Encrypt & Protect PDF
Lock your PDF with a password and apply usage restrictions. Everything happens locally in your browser.
How protection works
Required to open the file. Anyone without it cannot view the PDF.
Honored by Adobe Acrobat, Preview, and major browsers. These are advisory protections, not absolute — a determined attacker can strip them with specialised tools.
*-protected.pdfKey Features
Standard PDF Password
Output a regular .pdf file that prompts for a password in Acrobat, Preview, Chrome, or any other reader.
AES-256 Envelope
Wrap the PDF in a Web Crypto envelope for the highest possible secrecy in transit. Re-open here to restore.
Real Permission Locks
Restrict printing, copying, and editing — enforced inside the PDF itself with a tamper-resistant owner secret.
Zero-Knowledge
Your password is processed only by your browser via the native Web Crypto API. We never see it.
Fully Local
No upload, no server processing. Encryption happens on your device and the file is downloaded directly.
Unlock Any Protected PDF
Upload a password-protected PDF or our .pdf.enc envelope — the tool auto-detects and removes the lock.
How It Works
Upload Your PDF
Drag and drop the PDF you want to protect. It stays in your browser the entire time.
Choose Encryption Method
Pick standard PDF password (universal compatibility) or AES envelope (maximum secrecy in transit).
Set Password & Restrictions
Add a password and toggle which actions readers may perform: print, copy, or edit.
Encrypt & Download
Click Protect PDF. Your file is encrypted and saved locally. Keep your password safe!