Company Stamp Online: How to Build One and Apply It to Documents

You need a company stamp right now — sign a contract, certify an invoice, submit an application. The physical stamp is not nearby: ordering one takes 3–7 business days, the document needs to ship somewhere remote, and even when the stamp arrives, it stays in the office while the work happens out of one. This article covers everything that solves the problem in 10 minutes: which fields a stamp should contain, online builders, and how to apply a finished stamp to a PDF, Word, or Excel file in Stampsig.

A quick distinction. "Making a stamp" is two different tasks: designing the stamp artwork (a circle with text and identifiers) and applying that stamp to a document. The first is what online builders or stamp shops do — covered below. The second is what Stampsig does: upload your PDF or DOCX and drop a finished PNG stamp onto it in seconds.

Do US LLCs and sole proprietors need a stamp?

Legally — no. Most US states dropped the corporate-seal requirement decades ago: Delaware in 1967, California in 1994, New York in the 1990s. An LLC, S-corp, or C-corp can operate without any seal as long as the bylaws or operating agreement say so. Sole proprietors have never been required to have one.

In practice — often, yes. Reasons:

• Some banks request a corporate-seal sample on the signature card during business account opening
• Enterprise AP departments sometimes refuse unstamped invoices per internal policy
• Government filings from corporations are processed faster with a seal
• Courts are more familiar with stamped documents — convention, not rule
• International partners expect a seal: companies in China, Japan, Korea, and much of Europe expect it
• Stamped documents are challenged less often — psychological factor

What belongs on a US company stamp

There are no federal requirements for stamp content. But there are conventions that 95% of US companies follow.

A standard round corporate seal typically includes:

• Full legal company name — running around the outer ring
• Entity type (LLC, INC, CORP)
• State of formation — "Delaware," "California," etc.
• Year of incorporation
• EIN or "CORPORATE SEAL" in the center
• Sometimes — a stamp number (for organizations with multiple seals)

For sole proprietors a stamp typically reads: "[Owner Name] DBA [business name]," EIN or SSN (often masked), city of registration. The shape is up to you — round, oval, rectangular.

Three ways to get a company stamp

The right path depends on what the stamp is for: paper workflows, electronic-only, or both.

1. Order a physical rubber stamp from a stamp shop. Average price $20–$50, turnaround 1–3 business days. Right when you have regular paper-document flows, need a sample on a bank signature card, or work with agencies that require a wet stamp. Downsides: wait time, awkward when working remotely.

2. Order online with shipping. Same stamp shops, but through their websites. Price $25–$80, delivery 1–7 days depending on your state. Convenient if you do not have a physical office or are in a different state. Output is the same physical stamp.

3. Build the artwork in an online builder. Free or close to it, in 3–5 minutes. Output is a stamp image — PNG or SVG with a transparent background. Good for electronic documents, e-signed contracts, emailed invoices, or scans for counterparties. From there you drop the PNG onto the document in Stampsig — no stamp shop needed.

Online stamp builders

Several online builders generate clean stamp artwork. The Stampsig built-in stamp builder is one option — it covers every common shape and saves the design directly to your library. There are also general-purpose tools like Canva or Adobe Express where you can lay out a stamp from scratch.

What to look for in a builder:

• Transparent-background PNG export — so the stamp lands on documents without a white box around it
• SVG export — for scaling without quality loss
• Multiple shape support — round, oval, rectangle, triangle
• Custom font and color — to match your company branding
• Save to library — so you do not have to redesign each time

A transparent background is the critical detail. Without it, when you drop the stamp onto a document, you get a white rectangle around the seal that breaks the visual.

Designing a stamp that looks legitimate

Even in a free builder, you can produce artwork that looks professionally made. Common mistakes that betray a homemade stamp:

• Outer-ring text too close to the edge or too far — the right offset is about 1/16 inch from the border
• Identifiers crammed in one line without separators — use colons or vertical pipes between EIN and "CORPORATE SEAL"
• Solid fill instead of a thin outer line — the outer ring should be 0.2–0.3 mm thick
• Black ink — used rarely in the US; the standard is blue or purple
• Resolution below 300 dpi — pixelates when scaled; export to SVG instead
• Perfectly even geometry — a real rubber stamp is always slightly imperfect; a 100% perfect circle reads as fake

The last issue is solved by the aging effect in Stampsig — it adds subtle noise, ink unevenness, and a slight text offset, turning a clean PNG into a stamp indistinguishable from a real one.

Legal note: the identifiers on the stamp (EIN, company name, state) should match the actual entity. A stamp with someone else’s details or a fictional company can constitute fraud — typically prosecuted under federal wire fraud or state forgery statutes.

Standard sizes and proportions

There is no national standard for company stamp sizes in the US, but stamp shops follow industry conventions.

• Round corporate seal diameter — 1.5 to 1.75 inches (38–44 mm)
• Outer-ring text height — 2.5–3 mm
• Center area — 15–18 mm diameter, for the EIN and "CORPORATE SEAL"
• Outer line thickness — 0.2–0.3 mm
• Word spacing in the outer ring — 1.5 mm
• Sole-proprietor stamps — typically 1.25–1.5 inches

How to apply a finished stamp to a document

Once you have the PNG with your stamp, the next step is dropping it onto the document. Stampsig handles exactly that — across every common format.

In a PDF: upload the file, drag the stamp PNG from your library to the right spot, resize, save. The stamp is flattened into the page and cannot be removed by accident.

In Word and Excel: upload the DOCX or XLSX — the tool converts and returns a finalized PDF with the stamp baked in. The stamp is locked on the page and does not shift on the recipient’s side.

On invoices and contracts: the conventional placement is the bottom-right next to the authorized signature. The stamp slightly overlaps the signature (20–30%) — mimicking how a physical rubber stamp would land on real paper.

All your stamps are stored in your Stampsig account: upload the PNG once and reuse it across any document with one click. Your account also stores signatures, facsimiles, and office stamps like PAID or CERTIFIED TRUE COPY.

Legal weight of an electronic stamp

An electronic stamp is an image of a seal applied to a PDF or other document. By itself it carries no legal weight — but a physical stamp does not have independent weight either; it just supplements the signature of an authorized person.

For a document with an electronic stamp to be legally enforceable you need two things: an electronic signature from an authorized officer, and consent from both parties to do business electronically (under ESIGN/UETA). When those conditions are met, a document with a digital stamp and facsimile signature has the same legal weight as a paper one.

Multiple stamps in one organization

Larger companies often maintain several stamps:

• Main corporate seal — for important documents (contracts, powers of attorney)
• HR department stamp — for personnel files and internal HR documents
• Accounting stamp — for invoices and statements
• Notary seal — for notarized documents (when an in-house notary is on staff)
• CERTIFIED TRUE COPY stamp — for certifying copies
• FOR INTERNAL USE stamp — a simplified seal for internal-only documents

In your Stampsig account you can store all of these — accessible from one interface. For each document, pick the right stamp from the list.