FormatShiftHow to Sign Documents with Digital Signature Online
Signing contracts, invoices, or agreements online saves time and eliminates paper. Depending on workflow requirements, you can embed a visual stamp or generate a detached .SIG container.
Sign Document Online Right Now
Add a visual signature onto PDF or create a detached GOST .SIG container locally.
💡 Want to learn more about signature containers? Read our hub: What is a .SIG file & How to Verify It →
Frequently Asked Questions
What is the difference between visual and cryptographic signatures?
A visual signature is an image stamp embedded on the PDF page. A cryptographic .SIG file contains mathematical hash data for legal validation.
Are private keys uploaded to your server?
No. Operations with local certificates and CryptoPro CSP are executed strictly on your local PC.