Drop pdf file here or
Your files are secure
Upload the PDF, set a strong password, download the protected file. Encryption happens locally — nothing is uploaded.
Drag & drop your PDF, or click Choose Files to browse.
Set a strong password — the longer and more mixed, the stronger the protection.
Click Protect and the document is encrypted instantly, right in your browser.
Download your protected PDF free — and the unencrypted original never left your device.
Built for speed, privacy and reliability — on any device.
Standard PDF encryption means anyone without the password sees nothing but a prompt — not a preview, not a page.
Lock down printing, copying and editing permissions so the document is read, not misused.
Encryption happens on your device. The unencrypted file never touches any server.
Uses the PDF standard's encryption — the same protection enterprise tools rely on.
Protect as many documents as you need at zero cost — no account, no limits, on any device.
Then the content is effectively unreachable — standard PDF encryption has no backdoor. Store the password in a password manager, and keep the unprotected original somewhere safe until you're sure.
Yes. Alongside the open password, permission settings can restrict printing, text copying and modifications — recipients get exactly the access you grant.
Yes — standard PDF encryption is well-established and suitable for contracts, financial documents and internal reports. Use a long password and the protection holds.
Yes — our Unlock PDF tool removes protection when you have the password, which is the normal flow for updating or re-securing a document later.
The tool works in all modern browsers including Google Chrome, Mozilla Firefox, Microsoft Edge, Safari and Opera. We recommend keeping your browser up to date for the best experience.
Protect PDF files with a password