PDF Tools
Password Protect PDF — Encrypt Without Uploading
🔒 Runs in your browser
Add a password to a PDF using strong AES encryption, entirely in your browser. The file is encrypted on your device and never uploaded — so protecting a confidential document does not mean handing it to a server first. No account required.
How to use this tool
- Select your PDF file.
- Enter the password you want to apply.
- Download the AES-encrypted PDF — the file never leaves your device.
Drop a PDF to password-protect
Your files never leave your browser. How it works
Next step
Frequently Asked Questions
- Are my files uploaded?
- No. Encryption runs in your browser via a WebAssembly build of qpdf. Your file never leaves your device.
- What encryption is used?
- AES-256. Anyone opening the PDF afterwards must enter the password you set.
- What if I forget the password?
- It cannot be recovered — that is the point of encryption. Store it somewhere safe.
Sharing this document with EU contacts?
If it contains personal data, GDPR compliance is mandatory. EuroComply helps you check quickly.
How to Password Protect a PDF for Free (No Upload)
Add AES-256 encryption to a PDF in your browser — no file upload, no account. The file is encrypted locally; no server receives the document or password.