APNG vs GIF
APNG extends PNG with animation chunks (acTL, fcTL, fdAT) while staying backwards compatible: software that doesn’t understand them just shows the first frame. Compared with GIF, APNG supports millions of colours and smooth 8-bit alpha transparency, and frame delays can be set to the millisecond. It’s supported by every major browser and used by apps such as Telegram, Discord and LINE for stickers.
Converting an existing GIF keeps its 256-colour frames, so it won’t look better than the source, but you gain a format that editing tools can enhance with full colour and alpha. File size depends on content: flat graphics often shrink, while dithered photographic GIFs can grow.
Related conversions
For a single still, use GIF to PNG. For the smallest animated file, GIF to MP4 is usually best, and GIF to AVIF creates modern stills. Have an APNG and need a GIF? Drop it into Images to GIF or Sticker to GIF.