Protect PDF
Add a password to your PDF. AES-256 encryption runs entirely in your browser — your file never leaves your device.
This tool applies AES-256 password protection (PDF 2.0 standard), which is supported by Acrobat, Preview, and all current PDF viewers. The password controls opening the document. Separate permissions passwords are not supported.
Click to upload or drag and drop
PDF files only
How it works
- 1. UploadSelect the PDF you want to protect.
- 2. Set passwordEnter the password that will be required to open the file.
- 3. DownloadYour encrypted PDF is generated in the browser and downloaded immediately. Nothing is uploaded to any server.
Frequently asked questions
- What encryption does this tool use?
- AES-256 encryption using the PDF 2.0 standard (/V5 /R6). This is supported by Adobe Acrobat X and later, Apple Preview, and all current PDF viewers.
- Are my files uploaded to a server?
- No. Encryption runs entirely in your browser using the Web Crypto API. Your PDF never leaves your device.
- Can I set separate owner and user passwords?
- No. This tool sets a single open password. Separate permissions passwords are not supported.
- What happens if I forget the password?
- There is no way to recover a forgotten password. Keep a record of the password you set.