17Puzzle is a free online image editing tool that combines collage making, long image stitching, text editing, watermark creation, and QR code generation into one. Photo data processing runs only in the browser's memory and is not uploaded to any server—all operations are completed locally to ensure privacy and security. It supports batch image uploads and offers a variety of grid layouts and customization options, such as adjusting corner radius, spacing, and background color. When exporting, you can choose between JPG or PNG formats, with no official watermark. It provides two core modes: layout collage and long image stitching.