eSignature legality summary
Most contracts need not be in writing or signed to be binding, though in practice Japanese parties often sign and affix a company seal as proof of intent. The Act regulates electronic signatures and provides an accreditation regime for certification businesses.
Types of permitted electronic signature
An electronic signature is a measure applied to electromagnetic-record information that (a) indicates the information was created by that person and (b) allows confirmation of whether it has been altered. Japan supports Accredited Certification Businesses (ACBs), whose certificates carry an accreditation mark. An electromagnetic record is presumed authentic where the signature is under the proper sole control of the signer and performed by them; otherwise a challenge may require further evidence (authentication, tamper-evidence, audit log).
Documents that may be signed electronically
Suitable for HR, procurement, corporate resolutions, NDAs, software licensing, healthcare, banking, real estate, lending, insurance, consumer transactions, and many government filings (depending on the document type).
Use with caution / not typically appropriate
Some laws and regulations still require hardcopy execution. To rely on the authenticity presumption, ensure the signature is under the signer’s sole control; otherwise strengthen it with authentication and an audit log.
- Specific documents that law still requires to be executed in hardcopy form
- Documents drawn by a public official in their official functions (no authenticity presumption)
Seminal court cases
None reported.
Primary sources
- Act on Electronic Signatures and Certification Business
Disclaimer: This guide is general information, not legal advice, and is not a guarantee that any signature will be enforceable for a particular document, transaction, or jurisdiction. E-signature and data-protection laws change frequently. Confirm the requirements for your specific document and parties, and consult a licensed lawyer in the relevant country before relying on electronic signing.
Last reviewed: June 15, 2026