Check Image Sizes in One Drop ImageSizeChecker lets you drop up to 100 images into your browser and instantly see each one's dimensions and file size. Pick a platform preset (Instagram, YouTube, Amazon, and more) or enter your own size rule, and every image gets a clear pass or fail verdict. Everything runs locally in your browser, so your images never leave your device. Free, no signup, supports PNG, JPG, WEBP, GIF, and SVG.