Add password protection to a PDF. The output genuinely requires the password to open — encryption happens entirely in your browser.
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Protect PDF adds a password to an existing PDF file, so it can only be opened by someone who knows the password — useful for sending sensitive documents like salary slips, contracts or ID copies over email where you don't want the content readable if it reaches the wrong inbox.
This adds an 'open password' (user password) that Adobe Acrobat and most PDF readers respect, encrypting the document's contents; keep in mind that PDF password protection, while a useful basic safeguard, isn't unbreakable against determined attackers with specialized recovery tools, so treat it as a deterrent for casual access rather than military-grade security.
There is no way to recover a lost password from a protected PDF through this tool — store the password somewhere safe, since a forgotten password means the document becomes permanently inaccessible without third-party password-recovery software.
It's a reasonable basic safeguard against casual unauthorized access (like an email being read by the wrong person), but determined attackers with dedicated cracking tools can sometimes break weaker passwords — use a long, unique password and consider additional safeguards for extremely sensitive files.
Most AIVEXA tools run entirely in your browser (client-side), which means your files and inputs are processed on your own device and are not uploaded to a server.
Yes — it works on any modern browser (desktop, Android or iOS) without installing an app, and it's free to use with no signup or watermark.
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