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Make the background colour transparent (chroma key).

Key out a colour from every frame.

Flatten every visible pixel to a single colour.

Mosaic every frame into blocks.

Heavily pixelate every frame to hide detail.

Blur every frame.

Draw a caption on every frame.

Stamp a centred watermark on every frame.

Number every frame.

Overlay a running frame/second counter.

Export every frame as an image to step through.

Export GIF frames as PNG images.

Report frame count, size, timing and transparency.

Report whether a GIF is animated and how it plays.

Count transparent pixels per GIF.

Apply an ordered (Bayer) dither to every frame before quantization.

Remove speckle from every frame with a 3×3 median filter.

Displace horizontal slices of every frame for a glitch look.

Reduce every frame to two ink colours by luminance.

Compose GIF frames into a single PNG grid.

Slice a sprite sheet grid back into an animation.

Convert a PNG image into a GIF (one frame per uploaded file).

Convert a still WebP (or PNG) image into a GIF.

Export the first frame of a GIF as a JPG image.