Protect PDF
Lock a PDF with a password before you send it. The protector encrypts the entire document with AES-256 — the same standard used for sensitive documents — so the file cannot be opened without the password. Crucially, the password is typed into your browser and never transmitted anywhere: the encryption happens locally, and only the encrypted file leaves via your download folder. Add a password, click Protect PDF, and share the result through email or cloud storage with confidence. It takes seconds and costs nothing.
Guide: How to Password Protect a PDF — step-by-step walkthroughHow to use Protect PDF
Add your PDF
Click the file picker and select the document you want to encrypt.
Set a password
Type a strong password — it is used only on your device and never uploaded.
Protect and download
Click Protect PDF and save the encrypted file, ready to share safely.
Tips for best results
- Use a passphrase of 12+ characters — length beats complexity for resistance to guessing.
- Share the password through a different channel than the file itself.
- Keep a copy of the unprotected original somewhere safe; a forgotten password cannot be recovered.
Frequently asked questions
Is my password uploaded to a server?
No. The password is typed into your browser and used locally for encryption. Only the already-encrypted PDF is downloaded — no password or document content is ever sent anywhere.
What encryption standard is used?
Documents are encrypted with AES-256, the industry standard for protecting sensitive files. The resulting PDF opens in any standard viewer once the correct password is entered.