifying electronic signature to it.
The laws
Act on Electronic Signatures and Certification Business (Act No. 102 of 2000)
In force since 1 April 2001. Article 2 defines an electronic signature, Article 3 creates a presumption of authenticity, and the Act sets up an accreditation system for certification businesses.
Definition of an electronic signature
Under Article 2(1), an electronic signature is a measure applied to information in an electronic record that both indicates the information was created by the person who applied the measure and allows confirmation of whether the information has been altered.
The Article 3 presumption
Article 3 presumes that an electronic record was authentically created if the principal performed an electronic signature on it (subject to the conditions in the Act).
A signature that does not qualify for the presumption can still be used as evidence. The party relying on it will need to prove authenticity in other ways, such as with an audit trail.
Practical tips for Japanese businesses
Electronic signatures that do not meet the Act's definition can still be used as evidence, but the Article 3 presumption will not help you. Some documents are governed by other laws with their own form requirements, so check the rules for the specific document.
eSignSimple provides simple electronic signatures with an audit trail that records timestamps, IP addresses and a document hash. It does not issue qualified, advanced or certificate-based signatures, so where a law requires one of those you will need a licensed or accredited provider.
This page is general information about how electronic signature law works, not legal advice. For a specific high-value or regulated transaction, check with a qualified lawyer in the relevant jurisdiction.
Documents that need more than a simple e-signature
- Documents that other laws require to be in a specific form
- Government filings that require a certificate-based signature
Official sources
- Act on Electronic Signatures and Certification Business (Japanese Law Translation)
- Act on Electronic Signatures and Certification Business (Digital Agency)
This guide is general information, not legal advice. Laws change and details depend on your situation; consult a qualified lawyer in Japan for specific transactions.
Frequently asked questions
What does Article 3 of Japan's e-signature act do?
It presumes an electronic record to be authentic if the principal applied a qualifying electronic signature to it.
When did Japan's e-signature law take effect?
The Act on Electronic Signatures and Certification Business came into force on 1 April 2001.
Is a simple e-signature admissible in Japan?
Yes, it can be used as evidence, but it may not get the Article 3 presumption, so keep proof of who signed and that the document was unchanged.
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