PDF Password Protect & Remove
PDF Password Protect & Remove
Add a password to restrict who can open a PDF, or remove an existing password from a PDF you already know the password for. All encryption and decryption happens locally in your browser.
- Add Password: Encrypt any PDF with a password of your choice
- Remove Password: Unlock a PDF once you provide its current password
- Private: Your PDF and password are never uploaded
Why encrypt or unlock a PDF in your browser?
Setting or removing a PDF password normally means uploading the document (and typing its password) into a web form you have to trust. Karvics performs real PDF encryption and decryption using a WebAssembly-backed library entirely inside your browser tab — your file and password never leave your device, which matters most for the exact kind of documents people password-protect: contracts, tax records, and confidential reports.
How the encryption works
How the encryption works
- Real encryption: Uses standard PDF encryption, not a superficial lock screen
- Two-way: Both adding and removing a password are supported
- Local processing: Encryption/decryption runs in-browser via WebAssembly, no server round-trip
- Error handling: Wrong passwords are rejected with a clear retry prompt instead of silently failing
How to Use
- Choose "Add Password" or "Remove Password"
- Upload your PDF file
- Enter the password to set (or the current password to remove it)
- Download the resulting PDF
💡 Pro Tips
- Use a password you can remember or store in a password manager — if you lose it, this tool (or any tool) cannot recover or bypass it.
- If "Remove Password" reports the file isn't protected, double-check you uploaded the encrypted copy and not an already-unlocked version.
Glossary
- PDF Encryption
- A standard that restricts opening or editing a PDF unless the correct password is supplied.
- User Password
- The password required to open and view a PDF document.
- Owner Password
- A password that controls permissions like printing, copying, or editing, separate from the password needed just to view the file.
- Brute-force Attack
- Repeatedly guessing passwords until one works — a strong, unique password meaningfully increases the time this would take.