Password Protect PDF Files in Just
a Few Clicks
Use Lumr to password protect PDF documents and keep sensitive information accessible only to people with the correct password.
or drop your files here
Max file size 100 MB
- No signup needed
- Private & encrypted
- 256-bit SSL
- AES-256 encrypted
- SOC 2 Type II
How to Password Protect a PDF in 3 Easy Steps With Lumr
Upload the PDF you want to protect
Select the PDF you want to add a password to from your files. Alternatively, just drop it into the upload area.
Create a strong password
Enter the new password, and then confirm it.
Download your protected PDF
Download your new password-protected PDF instantly.
Protect PDFs in a Couple of Clicks
See how simple it is to use Lumr’s PDF password protector tool. You can create a strong password to protect your information in seconds.
Lock it once, encrypted forever.
We apply AES-256 encryption so only people with the password can open, copy, or print your PDF.
AES-256 encrypted · Copy & print restricted · Only you hold the key
Lock PDF Documents With
Strong Password Encryption
With Lumr, it’s simple to add passwords to PDFs without having to install any software. It’s all done in your browser.
Password protection made simple
No experience needed
Our tool is simple to use: upload your file, add a password, and download the protected PDF.
Control who can open your file
Share documents more confidently
Send documents to third parties with the knowledge that only people with the password can open it.
Works in your browser
No installation required
Our PDF password protect online tool works completely in your browser, including Safari, Chrome, Firefox, and Opera.
Protect PDFs on any device
Add passwords on the go
You can protect PDFs using any device, anytime, anywhere. Simply open Lumr on your desktop, phone, or tablet’s browser, and add your password instantly.
Strong password encryption
Protect important information
Lumr uses AES-256 encryption to lock PDFs with password protection. Only someone with the correct password can open and view the protected document.
Secure online processing
Your document is private, always
Lumr protects your files throughout the entire process using strong encryption technology. We do not store your file on our servers once you’ve finished working with it.
Trusted for Simple PDF Protection in Seconds
We help our users protect their private information in just a few clicks.
“We send offer letters and contracts every week. Password protecting them keeps sensitive details private.”
Sarah M.
HR Manager
“Client statements have to stay confidential. lumr lets me lock every PDF in seconds before I send it.”
James K.
Financial Advisor
“Case files are sensitive, so I protect each one with a password. It is fast and I do it right from my browser.”
Ana L.
Legal Assistant
FAQs About Password Protecting PDFs
Learn more about how easy it is to protect your PDFs with Lumr.
Can you password protect a PDF?
Yes, it’s simple to add a password to your PDFs using our online tool. Simply upload your document and enter the password you want to use. You can then download the document, and anyone who wants to access it will need the password.
What type of encryption do you use to lock the PDF?
Lumr encrypts your PDF with AES-256. This is a strong type of encryption used to protect PDFs with sensitive data. The only people who will be able to access the PDF are those with the exact password you choose to add to it.
Can anyone open my locked PDF without knowing the exact password?
No, when you add a password with Lumr, the newly-protected document can only be accessed if you enter the exact password.
Will the recipient need special software or a specific app to open my protected PDF?
No, you will not need to download any special application or software. Most modern PDF readers can open password-protected documents.
What if I lose or forget the password?
Lumr will never store the new password you add to the PDF. Once you’re finished adding the password to your document, we will retain no trace of the document or its password in our servers.
Is it safe to upload PDF documents to your server to encrypt them?
Yes. It’s safe to upload your PDFs to Lumr. We make sure that your files are kept private throughout the entire process using strong encryption, so you can upload without any worries.
Do I need to download any app or software to password-protect my PDFs?
No, you’ll never have to download any app or install software when you work on PDFs with Lumr. All of our tools (including the password protector) work directly in your browser.
Can I password-protect a PDF on my Android or iPhone?
Yes, you can protect your PDFs from anywhere at any time when you use Lumr. Simply upload the document using your iOS or Android device’s browser, and add the password in seconds.
Security you can trust
Independently audited and compliant with the security and privacy standards your documents demand.
- SOC 2 Type II
- GDPR
- ISO 27001
- HIPAA
- eIDAS
- PCI DSS
Ready to protect your PDF?
Join millions of users who trust lumr to keep their documents private. No fees, no hassle.
- Ready in 3 seconds
- 256-bit SSL secure
- Works on any device