Use a strong password
Length and unpredictability matter. A password manager can create and store a strong value.
PDF Tools · Local processing
Protect PDF
Add real AES-256 password encryption to a PDF in your browser using a verified PDF encryption engine.
AES processing on your device
Protect a PDF with a password
The practical guide
Password protection is genuine encryption, not a cosmetic flag.
The browser applies standard PDF AES-256 encryption. The same password is configured for opening and owner access so it can be removed later.
Keep the password safe
StayInBrowser never receives or stores it and cannot recover a forgotten password.
Privacy by architecture
Your files and tool inputs stay in your browser.
The selected files, inputs, settings, and outputs are processed in this page and are not uploaded to any server.
Questions, answered
Frequently asked questions
Is the password sent anywhere?
No. It is used in browser memory by the PDF encryption engine.
Is the output really encrypted?
Yes. The output uses the standard PDF AES-256 security handler recognized by compatible PDF readers.
Can StayInBrowser recover my password?
No. Save it securely before downloading the protected document.