How to Make a Verifiable Company Seal Online (Not Just a PNG)

Search "company seal online" and you will find plenty of tools that hand you a nice round seal as a PNG. The problem: a picture of a seal proves nothing, it can be copied onto any document in seconds. If your seal is meant to signal authenticity to a bank, registry, partner, or court, you need a seal that can be verified, not just viewed. Here is the difference, and how to make one.

Why a picture of a seal is not enough

A traditional company seal (or "common seal") signals that a document is officially executed by the company. The digital equivalent most generators produce is an image, and an image carries no proof. Anyone who receives a sealed document can lift the seal and reuse it. There is no way for a third party to tell a genuine application from a forged one.

For internal memos that is harmless. For board resolutions, certified copies, share certificates, or anything a regulator might examine, an unverifiable seal is a weak link.

What makes a seal "verifiable"

A verifiable digital seal adds three things a flat image lacks: a serial number unique to each application, a verification token a recipient can check, and a public verification page (often reached by a QR code or link) that confirms the seal is genuine, shows which document it belongs to, and whether it has been revoked.

Crucially, the seal is bound to the document by a cryptographic fingerprint (SHA-256), so if a single character of the document changes after sealing, verification fails. That binding, seal to specific, unaltered document, is what turns a decorative mark into evidence.

Revocation: the thing a rubber stamp can never do

Physical seals and image seals are permanent, once out, they cannot be recalled. A verifiable digital seal can be revoked: if trust changes, or a document is superseded, you withdraw the seal and anyone who verifies it sees that it is no longer valid. That single capability is a strong reason to move company seals online properly, not just as graphics.

How to create one

Open the stamp and seal designer at pdfverified.com/stamp-maker. Choose a round seal, add your company name and registration number around the ring, a centre mark or logo, and a date or serial line. Preview it live, then either download a transparent PNG for $1.50 or apply it directly onto your PDF as a serialized, QR-verifiable seal.

When you apply it to a document inside PDF Verified, the document is sealed with a tamper-evident SHA-256 fingerprint and carries a public verification link on every page, so a recipient can confirm, in seconds and without an account, that the seal and the document are genuine. That is the difference between a seal people look at and a seal people can trust.

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