I've got drawings and other art on 18x24 inch and larger format papers.
How can I inexpensively crop these papers so that the edges are straight and the corners perfectly right angled? Professionally so?
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The simple DIY way
Use a ruler along the line to be cut. Use a cutter.
The more professional way
Use a paper guillotine.
The advantage of the ruler + cutter is that you can cut lines anywhere, anyhow, even holes. The guillotine will help you get cuts perpendicular to one edge, and the cuts must start at one edge of the sheet.
That's not too big. You may be able to do it with an A3 rotary trimmer, if you cut the ends off first (A3 is 420×297 mm or 11.7×16.5 inches). These are normally slightly oversized (as is the example I linked), and may be sold under other names in places that don't use A-series paper, possibly with a different printed scale but the same overall dimensions. These aren't expensive, and have edges to square up against.
For the finest work I'd trim one sheet at a time, but you can do 5-10 sheets at a time. Mine is only A4, and I mostly use it on photos. With practice you can get the cut in exactly the right place - no photo on the bit trimmed off, no border on the photo.