Lock PDF online

Allows to print PDF with high quality
Allows to print PDF with low quality
Allows to modify PDF contents
Allows to copy PDF contents
Allows to edit PDF annotations and fill PDF forms
Output Results:
# Output File Source File Action


1. Click "Choose Files" button to select multiple PDF files on your computer. You can also click the dropdown button to choose online file from URL, Google Drive or Dropbox.

2. Set PDF user password which encrypts the file and prevents opening and owner password which specifies operations that should be restricted even when the document is decrypted.

3. Click "Submit" button to start processing. The output files will be listed in the "Output Results" section. Click icon to show file QR code or save file to online storage services such as Google Drive or Dropbox.


The Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems. Each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, graphics, and other information needed to display it.