How to Password-Protect a PDF (and Remove a Password You Know)

Q: How do I remove a password from a PDF I have the password to?

Use [unlock PDF](/pdf-unlock), enter the password you already know, and download the unlocked copy. It only works on PDFs you can already open.

2026-06-12

Short answer: To put a password on a PDF without handing your sensitive file to a stranger's server, use ToolKoala's PDF protect — you open the file, type a password, and it encrypts everything locally in your browser. Nothing uploads. That last part matters more than people think: if you're protecting a contract, a tax return, or a passport scan, uploading it to a random "free PDF password" site to add security is the most backwards thing you can do.

How to add a password in the browser

Open PDF protect and drop in your PDF.
Type the password you want. Pick something you'll actually remember — there's no reset.
Click protect. The tool encrypts the file in place and hands you back a downloaded, locked copy.
Test it: open the downloaded file in any PDF reader. It should prompt for the password.

Because it runs entirely client-side, you can prove the file never leaves: open DevTools (F12) → Network tab before you start, and watch — no upload request fires. Your original is untouched on disk; you get a new encrypted copy.

Owner password vs user password (they're different)

PDF has two kinds of passwords, and confusing them trips people up:

User password (open password): required to open and read the document at all. This is the one most people want.
Owner password (permissions password): the file opens freely, but printing, copying, or editing is restricted. Honestly, owner-password restrictions are weak — plenty of viewers ignore them — so don't rely on them for anything serious. For real protection, set a user password.

Removing a password is NOT cracking

This is the honest part. You can remove a password from a PDF only if you can already open it — i.e., you know the password. That's legitimate: maybe a bank sends statements locked with your ID number and you're tired of typing it. For that, use unlock PDF — you supply the password you already have, and it writes out an unlocked copy.

What no honest tool does is bypass a password you don't have. ToolKoala won't crack a PDF you weren't given access to, and you should be deeply suspicious of any site that claims it can — that's either a scam or it's brute-forcing on a server you've now handed your file to.

Alternatives, honestly

macOS Preview (free): File → Export → "Encrypt" checkbox, set a password. Genuinely good if you're on a Mac. No upload, no install.
Adobe Acrobat (~$20/mo): Full-featured, sets both password types, but it's a subscription and the cloud features upload your file.
Upload-based online tools (free-ish): Convenient, but for confidential documents this defeats the entire purpose. Don't.

FAQ

Can I password-protect a PDF for free? Yes. ToolKoala's tool is free and runs in-browser, and macOS Preview does it free too. You don't need Acrobat for a basic open-password.

How do I remove a password from a PDF I have the password to? Use unlock PDF, enter the password you already know, and download the unlocked copy. It only works on PDFs you can already open.

Can I recover a PDF password I forgot? No honest tool can. Strong PDF encryption isn't reversible without the password — that's the point. If you set it, you own remembering it.

Is uploading my PDF to add a password safe? For anything sensitive, no. The whole reason you're encrypting it is privacy, so use an in-browser tool where the file never leaves your machine.

— Milo 🐨