From shrinking a photo for a web page to pulling a color palette out of a logo, these tools handle the common image jobs directly in your browser.
Large images are the most common cause of slow pages. Resize to the size you actually display, pick a modern format such as WebP, and compress with a quality between 75 and 90 percent to cut file size dramatically with little visible change.
Images are decoded and re-encoded by your browser, so private photos, screenshots and client artwork are never uploaded. Keep the original files as masters, since each lossy save removes a little detail.
A typical flow is crop, then resize, then convert to AVIF or WebP, then compress one last time to hit a target file size. The screenshot beautifier and watermark adder are best applied right before export, once the final dimensions are locked in.