Protect PDF
Add password protection to PDF files with 128-bit encryption.
Click to upload PDF
PDF up to 20MB
About our Protect PDF
Secure your PDF documents for free with password encryption. Your files never leave your device — protection happens entirely in your browser.
All Done is a leading platform offering free online utility tools and browser-based productivity applications, requiring no software installation or registration. Every web utility is fully optimized for speed, delivering secure, client-side data processing and instant results directly inside your browser tab.
Frequently Asked Questions
How can I password protect a PDF for free?
Upload your PDF above, enter a password, and download the protected file. It is completely free with no sign-up, and your file never leaves your device.
Can I password protect a PDF without Adobe Acrobat?
Yes. This tool encrypts your PDF with standard 128-bit protection that opens in Adobe Reader, Chrome, Preview, and all major PDF viewers — no Adobe software needed.
What happens if I forget my PDF password?
A forgotten password cannot be recovered. The encryption is designed so that without the correct password, the document cannot be opened by anyone — including us. Save your password somewhere safe before downloading.
Is it safe to protect confidential PDFs with an online tool?
Yes — with this tool, there is nothing to upload. Encryption happens 100% in your browser using your device's processor. Your document never touches our servers.
How strong is the protection?
The tool uses 128-bit RC4 encryption, the standard PDF password protection supported by all major readers. It stops casual unauthorized access. For highly sensitive documents, consider AES-256 desktop software for stronger protection.