Deanimator is a Go package that can detect animated images and "deanimate" them by rendering just the first frame as a static image.

Busy Slack:

Becomes Calm Slack:

Add the module via go mod:

go get github.com/slackhq/deanimator 

When using the module, make sure to import / register the deanimation libraries you want to support (similar to the image package in the standard library). For example:

import (	// Animated GIF image support	_ "github.com/slackhq/deanimator/gif"	// Animated PNG image support	_ "github.com/slackhq/deanimator/png"	// Animated WebP image support	_ "github.com/slackhq/deanimator/webp" ) 

More information can be found in the Go package documentation.