How to use this tool
- Drop in a PDF.
- Type a password and confirm it.
- Click "Protect PDF" — the encrypted file downloads automatically.
Common mistakes to avoid
- There's no password recovery — if you forget it, the PDF can't be opened again. Keep it somewhere safe.
Frequently asked questions
- Is my PDF uploaded anywhere?
- No — encryption happens entirely in your browser using qpdf compiled to WebAssembly. The file, and the password you set, never leave your device.
- What encryption does this use?
- AES-256, the current strongest standard PDF encryption level — the same strength used by paid PDF protection tools.
- What if I forget the password?
- There's no way to recover it — encryption that could be undone without the password wouldn't be real protection. Keep it somewhere safe.
How GetByteRush compares
Most free tools for this online work the same way: you upload your file to their server, wait, then download the result — which means your file (and often your email, for a "free" account) sits on someone else's infrastructure. Here's the actual difference:
| Feature | GetByteRush | Typical online tools |
|---|---|---|
| PDF ever leaves your device | No — encrypted in this tab | Yes, uploaded to process |
| Encryption strength | AES-256 | Varies, often lower on free tiers |
| Account required | Never | Often, past a certain usage level |
("Typical online tools" reflects publicly documented behavior of common free file-processing sites as of 2026 — always check a specific competitor's own privacy policy and pricing page, since these details change.)