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Sign a PDF without uploading the document or your signature.
Two things leave your device on most signing sites. Here, neither does.
What an online signing service actually collects
Signing a document on a website means handing over two things, not one. The first is the contract, which is confidential by default. The second is an image of your signature — a reusable artefact that identifies you, and one you have no way of retrieving once it sits on someone else's server.
That second part is the one people do not think about. A signature image is exactly the kind of thing that should not accumulate in databases you do not control, and the standard model puts it in one every time you sign.
What happens here instead
You draw the signature on a canvas in the tab, or type a name and choose a rendered style. It becomes a transparent image, is embedded into the page with pdf-lib, and is written into the document you download. No image of your signature is stored anywhere — including here. Close the tab and it is gone.
The document is handled the same way. It is read into memory, the signature is placed, and the result is saved to your device. There is no upload endpoint in the code.
How to verify
Developer tools → Network → sign a document. No request carries the file and none carries the signature image. The method is the same for any site.
Open DevTools → Network → run a conversion. There is no upload endpoint to receive a file.
What this is, and is not
This applies a visible signature to the page. Electronic signatures of that kind are recognised for ordinary agreements under laws such as eIDAS in the EU and the ESIGN Act in the US, and a drawn signature applied with clear intent is a common form of one.
It is not a certificate-based digital signature and it produces no audit trail. Some documents require those, and some counterparties insist on them regardless. If yours does, you need a service built for that — and it will, necessarily, involve a server. Where a visible signature is what is being asked for, which is most leases, most forms, and most ordinary contracts, this does the job without the upload.
Common questions
Can I sign a PDF without uploading it?
Yes. The document and the signature image are both handled in your browser tab and never transmitted. You can confirm that in the Network panel.
Is my signature image saved anywhere?
No. It exists in the tab while you work, is embedded into the PDF you download, and is not stored here or sent anywhere.
Is a signature added this way legally binding?
It can be, for ordinary agreements, under laws such as eIDAS and the ESIGN Act. Requirements vary by jurisdiction and document type, and some require a certificate-based signature instead. Check what yours asks for.
Is this a digital signature with an audit trail?
No. It is a visible signature image. If your counterparty requires a certified digital signature, use a service built for that.
Can I sign on a phone?
Yes. Drawing with a finger usually produces a better signature than a trackpad.
Tools on this page
- Sign PDF — Draw or type a signature and place it on a page.
- Watermark PDF — Stamp DRAFT, CONFIDENTIAL, or your own text.
- Merge PDF — Combine PDFs in any order, in this tab.