Users can drag and drop files, select multiple images, or paste an image from the clipboard; registration is not required for basic use. The service supports formats including JPG, PNG, WebP, GIF, BMP, SVG, and ICO, then creates shareable short links and ready-to-copy Markdown or HTML code for websites, forums, social media, and collaborative work.

Image controls include optional password protection and configurable expiration times. Upload allowances depend on account type: visitors, free members, and paid subscribers have different file-size and upload limits. Free and paid membership plans also offer storage, albums, and short links, while subscriptions remove support pop-ups and provide higher usage allowances. Listed paid plans include supporter and advanced tiers, with monthly pricing in New Taiwan dollars and payment by credit card. duk.tw also provides usage guidance explaining image-hosting benefits and how to embed uploaded images using Markdown or HTML.