apng
What is a .apng file?
image/apng
APNG (Animated PNG) extends the PNG format with animation by adding frame-control chunks while remaining backward compatible with static PNG decoders. It supports full 24-bit color and 8-bit alpha per frame, unlike GIF's 256-color limit. It is used for high-quality short animations.
How to use a .apng file
Use an example APNG to test animated-PNG decoding, backward-compatible fallback to the first frame in older decoders, and conversion to and from GIF or WebP.