Bank statements, payslips, contracts, medical letters and scanned IDs all end up as PDFs — and all of them are things you don't want opened by the wrong person if an email is forwarded or a laptop is lost. Adding a password encrypts the file so it can only be opened by someone who knows it. You can password protect a PDF for free without uploading the document anywhere — the encryption happens in your browser.
Why password protect a PDF
- Control who can open it — a forwarded email or shared drive no longer exposes the contents to everyone with the link.
- Protect sensitive documents — statements, tax forms, contracts and IDs stay unreadable without the password.
- Meet requirements — many organisations require financial or HR documents to be encrypted before they're emailed.
Step-by-step
- Open the Protect PDF tool.
- Drop in the PDF you want to secure.
- Type the password you want people to need in order to open it.
- Click Protect PDF — the file is encrypted right there in your browser.
- Download the protected copy and share it safely.
Anyone who opens the file afterwards — in any PDF reader — will be asked for the password before a single page is shown.
Choosing a strong password
- Use at least 12 characters mixing upper and lower case, numbers and a symbol.
- Avoid names, birthdays or the document's own subject — those are the first things guessed.
- Send the password separately from the file — a different channel (a text or a call), never in the same email.
- Store it in a password manager so you don't lock yourself out.
Why encrypting in the browser is safer
With most online tools, “protecting” a PDF means uploading an unprotected copy to a stranger's server first — the exact document you're trying to keep private travels over the internet and sits in their storage. Here the encryption runs locally, so the unprotected file never leaves your device. The only copy that goes anywhere is the one already locked with your password.
FAQ
Is it free? Yes — no signup, no watermark, and no limit on how many PDFs you protect.
Is my file uploaded? No. The PDF is encrypted in your browser and never sent to a server.
Can I remove the password later? Yes — if you know the password you can remove it again with the Unlock PDF tool.
What if I forget the password? There is no back door — a forgotten password can't be recovered, so store it somewhere safe.