Draw, type, or upload your signature and place it precisely on any PDF. Legally valid electronic signature recognized in most countries. Free, no account required.
Select a PDF to sign
Drag & drop your PDF file here
PDF files only · Processed securely · Never stored
How it works
No sign-up required for basic signing. Works on any modern browser - desktop, tablet or mobile.
Drop or select any PDF file. SupaPDF renders it instantly in your browser - no software install, no plugin needed.
Draw, type, or upload your signature image. Drag it to the exact position on the document you need to sign.
Click "Sign & Download" and your signature is permanently embedded into the PDF using server-side processing for maximum compatibility.
Why SupaPDF
Draw freehand, type your name in a script font, or upload an image of your handwritten signature.
Send documents to multiple signers via email magic links. Recipients don't need an account to sign.
All uploads use HTTPS encryption. Files are permanently deleted from our servers after download.
Enable SMS OTP verification for legally-binding AES signatures. Full audit trail included.
Developer API
Use the sign_pdf operation to embed signatures into PDFs inside your own application or workflow.
curl -X POST https://api.supapdf.com/v1/jobs \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"tag": "sign-pdf",
"tasks": {
"import": { "operation": "import/url", "url": "https://example.com/document.pdf" },
"sign": {
"operation": "sign_pdf",
"input": ["import"],
"fields": [
{ "type": "signature", "page": 1, "x": 50, "y": 80, "width": 200, "height": 80, "content": "data:image/png;base64,..." }
]
},
"export": { "operation": "export/url", "input": ["sign"] }
}
}'FAQ
Everything you need to know about signing PDFs with SupaPDF.
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Free to use · No account required · Instant download