Sign a PDF with your signature
Upload a signature image, place it on any page at any position, and download a signed PDF. Supports multiple signatures and initials.
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Signing a PDF used to mean printing it, signing on paper, scanning it back in, and emailing the result. PDFOnly's PDF signature tool eliminates the round-trip. Upload a PNG or JPG of your signature (transparent background works best), then click anywhere on any page to place it, drag to fine-tune the position, and download a signed PDF in seconds. Works for contracts, NDAs, intent letters, lease addenda, expense forms — anywhere a visible signature stamp is what the recipient expects.
How to sign pdf step by step
- 1
Upload the PDF you want to sign
Drop the contract, agreement, or form you've been sent. We render it page by page in your browser so you can see exactly where your signature should go.
- 2
Upload your signature image
Use any PNG, JPG, or WebP. PNG with a transparent background looks most professional — no white box around your signature. To create one: sign on white paper, photograph it, remove the background with a tool like remove.bg, save as PNG.
- 3
Click on the signature line to place it
The signature appears at your click point. The default size is 150 points wide (about 2 inches at 72 DPI) — typically a good size for a signature line. Drag the placed signature to fine-tune.
- 4
Adjust size if needed and download
Set the width in the inspector if 150 points is too big or small for the signature line. Click Sign and Download — you get a fresh PDF with the signature image flattened into the page.
Why sign pdf on PDFOnly
Click-to-place precision
Most signature tools force you to drag from a sidebar, which is fiddly. We let you click anywhere on the rendered page — the signature appears at your click. Drag to refine after.
Real-time preview
We use pdf.js to render the PDF in your browser, so you see the actual document with your signature at full fidelity. No mockup screens, no misaligned final outputs.
Multiple signatures per page
Need to sign and date in two different places? Place the signature, then place a date stamp (or another signature) elsewhere. Most tools force one stamp per page.
What people use sign pdf for
A few common scenarios. If your workflow looks like one of these, this tool is a good fit.
Sign a contract a counterparty sent you
Drop the contract, drop your signature image, click on the signature line, download. Send back. Total round-trip: 30 seconds.
Sign a lease or rental agreement remotely
Tenant gets the PDF, signs it on PDFOnly, sends back. Landlord countersigns the same way. No printing, no scanner, no hassle.
Stamp invoices and quotes with an authorization signature
Add a manager's signature to outgoing quotes as a stamp of authorization. Common in B2B sales workflows.
Initial multiple pages of a multi-page document
Place your initials on every page (some legal docs require this). Use the multi-placement feature to add the same image once per page.
What you get
- Click-to-place positioning — see exactly where your signature lands
- Drag to reposition after placing — pixel-perfect alignment with the signature line
- Resize to fit any signature box — height auto-adjusts to keep aspect ratio
- Place multiple signatures — initials on every page, full signature on the last
- PNG with transparency works best (no white box around your signature)
- Free, no signup required, no watermarks
Frequently asked questions
Is this a legally-binding e-signature?
It's a visible signature stamp — what the law in most places calls a 'simple electronic signature'. Acceptable for most everyday contracts (employment, NDAs, leases, B2B agreements). For high-stakes contracts requiring 'qualified e-signatures' (notarized, government-grade audit trail), use DocuSign or Adobe Sign — those provide cryptographic signing certificates and tamper-evident audit trails. PDFOnly produces the visual signature; for cryptographic certificates, use a dedicated e-sign service.
What's the best image format for my signature?
PNG with transparent background. To make one: sign on white paper, photograph or scan it, remove the white background using a tool like remove.bg or Photoshop's magic wand, save as PNG. The result drops cleanly onto any document with no visible box around your signature.
Can I draw my signature directly in the browser?
Drawing a signature with mouse/trackpad/touch is on the roadmap. For now, the cleanest result is a photographed/scanned PNG of your handwritten signature.
Can I sign multiple pages at once?
You can place the same signature image on multiple pages by repeating the click-to-place step on each page. The editor remembers all placements until you submit. Useful for contracts that require initials on every page.
Will the signature be permanently part of the PDF?
Yes — once you click Sign and Download, the signature is flattened into the page. Recipients can't drag it off or recover the unsigned version. (If you need an audit trail of who-signed-when, use a dedicated e-sign service that creates that record cryptographically.)
Are my signed PDFs private?
Yes. The PDF and your signature image both upload over HTTPS, are processed in isolated workers, and auto-delete in one hour. We never train AI models on customer documents.
Can I sign a password-protected PDF?
Not while it's encrypted. Use Unlock PDF first with the password, then sign the unlocked version. After signing, you can re-protect it with Protect PDF if needed.
Ready to sign pdf?
Free to use for the basics. Files are auto-deleted within an hour and never used to train AI.
Open Sign PDF