Pitch decks fail on delivery more than on content. The deck that will not attach, the PDF that takes twelve seconds to render, the slide that shows a placeholder instead of the product shot while someone scrolls on a phone in a lobby — those are all the same problem, and it is weight. A 15-slide deck with eight full-bleed photographs and four product screenshots is routinely 25 to 60 MB, most of it image data, because the source photos came off a camera or a design tool at 4000 px wide and the slide frame is 1920 x 1080. Investors rarely see the original either: it gets forwarded, re-attached, opened in a mail client with a 10 to 25 MB cap, and re-compressed by whatever app it passes through. Preparing the images yourself is the only step that survives that chain. Resize toward the slide frame, compress photographs hard, keep screenshots as PNG so the product UI stays legible, and export the PDF once. Skwish runs the pass in the browser, which matters more for a pitch deck than for most files: nothing about the company's numbers leaves the machine.