Decrypt PDF

"Decrypt PDF" tools are software applications that are designed to remove password protection or restrictions from encrypted PDF (Portable Document Format) files. PDF documents can be protected by passwords, which restrict access to certain features, such as printing, copying, editing, and extracting text and images. Decrypt PDF tools allow users to remove these restrictions or passwords and gain full access to the PDF document.

These tools typically work by using various decryption techniques, including brute force attacks, dictionary attacks, and rainbow table attacks. Brute force attacks involve trying all possible combinations of characters until the correct password is found. Dictionary attacks use a predefined list of words and phrases commonly used as passwords to try and find the correct password. Rainbow table attacks use precomputed tables of hashes to speed up the password cracking process.

Some Decrypt PDF tools may also offer other features, such as the ability to merge or split PDF files, add watermarks, or compress PDF documents. However, it's important to note that using Decrypt PDF tools to remove password protection from a PDF file that you do not have permission to access may be illegal and unethical.