Sign a PDF Online Free — No Signup, No Watermark

Upload your PDF, then add your signature by drawing it, typing your name in a signature style, or uploading a photo or scan of your existing signature. Place it on the signature line, use the text tool to fill in the date and any other fields, and download the signed PDF — free, with no signup and no watermark.

An electronic signature is a visual mark that represents your intent to sign — a drawn squiggle, a typed name, or an image of your handwriting placed on the page. That is what this tool adds, and it is what the overwhelming majority of signed PDFs contain. A digital signature is a different thing wearing a similar name: a cryptographic seal, created with a certificate issued to you, that mathematically binds the signature to the exact bytes of the document, so any later change to the file is detectable. Digital signatures require a certificate from a certificate authority or your organisation, and are applied with software configured for it — Acrobat, a government e-ID application, or an enterprise signing platform. If a contract or tender specifically demands a "digital signature" or a "qualified electronic signature", it means the cryptographic kind and this tool is not the right one for it.

Because the document carries a cryptographic digital signature, and something in the file changed after that signature was applied. The signature covers the exact bytes of the document as it stood at signing, so any later modification — adding a signature of your own, filling a field, flattening it, or re-saving through most tools — makes the stored hash stop matching and the viewer reports it as invalid. That warning is the mechanism working correctly, not a fault. If you need to add something to a document that is already digitally signed, the right route is to ask the sender for an unsigned copy, complete it, and have it signed once at the end. Some signed PDFs permit specific later changes such as form filling; whether yours does was decided by whoever signed it.

Not with this tool, and you should be wary of anything that offers to. A cryptographic signature exists to prove the document has not changed since a named person approved it, so stripping it out to keep editing defeats the point and leaves you with a file that no longer proves what it claims. If the document needs to change, get a new copy from the signer and have the final version signed. If you only need the content for reference, extract what you need rather than altering the signed original.

In most jurisdictions electronic signatures are recognised for ordinary business and personal agreements — the US ESIGN Act and UETA, the EU eIDAS regulation, and comparable laws elsewhere all give them legal effect. What varies is the standard of proof required, and certain categories such as wills, some property transfers, and some court filings are commonly excluded and need a handwritten or notarised signature. Higher-value or regulated agreements may specifically require a qualified electronic signature, which is the certificate-based kind. This is general information rather than legal advice — if a document matters, check what the receiving party actually requires before signing it.

No. There is no signup wall and nothing to install. Open the page, drop in a PDF, and sign it. Unlike the large e-signature platforms, there is no per-document charge and no free-trial countdown for a one-off signature.

Yes — all three work. You can draw a signature with a mouse, trackpad, or finger, type your name and have it rendered in a signature style, or upload a PNG or JPG of your existing handwritten signature. An uploaded image usually looks the most convincing on a formal document; drawing is quickest on a touch screen.

Yes. Use the text tool to complete name, date, address, and detail fields, then place your signature before exporting. The whole document is finished in one session rather than being signed and then sent back for the missing fields.

Yes, and drawing a signature with a finger on a touch screen generally looks better than drawing one with a mouse. The page runs in Safari on iPhone and iPad and in Chrome on Android with nothing to install. Save the PDF to your device first — on iPhone, open the attachment and choose Save to Files — then upload it here.

On the signature line itself, sized so it sits within the line rather than crossing into the text above or below. Add the date in the adjacent field if the document has one; many agreements treat an undated signature as incomplete. If the document has several signature blocks, check whether any of them are meant for the other party before filling them in.

No watermark, ever. The exported PDF is clean and ready to send, print, or upload to any document system.

Your file is used only to perform your edit and is not retained after your session ends. See the Security and File Handling pages for the full details.