Encrypt PDF Online
Encrypt PDF online with ContinuePDF — no installer, no plug-in, no desktop software to keep updated. The whole tool loads as a web page, so you can encrypt your PDF straight from any computer or phone that has a browser. Because the work runs on your own machine instead of a remote server, you get desktop-class speed without the desktop-class download.
Start Encrypt PDF NowHow to Encrypt PDF Online
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Open the tool in your browser
Go to continuepdf.com and open Encrypt PDF. There is nothing to install — the page is the app.
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Add your PDF
Drag files onto the page or click to browse. Everything loads into the browser tab, not a server.
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Encrypt PDF and download
Run the tool and save password-protected PDF to your device. The result is generated locally and downloaded instantly.
What you can do with Encrypt PDF
Encrypting a PDF locks it with a password, so the document can only be opened by someone who knows it — protecting sensitive files when they are shared, emailed, or stored somewhere less secure.
Protect financial documents
Password-protect bank statements, tax returns, or payslips before sending them.
Secure an email attachment
Add a password so a confidential file is useless to anyone who intercepts the email.
Lock personal records
Encrypt medical results, contracts, or IDs kept on a shared or cloud drive.
Share on a need-to-know basis
Give the password only to intended recipients so others cannot open the file.
Why an online Encrypt PDF tool beats desktop software
Traditional PDF programs like Acrobat or dedicated encrypt utilities have to be downloaded, installed, licensed, and updated — and they only work on the one machine you installed them on. An online tool skips all of that: open a URL and you are working. That matters most on borrowed, locked-down, or brand-new computers where you can't install anything.
The usual trade-off with "online" tools is privacy, because most of them upload your document to a server to process it. ContinuePDF is different — the encrypt operation happens inside your browser using JavaScript and WebAssembly, so your PDF never leaves your device even though the tool lives on the web. You get the convenience of online with the privacy of offline.
Why choose ContinuePDF
Nothing to install
Works the moment the page loads — no setup, no admin rights.
Any device
Encrypt PDF from a laptop, desktop, tablet, or phone with the same link.
Always up to date
You always run the latest version — there is no old build to patch.
Processed locally
Online convenience, but files stay in your browser, not on a server.
Pro tip
Use a strong, unique password and send it to the recipient through a different channel than the file itself — for example, email the PDF but share the password by message or phone. Do not lose the password; without it, the file cannot be opened.
Frequently asked questions
What happens if I forget the password?
There is no back door — a forgotten password means the file cannot be opened. Keep the password somewhere safe, ideally in a password manager.
Does encryption protect the file everywhere?
Yes. The password requirement is part of the PDF itself, so any compliant reader on any device will ask for it before showing the contents.
Do I need to install anything to encrypt a PDF online?
No. Encrypt PDF runs entirely as a web page. You open the link, add your PDF, and download password-protected PDF — there is no program to download, no extension to add, and no account to create.
Does an online tool mean my file is uploaded somewhere?
Not with ContinuePDF. Although the tool is delivered over the web, the actual processing runs inside your browser on your own device. Your document is never transmitted to or stored on our servers.
Is ContinuePDF free to use?
Yes. ContinuePDF and all of its tools, including Encrypt 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 Encrypt PDF
Prefer a different device, browser, or setup? Encrypt PDF works the same everywhere.
Ready to Encrypt PDF?
Start using our free encrypt tool now — no signup required.
Open Encrypt PDF Tool