How to use Lock PDF
- Choose a PDF or supported document file using the upload area. Selected filenames and file size are shown before processing.
- Choose page, quality, compression, security or export options provided by this tool.
- Process the document, preview the result where available and download the finished PDF or converted file.
What Lock PDF does
Add password protection to a PDF using qpdf on your own server.
Result and export
Process the document, preview the result where available and download the finished PDF or converted file.
Privacy and processing
Most PDF operations run in the browser. Server-processed PDF tools include a direct link to the server-side tools section of the Privacy Policy. Read how server-side tools handle requests.
Limits and common errors
Complex fonts, forms, encryption, very large files and advanced document features may not be preserved by every browser-based conversion.
Frequently asked questions
What should I enter?
Choose a PDF or supported document file using the upload area. Selected filenames and file size are shown before processing.
What result will I get?
Process the document, preview the result where available and download the finished PDF or converted file.
Is my information uploaded?
Most PDF operations run in the browser. Server-processed PDF tools include a direct link to the server-side tools section of the Privacy Policy.