Protect PDF
Encrypt any PDF with a password — processed entirely on your device. No upload, no limits.
Drop your PDF here or click to select
Use a strong password; if you forget it, the file cannot be recovered. The original PDF is never uploaded.
How to Use Protect PDF
- Drag your PDF file onto the drop zone or click to select it from your device. The original file size is displayed.
- Enter a strong password (minimum 4 characters) and confirm it. Use the eye icon to toggle visibility and check your input.
- Click Protect PDF. The tool encrypts the document using AES‑128 directly in your browser — no upload.
- Once the progress finishes, download the protected PDF. When opened, any reader will immediately ask for the password.
Benefits of Protect PDF
- True local encryption — the PDF is never sent to a server, making it safe for salary slips, contracts, and ID proofs.
- AES‑128 encryption is universally supported by Adobe Reader, Preview (Mac), Foxit, and mobile PDF viewers.
- Password visibility toggle prevents typos; a confirmation field ensures you didn’t accidentally mistype your secret.
- No file size limits, no watermarks, and no account needed — protect as many PDFs as you want in quick succession.
Frequently Asked Questions
What happens if I forget the password to my protected PDF?
There is no recovery option — the encryption is designed to be irreversible without the password. Always store the original unprotected file in a safe, offline location as backup.
Can I set separate passwords for opening and editing?
This version uses a single user password that both unlocks and restricts printing/copying. For advanced owner‑level permissions, a desktop PDF editor is required.
Will the protected PDF work on a smartphone?
Yes, the encryption complies with the PDF 2.0 standard and works on all modern mobile PDF readers that support password‑protected files.
Is Protect PDF free and private?
Yes — it is 100% free, needs no sign-up, and everything runs in your browser; your data never leaves your device.