https://www.workintool.com/pdf-converter-tips/how-to-password-protect-a-pdf.html
How to password protect a PDF free on Windows/Mac/online? This post offers 5 PDF encryption tools to add password to PDF easily.
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https://www.hipdf.com/protect-pdf
This online free PDF tool allows you to encrypt and protect a PDF file online by adding a password. No registration or installation required.
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https://tiiny.host/blog/how-password-protect-pdf-without-adobe/
Don’t have Acrobat Pro? Visit Tiiny.host to password-protect and securely share your PDF file without using Adobe Acrobat Pro.
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https://www.ilovepdf.com/protect-pdf
Encrypt and protect PDF with a password to safeguard sensitive information. Secure your PDF files online, with ease and without registration.
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https://smallpdf.com/protect-pdf
Password protect your PDF to prevent unwanted access. Keep your files safe and sensitive info secure with a free online PDF lock with trusted encryption.
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