BASALT · JOURNAL
When a PDF password will not work
PDFs have two separate passwords and confusing them accounts for most of these problems.
User password versus owner password
The user password is required to open the document. Without it the content is encrypted and unreadable.
The owner password permits changes to permissions such as printing, copying and editing. The document opens without it.
A file can have either, both, or neither. Being asked for a password on opening means a user password. Being refused permission to edit a document that opened fine means an owner password.
Why a correct password can fail
Keyboard layout, particularly for passwords containing symbols typed on a different layout than the one that set it.
Copy and paste picking up a trailing space, which is invisible and common when the password came from an email.
Encryption the application does not support. Very old documents use RC4 and very new ones AES-256; a tool supporting only one range will fail on the other with a message that looks like a wrong password.
Removing a password you have
Legitimate removal requires the password. With it:
qpdf --decrypt --password=YOURPASSWORD locked.pdf unlocked.pdfThat produces an unencrypted copy. Keep the original, because you are creating a document with a protection deliberately removed and should be able to show which is which.
Passwords you do not have
No legitimate tool will open a document whose user password you do not know, and any product claiming to is either misrepresenting what it does or attacking the encryption.
If it is your own document and the password is lost, the honest answer is usually to obtain another copy from whoever produced it.
What password protection does not do
It does not remove anything from the file. Metadata, attachments and hidden content remain, and they are readable to anyone with the password. Encryption controls access, not content, and the two are frequently confused when someone is trying to make a document safe to send.
Frequently asked questions
Why is my PDF password not working?
Check for a trailing space from copy and paste, a keyboard layout difference if the password contains symbols, or an encryption method your application does not support, which produces a message that looks identical to a wrong password.
What is the difference between a user and owner password?
The user password is required to open the document. The owner password controls permissions such as printing and copying, and the document opens without it. A file can have either or both.
How do I remove a password from a PDF?
With the password: qpdf --decrypt --password=YOURPASSWORD locked.pdf unlocked.pdf. Keep the original, since you are producing a copy with a protection deliberately removed.
Can I open a PDF whose password I lost?
Not through legitimate means. Any tool claiming otherwise is either misdescribing itself or attacking the encryption. Obtaining a fresh copy from whoever produced it is usually the practical answer.
Doing it in Basalt
Basalt is a native macOS PDF toolkit: eighteen tools in one window covering merge, split, page organisation, compression, OCR, passwords, Bates numbering, forms, signing, watermarks and comparison. Every file is processed on your Mac, and the engine that opens documents holds no network entitlement at all, which macOS enforces at the code-signature level. Redaction destroys content rather than covering it, and an independent verifier proves the material is gone before a file is written. A one time $29 licence covers up to three Macs, free for the first 24 hours. Get it at basaltformac.com, or brew install --cask chipmunk1101/tap/basalt.
Redaction that proves itself
Basalt destroys the content you mark, then re-opens the file it wrote and proves the content is gone before it saves anything. Your documents never leave your Mac.