Sign PDF Online for Free
Quickly and securely add a stamp to your PDF file — no registration or software installation
How to sign a PDF document online?
stampsig.com lets you quickly sign a PDF file online without installing any additional software. You can add a stamp to a PDF document, add an electronic signature, and download the finished file in just a few minutes.
Our online PDF editor supports adding stamps with a transparent background, which lets you create a professional-looking document without covering up the text.
PDF editor features
Working with PDF files:
- ✓Sign a PDF document online for free
- ✓Add a stamp to a PDF file with a transparent background
- ✓Add an electronic signature to a PDF document
- ✓Place a stamp on a PDF without losing quality
Benefits:
- ✓Work with PDFs right in your browser
- ✓Secure signing of PDF documents
- ✓Support for PDF files of any size
- ✓Mobile version of the PDF editor
How to add a stamp to a PDF file
Upload a PDF file
Choose a PDF document from your device or drag it into the upload area
Choose a stamp for your PDF
Use the ready-made stamps or upload your own image for the PDF document
Place the stamp on the PDF
Drag the stamp to the right spot on the PDF document and adjust its size and rotation
Download the signed PDF
Get the finished PDF file with the stamp in high quality
Frequently asked questions about working with PDFs
Can I sign a PDF for free?
Yes, all PDF features are completely free. You can sign a PDF document, add a stamp, and download the result with no limits.
How do I add a stamp to a PDF from my phone?
The service is fully adapted for mobile devices. You can sign a PDF right from your phone — upload the file, pick a stamp, and place it with a tap.
Is it safe to upload PDF files to the site?
Completely safe. Your PDF documents are processed only in your browser and never sent to a server. Once you close the page, all PDF files are cleared from memory.