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EDIT
Sign a PDF in your browser: draw, type or upload your signature, then place it, your initials or a stamp on the page.
QUICK ANSWER
To sign a PDF, add the file and the editor opens with the signing tools. Draw, type or upload your signature, or pick one you saved, then click where it goes and resize it. Add initials, a date or a stamp the same way, then download the signed PDF. It runs in your browser, so your file isn’t uploaded.
Updated 31 October 2026 · Written by the StackPDF teamUpdated 31 October 2026 · StackPDF team
The editor opens with your signature tools. It stays in this browser.The editor opens with your signature tools. It stays in this browser.
PDF files · Runs in your browser
QUICK ANSWER
To sign a PDF, add the file and the editor opens with the signing tools. Draw, type or upload your signature, or pick one you saved, then click where it goes and resize it. Add initials, a date or a stamp the same way, then download the signed PDF. It runs in your browser, so your file isn’t uploaded.
Updated 31 October 2026 · Written by the StackPDF teamUpdated 31 October 2026 · StackPDF team
HOW TO
Drop it here, or choose it from your computer, your phone or My files.
Draw it, type it or upload a picture of it. Signatures saved to your account are ready next time.
Click where it goes, resize it, add initials or a date, then download.
GOOD TO KNOW
Pick the kind of signature the document needs.
| OPTION | WHAT IT ADDS | GOOD FOR |
|---|---|---|
| Draw | Your handwritten signature | Letters, forms and agreements |
| Type | Your name in a handwriting font | Quick sign-offs |
| Upload | A photo or scan of your signature | Matching your paper signature |
| Initials, date and stamps | Small marks next to clauses | Contracts that ask for initials on each page |
Need proof of who signed? Add a certificate signature with Digitally sign a PDF.
PRIVACY
Yes. Sign PDF runs in your browser, so the file never leaves your device.
StackPDF opens the PDF in your browser tab and does the work there.
Close the tab and it’s gone. Free results download to your device. Premium can also keep them in My files.
pdf-lib, PDF.js and qpdf do the work, inside your browser.
FAQ
Add the PDF, draw, type or upload your signature, click where it goes and download. It all happens in your browser.
Yes. The free plan includes 1 PDF export a day, with no account. Premium removes the daily limit for $5.99 a month or $39.99 a year.
No. You sign the PDF in your browser, so the file stays on your device.
Many countries accept electronic signatures for everyday documents such as forms, letters and many contracts. Some documents need a certificate signature or a witness, so check the rules where you are.
Yes. Sign in and save it to your account, and it’s ready the next time you sign a PDF.
Sign PDF places a picture of your signature on the page. Digitally sign a PDF adds a certificate seal that proves who signed and that nothing changed since.