Electronic Signatures and Remote Signing of Cross-Border Contracts

The Electronic Transactions Act B.E. 2544 (2001), as amended, sets the general principle that information is not denied legal effect solely because it is in electronic form. Where a law requires a transaction to be in writing, an electronic record can satisfy the requirement if it is accessible and usable for later reference without its meaning changing.

Where a law requires a signature, an electronic signature can satisfy it if the method identifies the signer and indicates the signer's intention, and is reliable and appropriate for the purpose of the transaction in all the circumstances. The Act also describes reliable electronic signatures, typically those that are uniquely linked to the signer under the signer's sole control, where any alteration can be detected; these carry a stronger evidential position.

The Act sits alongside other laws. Where a specific law requires a particular form, registration or attendance, that requirement still applies. The general recognition of electronic signatures is therefore a starting point, and each document must be checked against the rules that govern it.

Certain transactions have been excluded from the general rules by Royal Decree, and others are governed by laws that require registration with an official. Land and condominium transactions, for example, are registered at the Land Office under its own procedures; parties attend in person or through a power of attorney executed in the form the Land Office accepts.

Family and succession matters often have their own formal requirements, such as registration of a marriage or divorce at a district office and the formal requirements for wills under the Civil and Commercial Code. Company filings with the Department of Business Development may be made electronically through its systems, but particular documents can still require specific signing formalities.

Many foreign authorities also require documents from Thailand to carry a wet-ink signature attested by a notarial services attorney or a notary, and then legalisation or, from 28 February 2027, an apostille. An electronic file cannot carry these physical authentications, so documents destined for such authorities are usually signed on paper.

In practice there are three broad options: a simple electronic signature, such as a typed name or scanned signature in an email or PDF; a signature through an e-signature platform that records identity checks and an audit trail; and a certificate-based signature using a digital certificate issued by a certification authority. Each gives a different level of evidence about who signed and whether the document has changed.

The right choice depends on the value and risk of the transaction, the counterparties, and who will rely on the document later. A bank, registry or foreign court may require a certificate-based signature or may refuse electronic signatures for certain documents altogether. We check those requirements before choosing a method.

Whatever the method, the evidence must be kept. We advise clients to retain the signed file, the platform's completion certificate or audit log, and any certificates used, in a form that can be produced later. A signature that cannot be proved is of little use in a dispute.

When parties sign from different countries, the contract itself should say how it may be executed. We draft clauses that allow signature in counterparts, permit electronic signature where appropriate, state that each counterpart is an original and specify when the contract takes effect.

Governing law and dispute resolution clauses also matter. A contract governed by Thai law and signed electronically will be assessed under Thai rules on electronic signatures; a contract governed by another law may be assessed differently. Where enforcement in Thailand is likely, we recommend methods that a Thai court would readily accept as evidence.

Corporate signatories must have authority. For Thai companies, that usually means the authorised directors named in the company affidavit, signing in the combination it states, and in some cases with the company seal where the articles require one. We check authority before any signature, whether electronic or on paper.

Notarial attestation in Thailand is performed by attorneys registered as Notarial Services Attorneys with the Lawyers Council of Thailand. In general, the attorney verifies the signatory's identity and witnesses the signature in person, then completes the attestation. This in-person element is what gives the attestation its value to foreign authorities.

Where a signatory is outside Thailand, the usual options are for the signatory to sign before a notary or consular officer in their country, with the document then legalised or apostilled for use in Thailand, or to travel to Thailand to sign before one of our Notarial Services Attorneys. We advise on which option the receiving authority accepts and how the timing fits the transaction.

We do not offer remote notarial attestation by video in place of in-person attestation where Thai practice or the receiving authority requires attendance. Clients are told clearly which documents can be signed electronically and which cannot, so that a transaction is not delayed by a signature the receiver refuses.

E-signature platforms process personal data — names, email addresses, IP addresses, identity documents and sometimes biometric data. Under Thailand's Personal Data Protection Act, the parties should know who controls that data, where it is stored and for how long. We review platform terms and recommend notices or contract clauses where needed.

Records should be kept for as long as the contract may be relied on or disputed, and in line with tax and accounting retention rules where the document supports a financial record. Electronic records should be stored in a way that preserves their integrity, for example in their original signed format with the audit trail attached.

For clients who sign many contracts, we help set a simple internal policy: which documents may be signed electronically, which method to use for each, who may sign for the company, and where records are kept. A clear policy reduces the risk of a disputed signature far more than any single technology choice.