PDFMaxProtect PDF with a Password
Need to keep a PDF private? Use this free Protect PDF tool to add a password and encrypt your document so only people with the password can open it. It runs right in your browser — no account, no email, and no software to install. Just pick your file, set a password, and download the protected PDF in seconds. It works the same on a phone, tablet, or computer, and it handles everyday documents like contracts, invoices, bank statements, and reports. Your file's content stays exactly as it was — encryption only locks access, it doesn't change the pages.
Protect PDF →100% freeNo signupWorks in your browser
Why PDFMax
- 100% free with no signup, no email, and nothing to install — open the page and go
- Adds a real open password and encrypts the file, so it can't be opened without the password
- Works on any device — phone, tablet, or desktop, in any modern browser
- Keeps your document intact: encryption locks access without changing the pages or quality
How to protect pdf
- Upload your PDFClick to select the PDF you want to lock, or drag and drop it onto the page.
- Set a passwordType the password that will be required to open the file. Use a strong one — at least 8 characters with letters, numbers, and a symbol — and write it down somewhere safe.
- Protect the PDFPress Protect to encrypt the file and apply your password.
- Download the protected fileSave the encrypted PDF. From now on it will ask for your password every time someone tries to open it.
Frequently asked questions
Is it free to password protect a PDF here?
Yes. The tool is completely free, with no signup, no email, and no watermark. You can protect as many PDFs as you need.
What happens if I forget the password?
There is no recovery. A password-protected PDF can only be opened with the correct password, and we never store or see it — so keep your password somewhere safe. If you lose it, you'll need the original unprotected file.
How strong is the protection?
The tool encrypts the PDF and sets an open password, so the file can't be read without it. For the best security, use a long, unique password — short or common ones are much easier to guess.
Does it work on my phone?
Yes. It runs in the browser on Android and iPhone as well as Windows and Mac. There's nothing to install — just open the page and add your password.
Will protecting the PDF change its content or quality?
No. Encryption only controls who can open the file. The pages, text, images, and layout stay exactly the same.
Can I remove the password later?
Yes, as long as you know the password you can unlock the PDF again. Keep the protected file and the password together so you don't get locked out.