The problem with most "remove PDF password" tools
Search for "remove password from PDF online" and the pattern repeats: upload the file, type the password into a box right next to it, wait, download the result. Unlocking a password-protected document means handing over both the file and the exact thing that was protecting it - to a server you have no visibility into and no reason to trust with either.
Decrypting a PDF you already have the password for isn't actually server-side work. It's a matter of reading the file's encryption dictionary and writing it back out without one - something a PDF engine can do entirely inside a browser tab.
Removing a password in your browser instead
Remove PDF Password does exactly that, using mupdf compiled to WebAssembly: drop in the file, enter the password once, and it decrypts and downloads a fresh copy locally. Open the network tab while using it and you won't see the file or the password go anywhere - there's no upload step to watch for, because there isn't one.
A few things worth knowing before you use it:
- You need to already know the password. This removes protection from a PDF you have legitimate access to - it can't guess, brute-force, or crack a password you don't know. If you're locked out of your own file, this isn't that tool.
- It handles standard PDF encryption, not every edge case. Most password-protected PDFs use the same standard encryption scheme and unlock cleanly. A corrupted file or an unusual protection scheme shows an error instead of a broken download - better than failing silently.
- The unlocked copy is a plain, unencrypted PDF. No watermark, no trial limit, no re-locking itself later - once it's decrypted, it stays that way, so keep the file somewhere reasonable if the contents were sensitive enough to password-protect in the first place.
The pattern to look for
This is the same story as merging PDFs or blurring a face in a photo: a lot of "free online tools" default to a server round-trip for tasks that don't need one. If you're merging files together afterward, PDF Merger works the same client-side way - unlock, then merge, without either step leaving your device.