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I have a couple of ebooks as PDFs with passwords, however my ebook reader (sony prs600) doesn't seem to support PDFs with passwords. What is the easiest of removing the password from a PDF (I know the password, which presumably helps a lot). It's a bit annoying buying a book and then only being able to read it in front of a computer.

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4 Answers 4

up vote 4 down vote accepted

With A-PDF Restrictions Remover, you can remove the password and other restrictions in a few seconds.

A-PDF Restrictions Remover is shareware ($10), try before you buy.

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The trial version of this worked perfectly - I think I'll be registering ;-) – Alister Feb 17 '10 at 1:12
@Alister - if you work a lot with protected PDFs, it's well worth it :) – Molly7244 Feb 17 '10 at 12:48

You can try Easy Pdf Password Remover Free. Other alternatives are:

If none of the above worked for you, have a look at this page: 7 easy ways to unlock a PDF file.

NOTE: If you have Adobe Acrobat (not the free Acrobat Reader), you can remove the passwords from File > Document Security > Security Options by selecting No Security.

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The Easy Pdf Password Remover Free only allows for passwords of 3 characters, and you can't specify a password. I couldn't get PDF Password Remover or Unlocker to work - they are both the same tool based on ghostscript or something. – Alister Dec 21 '09 at 23:03
I found that (from the 7 easy ways to unlock a PDF file) works pretty good, however it was sloooooooow. – Alister Feb 24 '10 at 7:58
PDF Unlocker worked like a charm! – Frankie Jul 10 '11 at 23:00

If you have access to a Mac (and, you can try "File", "Print", "Save as PDF" or "File", "Save as" a PDF document.

This has removed the password on some documents for me. I don't know if these tips are applicable to Adobe Reader.

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Don't have a mac, but thanks. – Alister Jan 5 '10 at 1:01
For Linux users I suggest they do this using Okular rather than Evince. Okular maintained text information in the process, while Evince failed to maintain that, or page orientation. – badp May 6 '12 at 18:11
This doesn't work anymore. – Tyilo Aug 15 '12 at 15:10
@Tyilo It does, for any Mac running 10.7 or earlier. It didn't stop working, you just upgraded to a newer software version since this answer was posted. On Mountain Lion, try Preview's File » Save…, File » Duplicate or File » Export…. – Daniel Beck Aug 15 '12 at 15:13
File > Save, exports the file with all pages blank and the other two options, requires me to type the "owner" password although I only know the "user" password. – Tyilo Aug 15 '12 at 15:19

You can use SysTools PDF Unlocker:

  • Microsoft Windows
  • non-gratis if you don't want the SysTools Watermark or need to process batch of PDF files

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It allowed me to remove the security on a password-protected document (for which I knew the password) certified by Adobe EchoSign e-signature service, whereas Adobe Acrobate Pro XI wouldn't let me do it:

enter image description here

You cannot change security on this document because the document is signed or certified.

enter image description here

Trying to print the document also wasn't working:

%%[ ProductName: Distiller ]%%
This PostScript file was created from an encrypted PDF file.
Redistilling encrypted PDF is not permitted.
%%[ Flushing: rest of job (to end-of-file) will be ignored ]%%
%%[ Warning: PostScript error. No PDF file produced. ] %%
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protected by Gnoupi Jul 14 '10 at 7:16

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