You may have ever encountered such situations that being rejected by password-protected PDF files which are of importance. This app is a useful tool for finding recovering passwords and content from PDFs.
This app uses the pattern you enter to find a PDF password.
If you remember part of the password, alphabet, or number pattern, you can find the password with this app. If you expand the pattern to reduce the number of cases, you can find the password you just forgot.

This app only works locally without going through the server. It allows you to find a password for PDF file in your browser directly.
You can also use this app to check the strength of your PDF password.