Company Seals in Thailand: The One Country Where the Seal Is Registered With the State
Most of Southeast Asia has spent the last decade quietly retiring the company seal. Singapore made it optional, Malaysia made it optional, Vietnam handed the whole thing over to company autonomy. Thailand went a different direction — and if you have registered a company there, you may already have discovered this the awkward way, when a bank teller compared your stamp against a piece of paper and told you the impression didn't match.
Thailand is the jurisdiction where the seal is still filed with the state. Not because the law forces every company to have one, but because of how the two halves of the system interact. Understanding that interaction is the whole thing.
This article is general information, not legal advice. Rules change and apply differently to each situation. Confirm your own company's position with Thai counsel or your corporate secretary.
Optional in the law, mandatory in your own affidavit
Here is the part that trips people up. The Civil and Commercial Code does not require a Thai limited company to have a company seal (ตราสำคัญ, tra samkhan, often just called the company stamp). You could, in principle, incorporate without one.
Almost nobody does. During registration, the company specifies its signing authority — the condition under which the company is legally bound — and this gets recorded in the company affidavit issued by the Department of Business Development (DBD). The overwhelmingly common formulation reads something like: "Two authorized directors signing jointly and affixing the company seal."
The moment that sentence exists in your affidavit, the seal stops being optional for you. It is no longer a convention or a courtesy; it is a condition of valid execution that your own company wrote into the public record. A document signed by the right directors but missing the seal does not satisfy the registered binding condition, and any counterparty who pulls your affidavit can see that.
This is why the Thai seal behaves so differently from a Malaysian cop syarikat or an Indonesian stempel. Those are commercial habits. The Thai seal, once registered into your signing authority, is closer to a structural component of how your company signs anything.
It also means the honest answer to "does my Thai company need a seal?" is: read your affidavit. Not the statute, not a blog post — your own affidavit. Companies occasionally register a signing condition that omits the seal (signature of one director alone, for example), and for those companies the seal genuinely is optional. Companies with a foreign parent sometimes discover their affidavit says something they never intended, because a local agent filled in the standard wording during incorporation. Either way, the document that governs you is sitting in your corporate file.
Registering the seal with the DBD
The seal specimen is filed with the DBD as part of company registration. In Bangkok this happens at one of the DBD offices; outside Bangkok, at the Provincial Ministry of Commerce office. The physical stamp is made first, an impression is taken, and that impression becomes the registered specimen.
Two practical consequences follow:
The registered impression is a reference document. Banks, government counters, and careful counterparties can compare the stamp on your paperwork against the specimen attached to your registration. Most of the time nobody looks. When something is being scrutinised — a new bank account, a large transaction, a dispute — somebody does.
Changing the seal is a registration event. If you redesign the stamp, replace a worn one with a slightly different cut, or change the company name, the new seal has to be registered with the DBD. Unlike a company name change, this does not generally require a shareholder resolution, which makes it administratively lighter than people expect — but it is still a filing, not a decision you make by simply ordering a new stamp. If the seal change accompanies a name change, the filing sits inside that process and its deadlines.
The failure mode worth naming: a stamp wears out, an office manager orders a replacement from a shop down the street, and the new one is a few millimetres different or uses a slightly different typeface. It works fine for months, until the one day somebody compares it to the specimen. Order replacements against the registered artwork, and keep that artwork somewhere you can find it.
What the design rules actually allow
Thailand has real content restrictions on seal design, and they are stricter than most people assume from looking at a wall of Thai company stamps.
A company seal may carry the company name in Thai, in English, or both, and it may carry the company logo — alone or with the name. The name that appears must match the registered name exactly, as approved in the name reservation. Not a translation, not an abbreviation, not a friendlier version of a very long name. This sounds obvious and is the single most common reason a seal filing gets bounced back.
What a seal must not contain is a defined list of protected imagery: marks or wording relating to the monarchy and royal family, royal titles and ranks, the state emblem, the national flag, and the Garuda emblem. These are protected under Thai law generally, and the restriction reflects that. A foreign designer producing something "traditionally Thai" from stock imagery can walk straight into this — Garuda motifs in particular appear in a lot of decorative Thai design assets, and one on a company seal is a problem, not a flourish.
So the practical design space is: name, logo, or both. Round or rectangular. That constraint produces the visual uniformity you see across Thai corporate documents, and the uniformity is worth leaning into. A conventional-looking seal passes without comment; an unusual one invites a question you don't need.
If you are composing one, a round layout with the Thai name on the upper arc and the English name on the lower arc is the standard bilingual approach — the bilingual seal template uses exactly this two-arc structure and adapts to any language pair, and the plain corporate seal template works for a single-language name. You can build either in the online seal generator and export SVG to hand to a stamp maker, which gives them clean vector artwork instead of a photograph of an old impression. For choosing between the two shapes, round, oval, or square walks through what each conveys.
