How to delete password from pdf on Windows as it is password protected?

For example, one popular version, pdf-password-remover by ugurkiymetli, can batch-process entire folders and even try a list of common passwords if you don't specify one. Since it's just a Python script, it's exactly the kind of obscure, free method you're looking for to avoid paid third-party software.

To show you exactly how to delete password from PDF using this kind of tool, let's break down the steps you'd generally follow:

1. If you don't have it already, download and install Python 3.7 or newer from the official website.
2. Download the pdf_password_remover.py file from its GitHub page. You can usually do this by clicking the green "Code" button and selecting "Download ZIP".
3. Open your command prompt, navigate to the folder with the script, and run pip install -r requirements.txt to install the required libraries.
4. To process a single PDF file, you'd use a command like python pdf_password_remover.py "C:\path\to\your\folder" and enter the password when prompted. If you know the password, you can use -p "mypassword" right in the command.
5. The script will create a new folder (usually called "unprotected") and save a password-free copy of your PDF there.

It's a pretty straightforward process to learn how to delete password from PDF using this free tool. Just make sure you only use it on files you own or have permission to modify. Since this is a manual process, be sure to check the specific instructions on the GitHub page for the version you download, as the details can vary a bit.