Fiverr shows your gig image as a small thumbnail in a dense search grid, so the file needs to be light enough to load instantly and clean enough that the title text stays readable when it is shrunk. A gig image that is too heavy slows the listing down; one that is over-compressed turns the lettering into mush. The window between those two failure modes is real but not wide, and it is easy to land inside it if you compress deliberately instead of letting the platform recompress for you. Skwish resizes to a sensible gig-image frame and compresses in the browser with a live before/after size readout, so you pick the smallest file that still reads clearly. Prepare a batch of gig images and portfolio samples in one pass, export them together, and keep every original untouched. Nothing is uploaded to a server, which matters when a client work sample is under NDA.