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Protect PDF
Encrypt your PDF with a strong password to prevent unauthorized viewing.
or drag & drop your files directly here
Files are processed locally in your browser and never uploaded to any server.
How to use Protect PDF
Follow these simple steps to process your files in seconds.
Upload your PDF
Select the PDF document you want to secure with a password.
Set your password
Enter a strong password. You can toggle visibility to double-check your spelling.
Encrypt and download
Click "Protect PDF" to apply 128-bit encryption instantly in your browser.
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Frequently Asked Questions
Is my password sent to any remote server?
No, never. The 128-bit encryption is executed entirely inside your browser using client-side JavaScript. Your password and files remain 100% private.
Which PDF viewers can open protected files?
Protected PDFs adhere to the official ISO 32000-1 PDF standard and can be opened with Adobe Acrobat Reader, Google Chrome, Apple Preview, Microsoft Edge, and mobile PDF readers.
What happens if I forget my password?
Because encryption runs entirely locally and we do not store your keys, there is no backdoor. Make sure you remember or safely store your password.