What is a binding margin?
Extra space near the bound edge keeps text and graphics away from a spine, punch holes, or binding hardware.
Mirrored vs single-side
Use mirrored margins for duplex documents so the gutter alternates to the inside edge of left and right pages.
Will my PDF stay private?
The selected file is read and transformed in your browser by this tool; Quicklio does not need to upload it to a server.