Printing a document just to sign it and scan it back is a waste of time. You can sign a PDF directly online in under a minute. Here’s how.
The Fastest Method
- Go to pdftoolshq.com/sign-pdf
- Upload your PDF
- Upload your signature image (PNG with transparent background works best)
- Set the position and size on the page
- Download the signed PDF
The whole process takes less than a minute.
Creating Your Signature Image
You need a signature as an image file. Three ways to get one:
Phone camera — sign on white paper, photograph it, crop tightly. Works fine for most purposes.
Touchscreen — on a phone or tablet, open any drawing app, sign with your finger, screenshot and crop.
Transparent PNG — for a cleaner result, use a free tool like remove.bg to strip the white background from your signature photo, leaving just the signature on a transparent background. This looks more professional on coloured or patterned document backgrounds.
Where to Position Your Signature
Most signature fields are at the bottom of the last page. When using the sign tool, set:
- Page — the page number where the signature belongs (usually the last page)
- X and Y position — coordinates from the top-left corner of the page. If unsure, start with X: 350, Y: 650 for a bottom-right position on a standard A4 page and adjust from there
- Width and Height — typically 150-200px wide, 60-80px tall for a natural-looking signature
Is a Digital Signature Legally Valid?
For most everyday purposes — signing contracts, approving documents, internal business paperwork — yes. An image signature on a PDF is legally accepted in most jurisdictions for standard commercial agreements.
For high-stakes legal documents (property transactions, court filings, certain financial instruments), you may need a certified digital signature with a certificate chain. That’s different from an image signature and requires dedicated signing platforms like DocuSign or Adobe Sign.
For the vast majority of business documents, an image signature is perfectly valid and widely accepted.
Signing Multiple Pages
If a document requires initials on every page plus a full signature on the last page, process the file twice — once for initials (positioned at the bottom of each page) and once for the final signature. Or use the watermark tool with your initials as a subtle footer across all pages, then add the full signature separately.
After Signing
Once signed, consider password protecting the PDF before sending — this prevents the recipient from modifying the document after you’ve signed it.