A Missouri professional engineer seal measures 1-3/4 inches in diameter and shows two concentric circles, the phrases State of Missouri and Professional Engineer, your licensed name, and your license number with a PE prefix. An embosser, an inked rubber stamp or a computer-made seal image can carry it if it matches that design. This page covers the seal face, size, devices, signing, final documents and digital signatures.
Engineer Seal Stamps compliance desk. Checked against 20 CSR 2030-3.060(1) and the Board for Architects, Professional Engineers, Professional Land Surveyors, and Professional Landscape Architects. Sources read September 2026.
| Requirement | What the rule says | Source |
|---|---|---|
| Diameter | 1-3/4 inches. One figure, with no range, minimum or tolerance. | 20 CSR 2030-3.060(1) |
| Outline | Two concentric circles. | 20 CSR 2030-3.060(1) |
| Fixed wording | State of Missouri, and Professional Engineer. | 20 CSR 2030-3.060(1) |
| Name | Shown in the form under which you are licensed. | 20 CSR 2030-3.060(1) |
| License number | Preceded by the letters PE. | 20 CSR 2030-3.060(1) |
| Devices | Embosser, rubber stamp or computer-generated image, each matching the prescribed size, design and content. | 20 CSR 2030-3.060 |
| Signature and date | Three signature forms qualify. The date reflects when the document was sealed, not when it was sent. | 20 CSR 2030-3.060(3) |
| Documents to seal | All work in its final form. | § 327.411.1,.3,.4, RSMo |
| Digital signature | Unique to you, under your sole control, verifiable, and tied to the document so any change voids it. No technology is named. | 20 CSR 2030-3.060(3) |
| Renewal and lapse | The seal statute and seal rules do not address it. | § 327.411, RSMo, and 20 CSR 2030-3 (silent) |
Missouri is one row in our professional engineer seal requirements by state table, which sets each jurisdiction's rule side by side.
What does a Missouri engineer seal look like?
Two concentric circles carrying the phrases State of Missouri and Professional Engineer, your licensed name, and your license number with the PE prefix. 20 CSR 2030-3.060(1) prescribes that design for each Missouri professional engineer.
The PE prefix is part of how the number appears on the seal, so the digits alone fall short of the design. Send your name exactly as it reads on your license. Our post on Missouri engineering seal usage is a related read.
What size must a Missouri PE seal be?
Exactly 1-3/4 inches across. 20 CSR 2030-3.060(1) states that single dimension, and no range, floor or tolerance accompanies it, so the die should be built to exactly that figure rather than to anything near it.
That precision carries over to digital work, because a computer-generated seal has to be identical in size to the prescribed design. Scale your seal image so it prints at 1-3/4 inches on the sheet, and check it at full size before you use it.
Which devices can carry the Missouri seal design?
A computer-generated image, a rubber stamp or an embosser. 20 CSR 2030-3.060 accepts all three, on the condition that each one matches the size, design and content set out in section (1) of the rule.
An inked rubber stamp cut at 1-3/4 inches handles paper sets, and a seal image built from the same artwork keeps your electronic sheets consistent with it. Our post on the Missouri engineer seal is a related read.
How do you sign and date a Missouri sealed document?
20 CSR 2030-3.060(3) accepts three forms of signature, and the date you place records when the document was sealed, not when it was transmitted. This page does not list the three signature forms, so read the rule for them.
Whatever form you use, date the sheet for the sealing event rather than the day it goes out to a client or reviewer. If a sheet is sealed on one day and sent a week later, the earlier date is the one that belongs on it.
Which Missouri documents must be sealed?
Everything final. Under § 327.411.1,.3,.4, RSMo, the seal goes on work in its final form, so finality is the dividing line. This page does not break that duty into a separate list of document types.
Build sealing into your issue process so the impression goes on at the point a document becomes final. Our post on Missouri PE stamp guidelines is a related read.
What does Missouri require of a digital signature?
Four things: it must be unique to you, kept under your sole control, capable of verification, and tied to the document in a way that voids the signature if any data on it changes. 20 CSR 2030-3.060(3) sets these criteria.
The rule names no technology, no cryptographic standard, no issuer and no algorithm. Any signing method you choose has to meet all four criteria, so confirm your software can show that a sealed file has not been altered since you signed it.
Does Missouri limit sealing after a license lapses?
The seal provisions checked for this page do not address it. Missouri's seal statute and the board's seal rules say nothing about renewal or lapse, so there is no Missouri seal rule on that point to report here.
Track your renewal date through your own license records, since the seal provisions give no timeline. The table above cites the provisions that are silent on the question.
What should you have ready to order a Missouri PE seal?
Your name as licensed, your license number (the PE prefix goes in front of it), and your choice of device. The 1-3/4 inch size, the two circles and the fixed wording all come from the rule.
If you plan to use a computer-generated image as well as a stamp, build the image from the same artwork as the stamp so the two match in size, design and content. Our post on meeting Missouri PE stamp requirements is a useful companion.
How do you check a Missouri seal impression?
Stamp a test sheet and measure the diameter; it should come to 1-3/4 inches. Then confirm the two circles, both fixed phrases, your licensed name and the PE-prefixed number all appear clearly on the impression.
For a computer-generated seal, print a sheet at full scale and lay it beside the stamped test to confirm the two match. Scan the stamped sheet as well so you know the impression reads on copies.
Frequently asked questions
Is a 1-5/8 or 2 inch seal acceptable in Missouri?
The rule states 1-3/4 inches with no range and no tolerance, so a device at another size does not match the stated dimension. Order at 1-3/4 inches.
Does the date go on the seal itself?
No date is among the items 20 CSR 2030-3.060(1) places on the seal. The date you add records when you sealed the document, under 20 CSR 2030-3.060(3).
Do I sign across the Missouri seal?
The facts checked for this page do not address where the signature sits relative to the seal. They cover the accepted signature forms and the date, not placement.
Can the seal shrink when I reduce a drawing?
The rule states a 1-3/4 inch diameter and, in the facts checked here, says nothing about reduced prints. Keep full-size sets at full scale so the seal measures correctly.
Is a scanned image of my signature a digital signature?
A digital signature has to be verifiable and tied to the document so that any change voids it, and a plain image does neither on its own. The rule also accepts three signature forms, so check 20 CSR 2030-3.060(3) for where a scan fits.
Order your seal from our Missouri engineer stamps and seals with your name and license number exactly as licensed.
