Protect your PDF documents by adding password encryption to prevent unauthorized access and keep sensitive information secure.
Protect your PDF documents by adding password encryption to prevent unauthorized access and keep sensitive information secure.
PDF · single file · any sizeThree steps. No software. No account.
A Protect PDF tool helps secure documents by adding password protection and restricting unauthorized access. When sensitive information is stored in a PDF file, protecting it ensures that only authorized users can open or modify the document.
This feature is particularly useful for documents such as financial records, contracts, reports, and confidential files that require controlled access.
By applying security settings, users can prevent editing, copying, or printing of the document. Protecting PDFs adds an extra layer of digital security that helps safeguard important information from misuse or unauthorized sharing.
Both options produce strongly encrypted PDFs that cannot be opened without the password. The choice depends on your compatibility requirements and security level needed.
| Feature | 128-bit AES | 256-bit AES |
|---|---|---|
| PDF Standard | PDF 1.4 – 1.6 | PDF 2.0 (Acrobat X+) |
| Compatible Readers | All readers, including very old ones (Acrobat 5+) | Acrobat X, Foxit, modern readers |
| Key Length | 128 bits | 256 bits |
| Security Level | High — sufficient for most business use | Maximum — recommended for sensitive documents |
| Brute-Force Resistance | Strong with a good password | Extremely strong — practically unbreakable |
| Recommended for | General documents, broad sharing, legacy systems | Confidential contracts, legal, financial, medical |
Protect sensitive documents by adding password security and preventing unauthorized access to your PDF files.
No account · No upload · No data stored · Works offline