Sign a PDF — without uploading it

Signing is the worst possible moment to hand a document to a third party, because the documents that need signatures are the ones that matter: employment contracts, NDAs, tenancy agreements, consent forms, invoices. Uploading one to a free signing site means the contract and an image of your handwritten signature both land on someone else's infrastructure. A signature image is reusable by whoever holds it.

Neither leaves your device here. You draw or paste the signature in the page, and it is stamped into the PDF by code running in your own tab. There is no backend on this site to receive either the document or the signature, and a Content-Security-Policy blocks third-party requests. Load the page, disconnect from the network, and you can still sign.

• Draw it — with a mouse, a trackpad, or a finger on a touchscreen. A phone or tablet gives by far the most natural result.
• Upload an image — a PNG or JPEG of a signature you signed on paper and photographed. A PNG with a transparent background sits most cleanly on the page.
• Paste it — copy an image anywhere on your system and press Cmd/Ctrl+V over the upload box.

Once it exists, drag it into position on the page and resize it with the corner handle. A signature from a photo generally looks better after a moment in an image editor to crop tightly and drop the background — the image converter can convert and resize it on your device first.

Contracts usually need more than one signature. Add as many as you need — each party draws or uploads their own — then select whose signature you are placing and drop it where it belongs. That covers the common case of two or three people signing the same agreement without passing the file through a service that charges per envelope.

Long documents are handled with the page film strip: switch pages and place any signature on as many of them as you like before downloading. Initialling every page of a lease works the same way as signing the last page of a letter. Nothing is written to a file until you download, so placements can be adjusted freely.

Be clear about what this is: it places a picture of your signature onto the page, exactly like signing a printout and scanning it. It is not a certificate-based cryptographic digital signature, and it does not embed a signing certificate or a tamper- evident hash of the document.

For the large majority of everyday paperwork that distinction does not matter — many jurisdictions accept an image-based electronic signature where both parties agree, and this is the same standing a scanned signature has always had. Where you need cryptographic non-repudiation, a qualified timestamp, or an auditable signing trail — some regulated, governmental, or high-value transactions — you need a certificate-based signature from a trust service provider instead. This is not a substitute for that, and anyone telling you a drawn image is equivalent is wrong.

If the signed result should not be editable afterwards, Protect PDF adds password encryption on your device, and Watermark PDF can stamp it as a copy or a draft.