I want to delete all the items in the pdf file at once. I do it manually and it's tiring
You need to be more specific. What "items" are you referring to, exactly?
image or icon or object
There's no such option in Acrobat.
You could write a plug-in using the Acrobat SDK to delete these objects from the content stream.
YOU HAVE THIS PLUGIN ?
I don't have it now, but I could write it.
can help me i cant login in site
In the preflight tool of Adobe Acrobat Pro try the fixup "Create different layers for vector, text, image".
i wants know how do that