Convert GIF to APNG in Seconds

GIF's animation engine — frame sequencing, per-frame delay, disposal methods, looping — has barely changed since 1989, and it still works. What hasn't aged well is the pixel data sitting inside that engine: every single frame is limited to a 256-color indexed palette, and transparency is a strict either/or with no partial opacity. APNG keeps GIF's entire animation model intact — same frames, same timing, same loop behavior — but replaces the pixel format underneath it with PNG's, which supports 24-bit true color and a full 8-bit alpha channel per frame.

That makes this conversion fundamentally different from flattening a GIF down to a single JPG or PNG: nothing about the motion is discarded. A gradient-heavy animation that looks banded and speckled as a GIF, because every frame had to approximate its colors from a 256-entry palette, keeps every frame but renders each one with the full color range PNG allows. A GIF that uses hard-edged transparency to fake a soft drop shadow or glow can be redone as true, smoothly-anti-aliased alpha transparency once it's carrying real per-pixel opacity instead of a binary mask.

This shows up most with animations that were only saved as GIF because, for decades, GIF was the only animated format with universal support — motion graphics, animated UI mockups, looping product demos, or subtly gradient-shaded loading indicators. None of those needed GIF's palette limitation; they needed GIF's animation support, which is exactly what APNG offers with none of the color compromise. The one real cost is file size: storing full 24-bit-plus-alpha data per frame instead of an 8-bit palette index means an APNG is almost always larger than the GIF it came from.

An animated GIF isn't just a stack of complete pictures — each frame stores instructions for how it should be drawn relative to the one before it, called a disposal method: leave the previous frame in place, clear the region to the background color, or restore whatever was underneath before the previous frame was drawn. Getting this wrong when converting to another animated format produces visible glitches — ghost trails, flickering, or frames that don't line up — so this converter walks through every frame in the GIF, applies its disposal rule exactly as GIF's own animation model defines it, and only then hands the fully composited frame to the APNG encoder.

Frame delays carry over the same way: GIF stores timing in hundredths of a second per the GIF89a specification, and APNG's animation control chunk stores delays in milliseconds, so each frame's delay is converted directly rather than approximated — a GIF that plays back at a particular pace will play back an APNG at that same pace, frame for frame.