Sign PDF Securely
Sign PDF securely with ContinuePDF's client-side tool, built so your data never travels across the network in the first place. Security isn't only about encryption in transit — it is about minimizing who can touch your file at all. By running the sign operation on your device, ContinuePDF removes the server from the equation entirely.
Start Sign PDF NowHow to Sign PDF Securely
-
1
Load the tool over HTTPS
Open Sign PDF on continuepdf.com. The page itself is served securely, then runs on your device.
-
2
Process your PDF on-device
The sign step executes in your browser sandbox — no upload, no transmission.
-
3
Save your result
Download signed PDF directly. It was generated locally and never left your machine.
What you can do with Sign PDF
Signing adds your actual signature to a PDF — drawn, typed, or uploaded as an image — and places it exactly where the document needs to be signed, so you can return it without printing.
Sign a contract fast
Add your signature to an agreement and send it back the same day, with no scanner or printer needed.
Handle forms remotely
Sign school, medical, or HR forms from home and email the signed copy straight back.
Initial every page
Place your initials on each page of a multi-page contract where that is required.
Reuse a saved signature
Sign recurring paperwork with a consistent, professional-looking signature every time.
A more secure model for Sign PDF
The weakest point in most online PDF workflows is the round trip to a server: the upload can be intercepted, the server can be compromised, and copies can linger in logs, caches, or backups long after you are done. Adding TLS helps in transit, but it doesn't protect the copy that ends up sitting on the provider's disk.
ContinuePDF's approach is to not send the file anywhere. The sign logic runs inside your browser's sandbox, isolated from other sites and from the wider system. Your PDF exists only in your device's memory while the tool works, which shrinks the attack surface to essentially zero — there is no server component to breach.
Why choose ContinuePDF
No transmission
The file is never sent over the network, so it can't be intercepted.
No retention
Nothing is stored server-side — no logs, caches, or backups of your file.
Sandboxed
Processing runs inside the browser's isolated security sandbox.
Minimal surface
No server component means there is nothing on our side to attack.
Pro tip
Draw your signature slowly on a trackpad or touchscreen for a cleaner line, or upload a photo of your ink signature on white paper for the most authentic look. Size it to match the signature line rather than dropping it in oversized.
Frequently asked questions
Is a signature added this way legally valid?
In many places an electronic signature is acceptable for everyday agreements, but requirements vary by country and document type. For high-stakes legal documents, check what your jurisdiction or the other party requires.
Can I place the signature exactly where I want it?
Yes. You position and resize the signature freely, so you can drop it precisely on the signature line and add a date next to it if needed.
How is this more secure than other Sign PDF tools?
Most tools upload your file to a server, creating a copy that can be intercepted, logged, or breached. ContinuePDF processes your PDF inside your browser, so the document is never transmitted and no server-side copy is ever created.
Are my files stored anywhere after I sign them?
No. Because the file never leaves your device, there is nothing stored on our end. The document lives only in your browser's memory during processing and is cleared when you close the tab.
Is ContinuePDF free to use?
Yes. ContinuePDF and all of its tools, including Sign PDF, are free with no signup required. Because documents are processed in your browser rather than on our servers, we can offer the full feature set at no cost.
Other ways to Sign PDF
Prefer a different device, browser, or setup? Sign PDF works the same everywhere.
Ready to Sign PDF?
Start using our free sign tool now — no signup required.
Open Sign PDF Tool