A note on Thai script
Thai has no spaces between words, uses stacked vowel and tone marks above and below the baseline, and has ascenders and descenders that reach further than Latin script does. On a curved arc at stamp size, this matters. Marks that sit above a character can collide with the seal's outer ring if the arc radius is tight, and a long registered name compressed to fit becomes an illegible smear at 20 mm.
Two things help: give the text ring more clearance than you would for Latin text, and check the design at actual printed size rather than on screen at 400%. If the registered name is genuinely too long for a single arc, splitting it across the arc and the center is more readable than shrinking everything. The seal fonts guide covers typeface selection, and the seal size and resolution guide explains how to think about physical size versus pixels.
Where the stamp actually gets used
Beyond formal execution, the stamp does everyday duty across Thai business paperwork:
- Contracts and agreements — beside the authorized directors' signatures, per the affidavit condition.
- Bank documents — account opening, mandates, instructions. Banks are the most likely party to check the stamp against your specimen.
- Tax paperwork — withholding tax certificates, VAT documents, and Revenue Department filings routinely carry the stamp.
- Invoices, receipts, and quotations — no law requires it, but an unstamped invoice frequently gets treated as incomplete by the recipient's accounts team.
- Government submissions and tender packets — expect a checklist line for stamped copies of company documents.
- Certified copies — company documents submitted to agencies are usually signed by a director and stamped on each page.
Only the first two categories connect to legal execution. The rest is evidentiary habit, and it's worth keeping the distinction in mind: the stamp on an invoice is a signal that the document came from the company, nothing more.
Digital documents and the ETA
Thailand's Electronic Transactions Act B.E. 2544 (2001), amended in 2019, is the framework here. It follows the UNCITRAL model and gives electronic signatures legal effect where the statutory criteria are met, and the 2019 amendments introduced a clearer notion of a reliable electronic signature — one meeting defined technical standards, which shifts the evidentiary burden in your favour if it is ever tested. The Electronic Transactions Development Agency (ETDA), under the Ministry of Digital Economy and Society, oversees the standards.
An image of your company stamp pasted onto a PDF is not any of that. It is a picture. It carries no identity verification, no tamper detection, and no audit trail, and the fact that the underlying physical seal is registered with the DBD does not upgrade the image file. This distinction is worth being blunt about, because the registered status of the Thai seal creates a false sense that the image inherits some of that authority. It doesn't. Are image seals legally valid? and electronic seal vs. electronic signature go through the reasoning.
Where a document needs to be enforceable, use an e-signature solution that meets the ETA criteria. Where it needs to look stamped — an invoice, a quotation, a certified copy, an internal approval — a clean transparent PNG applied to the PDF is exactly the right tool. Both are legitimate; the mistake is using one where the other belongs.
For the practical side, how to add a seal to a PDF or Word document covers placement, and the background remover turns a photographed or scanned impression of your existing registered stamp into a usable transparent image.
Controlling the file
A Thai company seal image deserves more care than most, precisely because the affidavit ties the seal to binding execution. Once a clean PNG exists on a shared drive, anyone with drive access can produce a document that looks correctly executed.
Reasonable practice: keep the high-resolution master restricted to whoever custodies the physical stamp, distribute flattened PDFs rather than the seal asset itself, and export at the size you actually need instead of circulating a print-resolution file. If several people need to stamp routine paperwork, give them a modest-resolution export rather than the master. The seal file management guide goes further into this, and the seal export checklist covers producing a clean transparent PNG in the first place.
FAQ
Is a company seal legally required in Thailand? Not by the Civil and Commercial Code. But if your registered signing authority in the DBD affidavit says directors must sign and affix the seal, it is required for your company's documents to be validly executed under that condition.
How do I know what my signing authority says? Check your company affidavit from the DBD. It states the binding condition explicitly.
Can the seal be in English only? Yes — Thai, English, or both are permitted, as long as the name matches the registered name exactly.
Can I put the Garuda or a royal emblem on it? No. State emblems, the national flag, the Garuda, and marks relating to the monarchy and royal titles are excluded from company seal designs.
What if I want to change the seal design? It must be registered with the DBD. Board or shareholder approval isn't generally needed for the seal itself, but the filing is. If it accompanies a name change, it follows that process and its deadlines.
Does a scanned stamp image count as the registered seal? No. The registration attaches to the physical seal specimen. A digital image of it is a graphic, not a legally distinct instrument.
Are e-signatures valid in Thailand? Yes, under the Electronic Transactions Act where the criteria are met, with reliable electronic signatures given stronger evidentiary standing since the 2019 amendments.
This article is general information, not legal advice. Verify current requirements with the Department of Business Development or a qualified Thai professional.