SaM
3
Read the above tutorial, you can do that with or without third-party tools. everything mentioned in the above article.
For online removals try any of these:
https://smallpdf.com/unlock-pdf
https://www.ilovepdf.com/unlock_pdf
https://www.sodapdf.com/unlock-pdf/
https://online2pdf.com/remove-pdf-password
https://www.pdf2go.com/unlock-pdf
https://www.unlock-pdf.com/
If you use Kali Linux then you can also use this:
Good luck!
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