How to Sign a PDF Online
Add your electronic signature to any PDF in under a minute. No downloads, no accounts, no uploads — everything happens in your browser.
Step-by-step guide
Open the PDF signer
Click "Sign PDF" in the nav bar, or go directly to signpdf.top/sign. No account needed for your first 3 documents.
Upload your PDF
Drag and drop your PDF into the upload zone, or click "Choose file". The PDF is opened locally in your browser — it's never sent anywhere.
Add your signature
Click "Add Signature" in the toolbar. Draw your signature with your mouse (or finger on mobile), or type your name and choose a font.
Position & resize
Drag your signature to the correct position on the document. Drag the corner handle to resize. You can add multiple signatures and text annotations.
Download the signed PDF
Click "Download PDF" to save the signed document to your device. The signature is permanently embedded in the PDF.
Ready? It takes less than a minute.
Free · No account required · Your file stays private
What you can add to a PDF
Hand-drawn signature
Draw with mouse or touchscreen
Text annotations
Editable font, size, and color
Date field
Auto-fills today's date
Image / stamp
Upload a PNG signature image
Frequently asked questions
Is it free to sign a PDF online?
Yes — Signpdf is free for up to 3 documents per day with no account required. Create a free account to unlock more.
Is my PDF uploaded to a server?
No. All PDF processing happens locally in your browser using PDF.js and pdf-lib. Your file never leaves your device.
Are electronically signed PDFs legally binding?
In most cases, yes. E-signatures are legally recognized under the U.S. ESIGN Act (2000) and the EU eIDAS regulation. They're valid for contracts, NDAs, and most business documents.
Can I sign a PDF on my phone?
Yes. The Signpdf editor works in mobile browsers. Open it in Safari or Chrome on your iPhone or Android and draw your signature with your finger.
What file formats are supported?
Currently PDF only. The output is always a standard PDF file.