Question 1

What is the difference between an Open Password (User) and Permissions Password (Owner)?

Accepted Answer

The Open Password (User Password) requires users to enter a password to view document contents. The Permissions Password (Owner Password) allows viewing but restricts operations such as high-resolution printing, text/graphics copying, or page editing.

Question 2

What encryption algorithm does PDFBlack use to secure files?

Accepted Answer

PDFBlack implements military-grade AES-256 (Advanced Encryption Standard with 256-bit key length, R=6 per ISO 32000-2 standards). This is the recognized benchmark for government, healthcare, and banking compliance worldwide.

Question 3

Is it safe to type confidential passwords or upload legal documents to PDFBlack?

Accepted Answer

100% safe. PDFBlack operates with client-side architecture in your browser via native Web Crypto API. Neither your PDF file nor your passwords are ever uploaded or transmitted to external servers. Processing occurs purely in local RAM.

Question 4

Which granular permissions can I restrict on the protected PDF?

Accepted Answer

You have granular control to allow or block: printing (standard and high quality), copying text and graphics, document modifications, page insertions/deletions, form field completion, and content extraction.

Question 5

Are protected documents compatible with Adobe Acrobat and mobile readers?

Accepted Answer

Yes, 100% compatible. Protected PDFs strictly adhere to ISO PDF 1.7/2.0 specifications, seamlessly prompting for passwords in Adobe Acrobat, Foxit, Apple Preview, Google Chrome, Edge, and mobile readers.

Question 6

Can I protect multiple PDF files at the same time?

Accepted Answer

Yes. You can queue multiple documents. The engine applies security policies to each file in isolated Web Workers, allowing individual downloads or a combined .ZIP package.

PROTEGER PDF CON CONTRASEÑA — CIFRADO AES-256

Complete Protection for Confidential Documents

Military AES-256 Encryption

Granular Permissions

Zero-Server Total Privacy

Frequently Asked Questions

Targeted Solutions & Official Workflows

Password Protect PDF Without Uploading to Cloud

Targeted Solutions & Official Workflows

Password Protect PDF Without Uploading to Cloud