Sometimes, when printing, modifying and converting a PDF file, it is always impossible to perform the corresponding operation, indicating that the document is encrypted, but it can be opened normally. What's the matter?

This kind of encryption is generally partial authority encryption of PDF files, which is easy to be cracked. Here are two simple operation methods.

Method 1: Free online decryption.

With the help of the website: Speedpdf

Operation method:

1. Search After opening the Speedpdf free online conversion webpage, go to its home page and select pdf for decryption;

2. Click Select File to add an encrypted PDF document, and then click the Convert button after the progress bar to start decryption. When finished, the conversion button will change to download. Click Download directly.

Method 2: Client batch operation

With tools: play at the highest speed

1. After downloading and installing this tool, select PDF decryption in the PDF tool to enter the next operation;

2. Drag all PDF documents directly to the conversion page, modify the document storage location in the lower left corner of the page, click on the lower right corner to start decryption, and decrypt with one button;

3. You can view all decryption records during the conversion process, and right-click the document to open the corresponding file.