Printing a document just to sign it and scan it back is one of the more annoying rituals of modern life. You don’t have to. Signing a PDF digitally takes seconds, looks clean, and — done right — keeps your document completely private.
What it means to sign a PDF
Signing a PDF simply means adding your signature onto the document as an image, placed where the signature line is. You draw it, type it, or upload a picture of your real signature, position it, and save. The result is a signed document you can email straight back — no printer, no scanner.
Three ways to add your signature
- Draw it — use your mouse, trackpad, or finger on a touchscreen. On phones this feels the most natural.
- Type it — enter your name and pick a handwriting-style font. Fast and tidy.
- Upload it — snap a photo of your signature on paper and place that. pdflu can even remove the white background so only the ink shows.
How to sign a PDF, step by step
- Open the sign tool. Go to pdflu’s Sign PDF tool — everything happens in your browser.
- Upload your PDF and create your signature by drawing, typing, or uploading.
- Place it. Drag your signature to exactly where it belongs and resize it to fit.
- Download your signed document, ready to send.
Is a drawn signature legally valid?
For many everyday agreements — consent forms, internal approvals, informal contracts — a drawn or typed electronic signature is widely accepted. That said, rules vary by country and document type, and high-stakes contracts sometimes require a certified digital signature (a cryptographic kind, different from a signature image). For anything legally significant, it’s worth checking what’s required. This guide is general information, not legal advice.
Why signing privately matters
The documents people sign — contracts, agreements, forms — are often exactly the ones you’d least want sitting on a stranger’s server. Many online signing services upload your file to do the work. pdflu signs your PDF entirely in your browser, so a sensitive document never leaves your device. If privacy matters to you, that difference is worth caring about.
The bottom line
Signing a PDF digitally is faster, cleaner, and (with the right tool) more private than the print-sign-scan routine. Draw, type, or upload your signature, place it, and you’re done. Try it free with pdflu’s Sign PDF tool.
Frequently asked questions
How do I add my signature to a PDF for free?
Open pdflu's Sign PDF tool, upload your document, then draw, type, or upload your signature. Place it where you want and download the signed file. It is free with no watermarks.
Can I sign a PDF on my phone?
Yes. On a touchscreen you can draw your signature with your finger, which usually looks more natural than a mouse. The whole process works in your mobile browser.
Is an electronic signature on a PDF legally binding?
For many everyday documents, yes, but it depends on your country and the document type. Certified cryptographic signatures may be needed for high-stakes contracts. Check the specific requirements for important documents.
Can I upload a photo of my real signature?
Yes. pdflu lets you upload an image of your signature and can remove the white paper background so only the ink appears on your document.
Does signing a PDF online keep my document private?
With pdflu it does, because signing happens entirely in your browser and your document is never uploaded to a server.