Legal Translation in Vietnam, Thailand, and Malaysia: A Practical Guide to Documents That Get Accepted

A supply agreement is signed in English at a regional head office. Two years later, a dispute reaches a court in Ho Chi Minh City, Bangkok, or Kuala Lumpur. The judge does not start with the English original. The judge starts with the translation filed alongside it.

A document like this is accepted or rejected on three points: the language it is written in, the certification behind the translation, and the authentication attached to the original. This guide follows those points for Vietnam, Thailand, and Malaysia, then covers confidentiality, specialization, and quality control.

Why Legal Translation Is Not General Translation

Legal text is a closed system of defined terms, jurisdiction-specific phrases, and fixed structure. In a contract, a defined term such as “Affiliate” must carry one meaning from the first clause to the last annex. In a court filing, a date or an amount is part of the evidence. The translator writes for a reader with authority: a judge, a registrar, or an immigration officer.

A legal translation is judged by whether the receiving authority accepts it, so every decision starts from that authority’s rules.

Step 1: Identify the Language and Certification the Authority Expects

Vietnam: Vietnamese Translations With Certification

Vietnam’s Civil Procedure Code requires foreign-language materials to be enclosed with Vietnamese translations that are lawfully notarized or authenticated. Proceedings run in Vietnamese, and the specialised court within the International Financial Centre is the noted exception, where English may be used. A Vietnam consulting guide reports that since 1 July 2025 notaries certify the translator’s signature rather than the accuracy of the text, so the translator’s own signed certification remains the core of the file.

Thailand: Thai as the Language of the Record

A Tilleke & Gibbins litigation guide states that all documents submitted to a Thai court must be in Thai, and foreign documents must be originals or certified copies, some of which are notarized and authenticated by a Thai consul. Practitioner guides point to Section 46 of the Civil Procedure Code and to the translator’s written attestation of accuracy. The Intellectual Property and International Trade Court may allow English when both parties agree, although key documents may still need Thai translations.

Malaysia: Malay First, With Recognised Certifiers

Section 8 of the National Language Act 1963/67 provides that court proceedings, apart from witness evidence, are in the national language. In practice, cause papers are filed in Malay, often with an English translation attached, and English is the court language in East Malaysia. 

On certification, a practitioner guide reports that Malaysian High Courts treat translations by ITBM, DBP, and MTA as certified, and that the Ministry of Foreign Affairs accepts the same stamps and asks for the original stamp, not a copy. Because Malaysia has no central public registry of translators, the receiving authority’s own requirements guide the choice.

Step 2: Plan the Authentication Chain Around the 2026 Apostille Change

The Apostille Convention replaces multi-step consular legalization with a single certificate. Vietnam deposited its accession on 31 December 2025, and the Convention entered into force there on 11 September 2026. Thailand deposited its accession on 30 June 2026, and the Convention enters into force for Thailand on 28 February 2027. Until that date, existing legalization routes continue for Thai documents. A third-party member list still places Malaysia on the legalization side, so please check the official HCCH status table before each filing.

An apostille authenticates the origin of a public document. It does not translate it. The Vietnam guide notes that foreign-language documents still need a certified Vietnamese translation whether or not they carry an apostille or consular legalization. Authentication of the original becomes a shorter step, which makes the translation and its certification the most visible part of the schedule.

When a Judgment Has to Travel

Under Article 453.2 of Vietnam’s Civil Procedure Code, foreign-language documents attached to a recognition application must be translated into Vietnamese, notarised and certified, and courts in practice generally ask for a full translation. Thai courts do not recognise foreign civil judgments directly; a foreign judgment is admissible as evidence once authenticated by the Thai Embassy or Consulate and translated into Thai.

In enforcement, the translation is part of the evidence, so numbers, names, and dates receive their own review pass.

Step 3: Protect Confidentiality From Upload to Deletion

Legal files carry names, identity details, bank information, and case facts. Data-protection law now follows that information across borders. Vietnam’s Personal Data Protection Law took effect on 1 January 2026, and fines for cross-border transfer violations can reach 5% of the previous year’s revenue or VND 3 billion. Thailand’s PDPA, effective since 2022, applies a GDPR-style framework to international transfers. Malaysia’s 2024 amendments update the cross-border transfer framework.

A file that moves between a client, a project manager, a translator, and a reviewer in different countries should be mapped against these rules with counsel. The workflow controls are concrete: an NDA, an encrypted upload portal, no files on personal email or messaging apps, no storage on personal devices, and a clear deletion policy. SpeeQual’s financial translation guide describes encryption and data-privacy compliance as part of its approach to sensitive documents.

Step 4: Match the Specialist and the Method to the Document

Legal translation covers separate domains: contracts and corporate agreements, litigation documents, intellectual property, immigration files, and arbitration. Each has its own vocabulary. Patent documents, for example, add a certification step of their own. SpeeQual’s legal translation team combines certified legal translators with CAT tools, MTPE, and quality assurance, and its sworn translators handle documents that need certification.

Method follows risk. MTPE suits a large due diligence folder where first-pass understanding is the goal. Contracts, powers of attorney, and court filings call for human-led translation with a second review. A bilingual glossary approved by counsel, combined with translation memory, keeps each defined term fixed across the whole document set, and where the record is in the local language the glossary follows the wording of the local statute.

Step 5: Use a Multi-Stage Review and a Formatting Check

A legal translation passes through five stages before release:

1. Primary translation by a legal specialist
2. Terminology edit against the approved glossary
3. Proofreading by a second linguist
4. Formatting check: clause numbering, alignment with the source, and placement of stamps or attestation pages
5. Final certification: signed statement, with notarization or Commissioner for Oaths attestation where the authority requires it

Details differ by destination. In Malaysia, an official translation carries a signed statement with the translator’s name and contact details, plus a Commissioner for Oaths attestation when required. While In Vietnam, the notary certifies the translator’s signature. In Thailand, the translator attests to accuracy in writing. A short pre-submission checklist for each destination prevents rework. For the basics of certification, see What Is a Certified Translation.

Where to Start

Begin with three questions before any document is sent for translation:

1. Which authority will read this document, and in what language?
2. What certification and authentication does it need, and does the 2026 apostille change apply?
3. Who will handle the file, and where will it be stored?

Requirements differ by authority and change over time, so confirm them with local counsel or the receiving office. This article offers general information, not legal advice.

Preparing documents for a court, registry, or regulator in Vietnam, Thailand, or Malaysia? Explore SpeeQual’s services.