libwebp-ffm

Caution

This is a "vibe coded" library (Claude Code / Opus 4.6) that I made because I needed to load webp images in Loritta because Discord doesn't transcode webp images to gif when requested via the media proxy.

It does work, but if you want something battle tested, look somewhere else!

libwebp-ffm is a library that allows you to read webp images via libwebp.

fun main() {
    val inputFile = File("a_451570c96039f873ed5bce9b7d967a8b.webp") // You can also pass a ByteArray
    val image = WebPDecoder.decode(inputFile) // This is a BufferedImage!
}

You can also read webp images via ImageIO.read.

fun main() {
    val formats = ImageIO.getReaderFormatNames()
    println("Registered ImageIO reader formats: ${formats.toSortedSet()}")
    require("webp" in formats) { "WebP format not registered!" }

    val inputFile = File("a_451570c96039f873ed5bce9b7d967a8b.webp")
    val image = ImageIO.read(inputFile)
}

For animated frames, only the first frame is decoded.