Sign PDF Online — Free, No Upload, Draw Your Signature
Draw your signature with mouse or finger and apply it to any PDF. Files never leave your device.
How to Sign a PDF Online for Free
You don't need Adobe Acrobat, a printer, or a scanner to sign a PDF. PDFZen4u's Sign PDF tool lets you draw your signature using your mouse or touchscreen and embed it directly into the document — all in your browser.
Upload your PDF
Drop your PDF into the upload zone. The pages load as thumbnails.
Draw your signature
Use your mouse or finger on the signature canvas. Choose colour and pen thickness. The hint disappears when you start drawing.
Choose position and download
Select which page and where to place the signature (bottom right, bottom left, etc.). Click Apply Signature — your signed PDF downloads immediately.
Is a drawn signature legally valid?
In most jurisdictions, a handwritten digital signature is legally valid as an electronic signature under laws like the EU eIDAS regulation, the US ESIGN Act, and the UK Electronic Communications Act. For documents requiring a qualified electronic signature (QES) — such as certain legal contracts or official government documents — you may need a certificate-based signature from a trusted authority.
FAQ
How electronic PDF signing works
Signing a PDF online places an image of your signature onto the page at the position you choose. PDFZen4u lets you draw your signature with a mouse or finger, type it in a signature-style font, or upload an image of your handwritten signature. The signature is then embedded into the PDF as part of the page. Because everything happens in your browser, your signature image is never uploaded to a server — an important point given how sensitive a signature is.
When an electronic signature is enough
For the vast majority of everyday documents — internal approvals, supplier forms, rental applications, permission slips, delivery confirmations — a simple electronic signature like this is perfectly acceptable and saves the hassle of printing, signing, and scanning. It is worth knowing the distinction between this kind of visible signature and a cryptographic digital signature, which uses a certificate to legally bind the signer's identity. For high-stakes legal contracts, check whether the other party requires a certificate-based signature.
Reusing your signature
PDFZen4u can remember your signature in your browser so you do not have to redraw it every time. This is stored locally on your own device, never on a server, and you can clear it whenever you like. For people who sign documents regularly — landlords, freelancers, managers — this turns a repetitive chore into a two-click task.
Placing the signature correctly
Most forms have a signature line, often near a printed name and a date field. Position your signature so it sits on the line without covering the printed text beneath it. If the form also needs the date, add that as a separate text element next to your signature. When signing multiple pages, check whether every page needs a signature or just the final one — many contracts require initials on each page and a full signature at the end.
Why signing locally matters
Your signature is a piece of personal identity data. Uploading it to an online service means handing a copy of your signature to a company you may know nothing about. By keeping the entire process inside your browser, PDFZen4u ensures your signature and the document you are signing never leave your computer. This is especially important for contracts and financial agreements where both your signature and the document contents are confidential.