FormatShiftHow to Sign a Document with Digital Signature Online
An electronic digital signature is the modern, secure way to confirm the authenticity and integrity of electronic documents. Today, you don't need to purchase or install complex software to sign files. Everything can be done securely right in your browser.
Methods to Sign a Document Online
1. Cryptographic GOST Signature (CryptoPro)
If you have a digital signature certificate (EDS / GOST) issued by an official Certification Authority, you can sign any file directly from your computer. The signature is generated locally without uploading your private keys or documents to the server.
Use our secure tool to generate a detached CMS signature (.sig file):
Sign File with GOST →2. Visual Signature Stamp on PDF
If you only need to sign a PDF document visually (e.g., placing an ink-like stamp, a hand-drawn signature, or a facsimile on any page of your contract), you can upload your PDF, draw your signature, and save the result.
Upload your PDF and place a high-quality visual signature stamp on any page:
Draw and Stamp Signature on PDF →Advantages of Web-Based Local Signing
- Absolute Privacy: All signature calculations and image rendering occur on your local device (PC or mobile phone). Neither your private keys nor the documents are uploaded to our servers.
- Zero Cost: No subscriptions, ads, or installations required.
- Multi-platform: Works seamlessly on Windows, macOS, Linux, and mobile devices.