Add an official stamp to a PDF online
Add an official stamp to a PDF online without any software: design your stamp or company seal, then apply it onto your PDF and download the stamped file. Each application can carry a serial number and a public QR verification link, sealed with a tamper-evident SHA-256 fingerprint.
When to use a PDF Stamp
- Stamping invoices and contracts
- Approval and certified-copy marks
- Company seals on PDFs
- Official document stamping
How to add a PDF Stamp
- Open the stamp maker and pick the PDF Stamp preset.
- Set the color, position and optional date or serial number.
- Download a transparent PNG or apply it to your PDF.
Design tips that make a PDF Stamp look official
- Export as a transparent PNG. A stamp with a white box behind it looks pasted-on the moment it touches letterhead; a transparent one sits cleanly over text and lines.
- Keep ring text short. On round seals, the company or authority name curves around the edge — 40–60 characters reads best. Put registration or licence numbers on the bottom arc.
- Use a light aging texture. A slight fade reads like a genuine inked impression instead of a sticker. The stamp maker has a texture slider for exactly this.
- Classic ink colors read as official. Deep blue and red are the conventions for PDF Stamps; keep logos monochrome inside the seal.
Make it verifiable — the upgrade rubber can't match
The weakness of every physical PDF Stamp is that one photographed impression can be copy-pasted onto anything. PDF Verified fixes this with serialization: each application can carry a unique serial number and a QR code that resolves to a public verification page showing who issued the stamp and which document it belongs to. A pasted image fails that scan instantly — which flips the forgery economics of the PDF Stamp completely.
Is a digital PDF Stamp legally valid?
In most jurisdictions the signature makes the document binding and the stamp is supporting evidence of authority — and electronic seals are recognised wherever commercial practice expects them (Kenya's KICA, the UAE's Electronic Transactions Law, eIDAS in the EU). A serialized digital PDF Stamp actually carries more evidential weight than ink, because it comes with a tamper-evident record of when and where it was applied.
Frequently asked questions
Is the pdf stamp free?
Yes - create, edit and download a pdf stamp for free, with no signup to try. Verified, serialized versions are included on Business plans.
Can I add a date to the pdf stamp?
Yes. Toggle the date on and it's placed inside the stamp; you can also add a serial number, change the color, or add your logo.
What format do I get?
A transparent PNG you can drop anywhere, or apply the stamp straight onto a PDF inside PDF Verified.
How do I add an official stamp to a PDF?
Design your stamp in the PDF Verified stamp maker, upload your PDF, place the stamp where you want it, and download the stamped PDF. You can also seal it with a tamper-evident fingerprint and public QR verification.