Protect your PDFs
with a 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
Protect in 3 easy steps
Upload your file
Upload the PDF you want to lock with a password.
Set a password
Choose a strong password, we use it to encrypt your document.
Download or share
Download your protected PDF and share it with confidence.
One place for every PDF task
Every tool you need to edit, convert, sign, and manage your PDF documents.
Same document, locked tight.
Add a password and your PDF is encrypted. Here is the same document before and after protection.
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
The PDF protector people
actually rely on
Strong encryption, full control. Everything you need to password protect PDFs online.
Bank-grade encryption
AES-256 secure
Your PDF is encrypted with AES-256, the same standard trusted by banks and governments.
Your password, your rules
You stay in control
Only people you share the password with can open the document, nobody else gets in.
Restrict what others can do
Limit copy and print
Stop recipients from copying, editing, or printing your PDF without permission.
Protect in bulk
Many files at once
Lock several PDFs in one go and download them together, no repeating yourself.
Private and secure
AES encrypted
Your files are encrypted in transit and processed securely. We never share your documents.
Works in your browser
Any device, no install
Protect PDFs on desktop, tablet, or phone, nothing to download or install.
Trusted every day,
by people like you
See what people are saying about protecting PDFs with lumr.
TrustScore 4.6 · Based on 3,247 reviews
“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
We answer
your questions
Everything you need to know about password protecting PDFs online.
We encrypt your PDF with AES-256, a strong industry standard trusted by banks and governments. Only people with the password can open the file.
We never store your password, so we cannot recover it for you. Keep it somewhere safe, without it the document cannot be opened.
Absolutely. Your files are encrypted with AES during transfer and processed securely. We follow GDPR best practices and never share your documents with third parties.
Yes, you can protect several PDFs in one session and download them together, no need to repeat the steps for each file.
You can upload PDF files up to 100 MB. For most documents this is more than enough. Larger files can be split first with our Split PDF tool.
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