Encrypt PDF Privately
Encrypt PDF privately with ContinuePDF, where your PDF is processed entirely inside your own browser and never uploaded. For sensitive documents — contracts, medical records, tax forms, IDs — the safest tool is one that physically cannot see your file. Because the encrypt step runs locally, there is no server copy to leak, subpoena, or breach.
Start Encrypt PDF NowHow to Encrypt PDF Privately
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Open the tool (optionally go offline)
Load Encrypt PDF once. You can even disconnect from the internet afterwards — it still works.
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Add your PDF locally
Your file is read into the browser tab on your device. It is not transmitted anywhere.
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Download and close the tab
Save password-protected PDF. Closing the tab clears the file from memory — no trace is left behind.
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.
How ContinuePDF keeps Encrypt PDF private
Most online PDF tools follow the same pattern: your file is uploaded to a server, processed there, and a link to the result is sent back. That means a copy of your document sits on someone else's computer, at least temporarily — and you have to trust their retention policy, their staff, and their security. For confidential material, that is a real risk.
ContinuePDF uses client-side processing instead. The code that performs the encrypt operation is downloaded to your browser and runs there, on your machine. Your PDF stays in local memory for the seconds it takes to produce password-protected PDF, then vanishes when you close the tab. We never receive the file, so there is nothing on our side to expose.
Why choose ContinuePDF
Never uploaded
Your document stays on your device from start to finish.
No server copy
Nothing to retain, leak, or hand over — we never hold your file.
Works offline
Once loaded, the tool runs with the network disconnected.
Auto-cleared
Closing the tab wipes the file from memory automatically.
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.
Is it safe to encrypt confidential PDFs here?
Yes — arguably safer than most alternatives. Because your PDF is processed in your browser and never uploaded, there is no server-side copy of your confidential document. You can even run the tool with your internet disconnected once the page has loaded.
Can ContinuePDF staff see my document?
No. The file never reaches us. All encrypt processing happens locally on your device, so we have no access to your document's contents at any point.
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.
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