FormatShiftHow to Add an Official Blue Digital Signature Stamp to PDF Online
Need to add a blue signature stamp to PDF right now?
Generate a stamp with your name & cert details or stamp a verified PDF directly in 30 seconds.
Why Add a Blue Digital Signature Stamp to PDF?
When exchanging signed files, having a clean visual stamp on PDF pages provides immediate visual confirmation of electronic signing with certificate dates and signer name.
Two Ways to Add Signature Stamp on FormatShift
Method 1: Generate Stamp Manually
- Go to /sign-document.
- Switch to "Visual PDF Signature" mode.
- Select "Blue Digital Stamp" and enter signer details.
- Click anywhere on the PDF page preview to place the stamp.
- Click "Download Stamped PDF".
Method 2: Auto-Stamp After Signature Verification
If you have a .sig file and companion PDF, open /verify-sig. After verification, click "Stamp verified PDF with visual seal" to automatically embed the signer credentials onto the last page.
Legal Status of Visual Stamp
Under digital signature regulations, the cryptographic digest (.sig container) provides mathematical non-repudiation, while the visual blue stamp acts as a human-readable facsimile for printing.
Frequently Asked Questions
Is PDF text quality preserved?
Yes. The stamp is embedded as a vector layer without rasterizing or degrading original PDF text sharpness.
Are documents uploaded to servers?
No. The entire stamping procedure runs 100% locally in your browser memory.