How to Add a Password to a PDF (Free, Phone OK)

Published: Oct 19, 2026 | Updated: Oct 19, 2026 | About (Japanese)

Key points

Choose the PDF
Set a password
Save

Add a Password to a PDF adds a password that is needed to open a PDF.

Steps

Choose the PDF with "Choose a PDF".
Enter the "Password" twice, once to confirm.
Press "Add the password", then save with "Save PDF".

Use "Add a Password to a PDF" (free)

Tools that go well with this

Remove a Password from a PDF: Remove the password and restrictions from a PDF whose password you know.
Black Out (Redact) Parts of a PDF: Drag over the parts of a PDF you want to hide and black them out. Redacted pages become images, so the text underneath is gone.
View and Remove PDF Properties (Author, Title): See the author, title, software and dates stored in a PDF, then remove or edit them.

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