Crack .pdf password


SoSH Member
Feb 4, 2006
I have a document that's several years old (maybe 4 or 5) and has a password on it to prevent it from being opened. Any bright ideas on how to crack it?


Well-Known Member
Silver Supporter
SoSH Member
Oct 2, 2004

It appears that much older PDF files, v1.3 and down are sort of trivial to hack. 2.0 and up use "real" cryptography, and I think 4-5 years ago you'd likely have a v2.0 PDF (you can look at "document properties" on a mac, and probably something similar on a PC to find the version: )

There may be some free/demoware things mentioned in that quora that can create a non-password-protected PDF from a protected one, but I suspect they depend on it being the older version. If they are free you might give them a shot.

If it's a new PDF and a strong, unknown password you are pretty screwed, I'm sad to say.