Add strong password encryption to protect your PDF files.
How to Use Protect PDF
Upload the PDF you want to protect.
Enter the password you want required to open the file.
Click "Protect" and download the encrypted PDF - anyone opening it will be prompted for that password.
Key Features & Practical Use Cases
Encrypting sensitive tax documents and financial statements before sending them via email.
Adding secure password gates to proprietary ebooks or research reports before selling them.
Protecting legal contracts or non-disclosure agreements from unauthorized opening.
Frequently Asked Questions
What encryption does this use?
Standard PDF password encryption, which is recognized by all major PDF readers (Adobe Acrobat, browser PDF viewers, etc.) and will prompt for the password on open.
What happens if I forget the password I set?
There's no recovery - since the file is genuinely encrypted, losing the password means losing access, so store it somewhere safe before sharing the file.
Is my password or PDF sent to a server during this process?
No - the encryption is applied entirely client-side in your browser using pdf-lib.
About OneClickly
OneClickly offers 100+ premium online tools for PDF operations, image compression and conversion, text utilities, calculators, and developer tools. All tools run 100% in your browser - no file uploads, no data collection, maximum privacy guaranteed.
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