---
title: Free PDF Password Protection Online – AES-256 Encryption | HelpRange
url: https://www.helprange.com/tools/password-protect-pdf
---

Free tool

# Password-protect a PDF

Encrypt a PDF with AES-256 and a password of your choice. Optionally block copying and printing.

[Do this for your team](https://www.helprange.com/feature-secure-documents-sharing)

## How it works

### Choose your PDF

Up to 10 MB; files are deleted within 30 minutes.

### Set a password

At least 6 characters – 10 or more with numbers and symbols is much stronger.

### Choose permissions

Allow or block printing and copying text.

### Download the encrypted PDF

Send the password through another channel than the file.
  ![Password-protect PDF: set the password and allow or block printing and copying](/static/images/ui/tools/password-protect-pdf.jpg)Password-protect PDF: set the password and allow or block printing and copying

### Passwords get forwarded. Links with e-mail verification don't.

With HelpRange only the people you choose can open the document (one-time code to their e-mail), downloads can be blocked, access expires or is revoked – and you see who opened it and which pages they read.

 [Try HelpRange free](https://www.helprange.com/?from=tool-cta#signUpSection) [Compare plans – from $39 per team](https://www.helprange.com/pricing?from=tool-cta) [Share PDFs securely](https://www.helprange.com/feature-secure-documents-sharing)

Password protection keeps a PDF unreadable without the password – useful when a file has to travel as an attachment. Its weak point is the password itself: it is often sent in the next e-mail and forwarded together with the file. For confidential documents, a link that verifies the reader's e-mail and can be revoked is safer.

## When a password is the right tool

Password protection encrypts the whole file, so it is unreadable without the password – on a lost laptop, in a mailbox that is breached, or in a shared folder. That makes it a good fit for files that must travel as attachments: payslips, tax returns, medical letters, contracts sent to one person.

Tips: use a different password per recipient or per document, send it by phone or messenger rather than in the next e-mail, and keep a copy of the unprotected file – a lost password cannot be recovered.

## Its limits

- Anyone with the password can open, save and forward the decrypted content.
- “No printing” and “no copying” permissions are respected by Adobe Reader and most viewers, but some tools ignore them.
- You cannot change the password or take access back after sending.

If you need to know who opened the document or to withdraw access later, send an [expiring link](https://www.helprange.com/tools/expiring-pdf-link) or a link that verifies the reader’s e-mail instead. To make form fields read-only first, [flatten the PDF](https://www.helprange.com/tools/flatten-pdf).

## Example: sending a salary statement

Protect the PDF with a password such as the employee number plus a word you agree in person, untick “Allow copying text”, and send the file by e-mail. Tell the employee the password rule once – not with every message. They can open and print it; anyone who gets the e-mail by mistake sees only an encrypted file.

FAQ

## Password-protect a PDF – questions

How strong is the encryption?

AES-256 – the standard used by Adobe Acrobat. Use a password of 10+ characters.

Do you store my file or password?

No. Both are used in memory to create the encrypted file and are not kept.

How do I send the password?

Never in the same e-mail as the PDF – use a phone call or a messenger. Or share a link that only the recipient's e-mail can open.

Can I remove the password later?

Yes – open the PDF with the password in any PDF editor and save it without encryption, or keep the original unprotected file.

 Related free tools

 [Create an expiring PDF link](https://www.helprange.com/tools/expiring-pdf-link)[Send a self-destructing PDF](https://www.helprange.com/tools/self-destructing-pdf)[Watermark a PDF – one personalised copy per recipient](https://www.helprange.com/tools/pdf-watermark)[Make a PDF uncopyable (rasterize)](https://www.helprange.com/tools/rasterize-pdf)

[All free tools](https://www.helprange.com/tools)