Encrypt PDF
Protect PDF files directly in your browser with AES-256 encryption, no upload, and optional permissions.
Input
Private by design: your PDF files and passwords never leave your device.
Security
Use at least 16 characters and no reused password.
Good to know
Good to know
The PDF encryptor protects PDF files with AES-256 encryption directly in your browser. Simple mode needs only an opening password with an automatically generated, unstored owner password; Advanced mode allows a custom owner password and granular restrictions on printing, editing, and copying.
Typical searches include encrypt PDF, add PDF password, and protect PDF. A strength indicator recommends at least 16 characters without reuse. Important: permissions such as print or copy restrictions are not DRM and can be ignored by non-compliant software. Encrypted PDFs are also not PDF/A compliant, and existing digital signatures become cryptographically invalid.
Typical use cases
Quickly protect confidential documents with a password
Use Simple mode for an opening password when you don't need granular restrictions — all normal PDF functions remain allowed.
Selectively restrict printing or editing
Switch to Advanced mode to limit printing to low resolution, or to individually allow or block editing, annotating, and copying.
Tips for better results
Use a strong, unique password
Use at least 16 characters and a password you haven't reused elsewhere — a forgotten opening password cannot be recovered reliably.
Check PDF/A and signatures before encrypting
If PDF/A compliance or valid digital signatures matter, encrypt only after completing all archiving or signing steps.
How it works
How it works
Step by step
Features
Features
AES-256 encryption
Each source becomes a new AES-256 encrypted PDF file, locally.
Simple and Advanced modes
Choose a single opening password or granular permissions for printing, editing, and copying.
Password strength indicator
A strength indicator (weak/medium/strong) helps you choose a sufficiently secure password.
Frequently asked questions
Frequently asked questions
Are permissions like a copy restriction secure?
No. Permissions are evaluated by PDF readers, but they are not DRM and can be ignored by some software.
Does a digital signature stay valid after encryption?
No. Encryption creates a new PDF file; existing digital signatures become cryptographically invalid.
More tools
More tools
Unlock PDF
Remove known PDF password protection directly in your browser with no upload and batch processing.
Compress PDF
Reduce PDF file sizes locally in your browser with no upload and clear quality controls.
Merge PDF
Merge multiple PDF files locally in your browser into one new PDF using a custom order.
Delete PDF Pages
Delete pages from one or more PDF files locally in your browser and create new PDFs.