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Add a password to a PDF before emailing contracts, payslips, medical documents or anything else that shouldn't be readable by whoever ends up with the file. The output is encrypted with AES-256 — the current standard — and requires the password to open in any PDF reader.
Send the password through a different channel than the file (text it if you emailed the PDF). And store it safely: there is no recovery, which is rather the point.
Frequently asked questions
How strong is the protection?
AES-256 encryption — the same standard used for banking and government documents. With a decent password, brute-forcing it is not realistic. With "1234", encryption can't save you: the password is the weak link.
Will the recipient need special software to open it?
No — every mainstream PDF reader (Adobe, Preview, browsers, phones) prompts for the password and opens the file normally once entered.
What's the right way to share the password?
Any channel other than the one carrying the file. Email the PDF, text or call with the password — if one channel is compromised, the document stays sealed.