Can this remove a password I do not know?

No. Unlocking requires the correct password — this removes protection from documents you can already open, it does not break encryption.

How much smaller will compression make my file?

It depends entirely on the content. Scans and image-heavy documents often shrink dramatically; a PDF that is mostly text may barely change, because text is already compact.

🔐 PDF Tools

Password-lock or unlock a PDF, or compress it to a smaller file.

PDF file

Password to set

Encrypts the PDF so it needs the password to open.

About PDF Tools — Password & Compression

Three PDF operations that are awkward without the right software: adding a password, removing one you know, and reducing a file that is too large to email.

How to use it

Choose lock, unlock or compress.
For locking, set the password to encrypt the document with. For unlocking, supply the current password.
For compression, pick a level and compare the resulting size against the original.

Frequently asked questions

Can this remove a password I do not know?: No. Unlocking requires the correct password — this removes protection from documents you can already open, it does not break encryption.
How much smaller will compression make my file?: It depends entirely on the content. Scans and image-heavy documents often shrink dramatically; a PDF that is mostly text may barely change, because text is already compact.