PDF Security Checker

How to use the pdf security checker

1. Choose a PDF.
2. Read whether it is encrypted and which actions it restricts.
3. Note that flags are requests to the reader, not enforcement.

About this tool

PDF security comes in two quite different forms, and they are routinely confused by the people relying on them.

An open password encrypts the document. Without it nothing can be read — not by this tool, not by any other. That is real protection, and a file carrying one is reported here as unreadable rather than pretended otherwise.

An owner password sets permission flags: no printing, no copying, no editing. These do not encrypt anything. The content is fully readable, and the flags are a request that a reader may honour or ignore — many ignore them entirely. It is a sign on a door rather than a lock, which matters because organisations do rely on it to protect documents it cannot protect.

So this reports both: whether the document is encrypted, which actions it asks readers to withhold, and what that request is worth. A document with no restrictions at all reports that plainly too, because "no permissions returned" means unrestricted rather than forbidden, and reading it the other way round is an easy and consequential mistake.

The accessibility flag is the one worth looking at twice. A document that restricts copying for accessibility is asking readers to withhold its text from screen readers, which in many jurisdictions is a compliance problem as well as an unkind one.

Common uses

• Checking why a PDF refuses to let you copy text.
• Auditing whether a document blocks screen readers.
• Finding out whether a file is genuinely encrypted or merely flagged.

Frequently asked questions

What is the difference between an open and an owner password?

An open password encrypts the file: without it nothing is readable. An owner password only sets permission flags, which readers may honour or ignore — the content is not protected.

Can permission flags stop someone copying my text?

No. They ask the reader not to allow it, and plenty of readers ignore them. If a document must not be copied by someone who has it, the file cannot enforce that.

What does no permissions returned mean?

That the document sets no restrictions at all, so everything is permitted. It does not mean everything is forbidden, which is the easy misreading.