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You saved an animated image and it's an .apng file — Animated PNG. Think of it as GIF's technically superior replacement: full 24-bit colour instead of 256, proper alpha transparency, and smaller file sizes for equivalent animation quality. The catch is that almost nobody uses it.
APNG was created by Mozilla developers in 2004 and rejected by the PNG working group, which considered it outside PNG's scope. Despite this, browser vendors implemented it anyway — every modern browser (Chrome, Firefox, Safari, Edge) supports APNG natively. The format is backwards-compatible: if an application doesn't support APNG, it displays the first frame as a static PNG. This graceful fallback was a clever design choice that GIF's successors (WebP animation, AVIF animation) don't share.
Every modern browser displays APNG. Apple Preview and iOS handle them natively. For creating APNG files, APNG Assembler (free, command-line) combines PNG frames. EZGIF.com converts GIF to APNG in the browser. For web use, APNG is genuinely better than GIF — but WebP animation has broader tooling support and similar quality advantages.