Select an image, drag a box over the region you need, and copy the result in either format. Normalized percentages stay valid when the same picture is resized; pixel values match the original file. Nothing is uploaded: the image is processed in your browser only.
選擇圖片後拖拉出範圍，就能複製百分比座標（左上與右下）或像素座標（位置與寬高）。圖片只在瀏覽器裡處理，不會上傳。