GIF libraries for PHP

• GD is bundled with PHP. It reads and writes single-frame GIF with transparency, but loads only the first frame of an animation and can’t write animations. Resizing an animated GIF with GD turns it into a still image.
• Imagick handles animated GIFs fully: iterate frames, read and set delays and the loop count, coalesce, resize every frame and optimize layers before saving.
• Intervention Image supports animated GIF with both the GD and Imagick drivers (it ships its own GIF decoder and encoder for GD): resize and save keep the animation, and you can build animations from images.

• GD PHP's bundled GD extension reads and writes GIF images. How to load and save GIF, keep transparency when resizing, convert PNG to GIF.
• Imagick Imagick is the PHP extension for ImageMagick. How to read animated GIF frames and delays, resize an animated GIF without breaking it.
• Intervention Image Intervention Image handles animated GIF in PHP with the GD or Imagick driver. How to resize an animated GIF, read frames and delays, create an animation.