Encrypt PDF on Windows
Encrypt PDF on Windows without installing desktop software — ContinuePDF runs in Edge, Chrome, or Firefox on any Windows 10 or 11 PC. Skip the Adobe download and the "trial expired" prompts and encrypt your PDF straight from your browser. Because it needs no installation, it works even on locked-down work or school computers where you can't install programs.
Start Encrypt PDF NowHow to Encrypt PDF on Windows
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Open the tool in your browser
On your Windows PC, open Encrypt PDF in Edge, Chrome, or Firefox. No install, no admin rights.
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Add your PDF from File Explorer
Drag files from a File Explorer window onto the page, or click to browse your PC.
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Download the result
Process the file and password-protected PDF saves to your Downloads folder.
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.
Encrypt PDF on Windows without extra software
Windows doesn't include a built-in tool to encrypt PDFs, so people usually reach for Adobe Acrobat or one of many downloadable utilities — which means installers, licenses, update nags, and sometimes bundled extras you didn't want. On a managed work or school PC you often can't install anything at all.
ContinuePDF sidesteps all of that. It runs in the browser that ships with Windows (Edge) as well as Chrome and Firefox, with nothing to install and no admin password required. Drag your PDF in from File Explorer, encrypt it, and download password-protected PDF — and because it is all local, your documents never leave the PC.
Why choose ContinuePDF
No installer
Runs in Edge, Chrome, or Firefox — no download, no admin rights.
Works on locked PCs
Ideal for work or school computers where you can't install software.
File Explorer drag-drop
Drop files straight from a File Explorer window.
Stays on your PC
Files are processed locally and never uploaded.
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.
How do I encrypt a PDF on Windows?
Open Encrypt PDF in Edge, Chrome, or Firefox on your Windows PC, drag your PDF in from File Explorer, run the tool, and password-protected PDF saves to your Downloads folder. No installation needed.
Can I use this on a work computer that blocks installs?
Yes. Because Encrypt PDF runs entirely in the browser with no installation, it works on managed Windows PCs where you don't have permission to install software.
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.
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