Lock PDF to Prevent Printing 2026 — Free Online

Lock a PDF so it cannot be printed. The restriction is written into the file's permission bits and honoured by the readers that respect them — which is most, but not all, and this page is straight about the difference.

How a print restriction is stored

PDF permissions are a single integer in the encryption dictionary, and the bits are fixed by the specification. Bit 3 governs printing and bit 12 governs high-resolution printing. Clearing bit 3 is what greys out the Print command; clearing bit 12 alone leaves printing possible but only at a degraded resolution, which is how some publishers allow a rough proof and not a usable copy.

That integer only means anything to a reader that reads it. Acrobat, Preview, and the viewers in Chrome, Edge and Firefox all honour it. Command-line tools and a number of PDF libraries do not, and they are not doing anything clever when they ignore it — the bits are a request, and nothing in the file enforces them.

So this is the right tool for stopping a colleague printing a draft, and the wrong one for stopping a determined person with software. Anyone telling you otherwise about any PDF tool is describing the format inaccurately.

  • Bit 3 — printing; clearing it greys out Print
  • Bit 12 — high-resolution printing, separately controllable
  • Honoured by readers, not enforced by the file

Why this tool also asks for an open password

Permissions are bound to the encryption, so a PDF cannot carry them without being encrypted. This tool sets an open password as part of that, which means the file both requires a password to open and forbids printing once open. If you wanted a file anyone can read but nobody can print, this will do more than you asked.

The permissions themselves are set from the three toggles above the button. Leaving printing on "Allow" and only blocking editing is a common combination for documents that are meant to be read and filed but not altered.

One detail that matters: permissions only restrain someone holding the open password, and if the owner password is the same string, the recipient you gave it to can lift every restriction by typing it again. The file made here uses a separate random owner password whenever anything is restricted, so that route is closed.

What a print lock does not cover

Screenshots. Nothing in the PDF format can prevent a screen capture, and a page captured at screen resolution prints perfectly well for most purposes. The same goes for a phone camera pointed at the screen.

Nor does it stop the content being read, quoted or retyped. A print restriction is a control on convenience — it stops the accidental and the casual, which is usually what it is for.

Frequently Asked Questions

Can the person still screenshot the pages?

Yes, and no PDF setting can prevent that. A print restriction stops the Print command, not the screen. Treat it as a control on convenience rather than a guarantee.

Will every PDF reader respect it?

Most will — Acrobat, Preview, and the built-in viewers in Chrome, Edge and Firefox all honour the permission bits. Some command-line tools and libraries ignore them, because the bits are a request the format does not enforce.

Can I block printing without also setting an open password?

Not with this tool as it stands. Permissions are carried by the encryption, and this sets an open password as part of it, so the file will ask for one before it can be read at all.

Can the recipient just remove the restriction?

Not by re-entering the password you gave them. When anything is restricted, the file is written with a separate random owner password that nobody holds, so the usual "enter the owner password" route in a reader does not open.

Does blocking printing change how the PDF looks?

No. Nothing about the pages, fonts or layout is touched — only the permission bits in the encryption dictionary.

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