Crop the Margins
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Cut a percentage off each side of every page, so mixed page sizes crop the same way.
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A report often holds A4 body pages and a wider landscape appendix. A fixed margin in millimetres takes the same strip off both, which is a light trim on one and a heavy cut on the other.
A percentage is read against each page's own width and height, so a 5 percent left margin removes a proportional strip whatever the page underneath is.
If the goal is to make the file smaller, use Compress PDF. Cropping changes what is shown, not what is stored.
Past that point a crop stops being a trim and starts being an extraction of a corner, which is almost always a mistake in the numbers rather than an intention. The two opposite sides are also checked together, so they cannot remove the whole page.
Not with this tool. The margins apply to every page. Split the document, crop the part that needs it and merge the result if a single page needs its own treatment.
No. Cropping moves the page boundary, and a reader shows only what is inside it. The content outside remains in the file and can be recovered by widening the boundary again. Redaction is a different operation.
Not meaningfully. Nothing is removed from the page, so the bytes stay roughly the same. Compress PDF is the tool for size.
It crops the same way. A scan is a full-page image, and cropping hides the edge of it, which is the usual way to remove a black scanner border.