The invention relates to the technical field of webpage PHP and especially relates an online video-to-GIF method. The method is characterized by configuring a PHP environment and establishing three folders: frames, gif and video, wherein the frames folder stores JPG screenshots of a video, the gif folder stores JPG-converted single-frame N GIF pictures, and the video folder stores most-original video resources and FFMPEG.exe; and establishing three PHP files: index.php, convert.php and buildingGif.php simultaneously, wherein the index.php is an entry file, and provides an uploading assembly and a submit button for user interaction, the convert.php is a background processing function file, and the buildingGif.php is a PHP file having a GIF synthesis function and referenced by a background. The invention provides the online video-to-GIF method.