Privacy · September 19, 2026 · 4 min read
How to sign a PDF without uploading it anywhere
Most online signing tools copy your document to their servers first. Here is how to sign one that never leaves your device — and how to check that for yourself.
Almost every online PDF signer works the same way. You pick a file, it is uploaded to the company's servers, the signature is applied there, and you download the result. Your contract, payslip or medical form now exists on a machine you know nothing about, kept for as long as their retention policy says — if you ever read it.
For a lunch-order form, nobody cares. For an employment contract, a lease with your ID number on it, or an unsigned acquisition agreement, it is the whole question.
Signing in the browser instead
A modern browser can do everything a signing server does. It can open a PDF, draw it on screen, place a signature image on the right page at the right coordinates, and write out a new PDF file. None of that needs a server.
That is how esign.website works. The document is read by your browser, rendered with pdf.js, signed with pdf-lib, and saved straight back to your device. The file is never sent to us, which also means we could not show it to anyone, lose it in a breach, or keep it longer than we should. We never had it.
How to do it
Open esign.website/sign and drag your PDF onto the page. It appears immediately, because nothing is being uploaded.
Create a signature — draw it, type it in a script font, or upload a picture of your real one — and it appears on the page, ready to drag into place. The toolbar above the page adds a date, initials or a text field if the document needs them.
Click Download PDF and choose a copy. The signed PDF is built on your machine and saved to your Downloads folder. Standard PDF is free and carries an esign.website watermark across every page; Clean PDF is $1.
Don't take our word for it — check
Any site can claim it never uploads your file. The good news is that this one is easy to verify, and you do not need to be technical to do it.
Open your browser's developer tools (F12 on Windows, Cmd+Option+I on a Mac) and choose the Network tab. Now open and sign a document. You will see the page download the things it needs to display a PDF — scripts, fonts — but no request that sends your file anywhere. Signing a large PDF makes it obvious: there is no multi-megabyte upload, because there is no upload.
Do the same on a tool that uploads, and you will see the file go out in the first second.
What does leave your device
Being precise about this matters more than the headline, so here is the complete list. If you are signed in, the signatures you create are saved to your account so they follow you between devices, and each download records the file's name, page count, date, the browser you used and a SHA-256 fingerprint of the signed PDF — never its contents. If you buy without an account, we keep the email address you give us so the purchase can be restored.
If you are signed in when you download, we record the file's name, its page count, the date and a SHA-256 fingerprint of the signed PDF — never its contents. That is what lets the document show up in your dashboard and be checked at /verify.
If you use Send to Sign to get someone else's signature, the document is uploaded to our storage so they can read it, and the signed copy is kept with it until you delete the request. That is the one feature where the file leaves your device, and it is the only one.
Paying goes through PayPal, who see your payment details and not your document. Google Analytics records which pages were visited and a few anonymous events — a file's size and page count, which download you chose — never the file or its name. In the EU, UK and Switzerland it sets no cookie until you accept, though Google still receives a cookieless signal that a page was viewed.
When uploading is the right call
Browser-only signing has one real limit: it cannot collect several people's signatures on one document in a fixed order, because that needs somewhere for the document to wait between signers. If that is what you need, a cloud tool like DocuSign or Dropbox Sign is the right choice, and uploading is simply the price of the feature.
For everything else — signing your own copy of a contract, a lease, an NDA, a permission slip — there is no reason the document should ever leave your computer.