Secure your PDF documents by adding password protection. Only people with the password can open the file.
Free outputs carry a small "Processed by Konomic" footer. Upgrade to remove
Drag & drop files here, or click to browse
PDF · up to 50 MB (free)
Upload your PDF
Enter a password
Click 'Protect PDF'
Download the encrypted file
No hidden fees, no credit card required. Basic tools are free forever.
Files are encrypted in transit and deleted automatically after 1 hour.
Most operations complete in under 10 seconds. Powered by optimized servers.
Works directly in your browser. No software to download or install.
Works on Windows, Mac, Linux, iPhone, Android, and Chromebook.
We never share, sell, or access your files. Full privacy guaranteed.
We use AES-256 encryption, the same standard used by banks and governments.
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