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Protect a PDF with a password so it can’t be opened without it, or remove a password you already know from a protected file. Standard 128-bit encryption, opens in every PDF reader.
Last updated 5 September 2026
Drag & drop a file here, or
One PDF, up to 50 MB
Pick whether you want to protect a PDF or unlock one you already have the password for.
Set a new password to protect the file, or enter the current one to remove it.
Your protected or unlocked PDF is ready immediately.
The PDF is re-saved with standard 128-bit encryption tied to your chosen password. Any PDF reader will now prompt for it before opening the file.
This is not a password-recovery or password-cracking tool. Removing a password requires knowing it — the tool checks your password against the file’s own security details and only proceeds if it is correct.
It also does not yet support PDFs protected with the newer AES-256 (PDF 2.0) encryption used by some recent Adobe Acrobat exports; those need a desktop PDF reader to remove the password.
A PDF open-password is only as strong as the password itself — a short or common word defeats the purpose of encrypting the file at all. Aim for at least 10–12 characters mixing letters, numbers and a symbol, and avoid anything guessable from your name, birthday or the document's own subject.
Write the password down somewhere safe before you protect the file: this tool has no password-recovery feature by design, and neither does the encryption standard it uses — if the password is lost, the document is permanently inaccessible.
No, and it never will — that would make it a password-cracking tool, not a convenience one. You must know the current password to remove it.
Any of them — Adobe Acrobat, Preview, browser PDF viewers, mobile apps. The 128-bit encryption used is the universal standard.
That newer PDF 2.0 encryption type isn’t supported yet. You’ll see a clear message if this happens; a desktop PDF reader with your password will still be able to remove it.
No. Both protecting and unlocking happen entirely in your browser — your password and file never leave your device.
Yes — unlock it with the current password first, then run it back through Add with the new password you want.
This tool sets an open password only — the file cannot be viewed at all without it. It does not set the separate "permissions" restrictions some PDFs use to limit copying or printing once already open.
Not at the same time — a PDF has one open password. To share different copies with different recipients, protect separate copies of the file with a different password each.