Upload a PDF
Choose your PDF file from the device or drop it into the upload area.
Free online PDF tool
Protect PDF
Add a real password to a PDF with local browser encryption, plus optional permissions for compatible PDF readers.
Browser ProcessingNo UploadPrivacy FirstLocal ConversionFast
Drop your PDF file here
Drop your file here or choose files. Upload one unlocked PDF file and add a password locally in your browser.
FreeSecureWorks in your browser
Password protection
Your PDF is encrypted locally in your browser with QPDF WASM. Your password and file are never uploaded.
Private by DesignPassword strengthWeak
Use at least 6 characters. A stronger password mixes uppercase, lowercase, numbers and symbols.
Advanced permissions
PDF permissions are respected by compatible PDF readers, but they are not absolute DRM protection. AES-256 encryption and the open password provide the real protection.
Use a separate owner password to change permissions later. Keep it somewhere safe; LiftPDF does not store it.
Visual guide
What this tool does
Use the preview as a mental model: choose files, adjust only the settings that matter, then download the final document or image output. The workflow is designed to stay simple even with many pages.
Simple workflow
How it works
Preview and choose
Check the file summary, pages or options before starting the operation.
Encrypt PDF
Protect PDF runs in the browser and prepares the new file locally.
Download an encrypted PDF
Download a password-protected PDF with AES-256 encryption and verified permission flags.
Practical reasons
Why use Protect PDF?
Keep the workflow simple
Add real password encryption and optional compatible-reader permissions to sensitive PDFs.
Private by design
Security-sensitive files are handled locally so the document and password do not need to be uploaded.
Works anywhere
Use the tool from modern desktop and mobile browsers without installing a PDF app.
Built for everyday files
Features
Browser processing
The file is processed on your device with client-side PDF libraries.
Clear preview
Review the file, pages or selected options before downloading the result.
No account required
Use the tool without sign-in, subscriptions or trial walls.
Responsive layout
The upload, options and download states remain usable on small screens.
Clean file names
Downloaded files use readable names instead of generic output.pdf labels.
Error messages
Invalid files, unsupported states and empty selections are reported clearly.
Perfect for
Common use cases
Students
Prepare class documents, notes and shared materials without desktop software.
Business
Handle receipts, contracts, reports and client documents in a quick browser workflow.
Administration
Prepare files for portals, email attachments and formal submissions.
Design review
Adjust visual documents, proofs or exported PDF pages before sharing them.
Personal documents
Work with tickets, scans, confirmations and archives from your own device.
Mobile tasks
Complete small PDF fixes from a phone or tablet when you are away from a computer.
Complete guide
Best practices before you convert
Use a strong password
PDF encryption is only as useful as the password protecting it. Use a password that is long, unique and not reused from another account.
LiftPDF uses QPDF WASM locally for real PDF encryption. Your password, owner password and permission settings are not uploaded to a server during the process.
Understand PDF permissions
Advanced permissions can request restrictions such as no printing, no copying or limited editing in compatible PDF readers.
These permissions are useful for professional workflows, but they are not absolute DRM protection. The open password and AES-256 encryption are the real access control.
Privacy comparison
LiftPDF vs typical online converters
TopicLiftPDFTypical converter
Browser processingFiles stay on your deviceUsually uploaded first
PrivacyNo document storageDepends on the provider
SpeedStarts immediately after selectionCan wait for upload queues
AccountNo account requiredOften limited by sign-in or trials
Keep working
Useful next tools
Protect a PDF with a password online
LiftPDF uses QPDF compiled to WebAssembly to apply real PDF password encryption locally in your browser. Your file, passwords and permission settings are never uploaded to a server.
FAQ
Can I protect a PDF for free?
Yes. Protect PDF is free to use directly in your browser.
Are my PDFs uploaded?
No. Your PDF stays on your device and is encrypted locally in the browser.
Is the password added locally?
Yes. LiftPDF runs the encryption engine in your browser and does not send your password to a backend.
Can I remove the password later?
You can remove a PDF password later with an unlock tool if you know the correct password.
Does this encrypt the PDF?
Yes. The exported file uses real PDF password encryption and requires the password when opened in PDF viewers.
Can I restrict printing, copying or editing?
Yes. Advanced permissions can request printing, copying and editing restrictions for compatible PDF readers. These permissions are not absolute DRM protection.
Learn more about this task
Related Tools
Keep working with tools that match this PDF workflow.
Unlock PDF
Remove PDF passwords when you have permission.
FreeSecureBrowser
Watermark PDF
Add text or image watermarks to every PDF page.
FreeSecureBrowser
Compress PDF
Rebuild PDFs with safe browser-side compression.
FreeSecureBrowser
Merge PDF
Combine multiple PDF files into one document.
FreeSecureBrowser
Coming Soon
Sign PDF
Add a signature to a PDF document.
FreeSecureBrowser
Private by design
Your files stay in your browser
LiftPDF is built around local browser processing. For the available tools, files are read by your browser, processed on your device and downloaded back to you.
Browser Processing
The current tools process files in your browser using client-side PDF and image libraries.
No File Upload
Your selected documents do not need to be sent to a LiftPDF conversion server.
Private by Design
Sensitive files stay on your device during conversion, editing and export.
Secure Conversion
Protect and Unlock PDF use QPDF compiled to WebAssembly for local encryption tasks.
No server upload
How browser processing works
Your device
You choose files in your browser.
Local processing
PDF.js, pdf-lib or QPDF WASM runs the task locally.
Download
The result is created for you to save.
LiftPDF tools are designed so the selected files are read by the browser and processed on your device. The current tools do not require a document upload API.