Upwork's profile photo and portfolio items are the two places a client size you up before reading a word. The profile photo is cropped to a circle at a small size, so a high-resolution photo wastes weight and can still look soft after the platform's own crop, while an over-compressed one looks muddy at a glance. Portfolio items sit in a grid and load one after another, so cumulative file size decides whether the page feels fast or sluggish. Skwish resizes to the frame Upwork actually renders and compresses in your browser with a live size readout, so you can find the smallest file that still looks professional. Do the profile photo and a whole portfolio set in one batch, keep the originals, and never upload client work to a third-party shrinker to get the size down.