Sometimes the crop box is pretty irrelevant, because it refers to the region to which the page contents are to be clipped. People always use this size for screen display and printing. When you find that the crop box in page of youis surplus, you can remove it by using Advanced PDF Tools Command Line. The is a string of letters and numbers, with corresponding s, you are allowed execute corresponding functions through Advanced PDF Tools.
You can download Advanced PDF Tools through the following link posted below
Do remember extract it after the download is completed, for it is zipped package.
To active this function you are bound to launch the MS-DOS command prompt window, look at the screenshot, and they will assist you
After several steps, you will have the MS-DOS command prompt window
Here, you can type theto remove pdf crop box.
pdftools -i "C:\input.pdf" -o "C:\output.pdf" -X "Crop:Remove"
where the option -i is to specify a name or a directory for input, the option -o to specify the pdf file name for output, and-X is to remove or set Crop, Bleed, Trim, Art boxes, here "Crop:Remove" is to remove pdf crop box
Once the input is done, please press the “enter” key
When you see this, it tells that your operation goes smoothly.
If you are confused with the Crop, Bleed, Trim, Art boxes, you can take the following chart as reference.