Convert GIF to PNG without losing the frames you wanted

Going from GIF to PNG means deciding what happens to the movement

One file can hold a hundred pictures. The other holds one. Every tool that offers this conversion has to resolve that, and most of them resolve it silently — you upload something that danced, you get back something that stands still, and nowhere on the page does it say which of the hundred you were given or that the other ninety-nine ever existed.

The frame count is therefore the first thing this page tells you, before a single control appears. If the answer is one, there is nothing to decide and no menu pretending otherwise. If the answer is thirty-eight, you get three routes and none of them is hidden: point at the frame you meant, take all thirty-eight as separate files, or write a picture format that can still move. The choice belongs to you, but the arithmetic that makes it a choice has to arrive first.

Pointing at the frame you actually meant

"First frame" is a guess dressed as a default. The frame worth keeping is usually the one where the caption has finished typing itself, or where the character has landed, or where the chart has drawn its last bar — and that is somewhere in the middle of the sequence, not at the start of it. So there is a slider, a number box and step arrows, all writing to the same value, and the picture beside them updates as you move.

That preview is not a thumbnail of the result. It is the result: the frame is encoded as a complete PNG each time you land on one, and the image you are looking at is byte for byte what the download button hands over. Its true size and its color type sit underneath. There is no step between deciding and getting, and there is nothing to discover afterwards.

Keeping every frame, either as files or as motion

The archive route writes one PNG per frame, numbered with leading zeros so a file manager sorts them in playing order rather than putting frame 10 between 1 and 2. Nothing is merged, nothing is scaled, nothing is thinned out. That is the shape you want if the next step happens in an editor, a video timeline or a sprite sheet.

The other route is APNG — a genuine animated PNG, which sounds like a contradiction and is not. The format has been supported by Chrome, Safari, Firefox and Edge for years, and it beats GIF on the things GIF is worst at: more than 256 colors, opacity that varies smoothly instead of snapping between visible and gone, and timing expressed in milliseconds. Its trap is the extension. An APNG is a .png, so anything that has never heard of the standard reads the first frame, displays it, and reports no problem at all. That makes it an excellent answer for a web page and a poor one for a print workflow or a decade-old desktop application. If the destination is somewhere that only understands video, turning the GIF into an MP4 usually cuts the same animation by an order of magnitude.

GIF and PNG, in brief

GIF

Full name	Graphics Interchange Format
Extension	.gif
Format type	Lossless raster image, 256 colors, animatable
MIME type	image/gif

PNG

Full name	Portable Network Graphics
Extension	.png
Format type	Lossless raster image, with alpha
MIME type	image/png

Why the same file yields an indexed PNG one moment and a truecolor one the next

PNG has two lossless ways to describe a picture. It can store a table of colors and then one byte per pixel pointing into it, or it can store four bytes per pixel outright. Neither loses anything; the table version is simply far smaller when the picture has few enough colors to fit in one, and impossible when it does not.

A single GIF frame almost always fits, because GIF itself works from a table of at most 256. But the format permits a separate table per frame, and a frame painted over two earlier ones can end up showing colors drawn from three tables at once. Ask for that as a still and you get the small kind; ask for an animated PNG of the whole sequence, where every frame shares one description, and the total may well exceed the limit and force the larger kind. The tool counts, says which it will use and why, and never re-quantizes to squeeze under the line — inventing a color that was not in your file is not a size optimization, it is a lie about the contents.

Transparency comes out better than it went in

This is the one dimension where the conversion is an unambiguous upgrade. A GIF marks a single palette entry as invisible and has nothing to say about the space between invisible and solid, which is why cut-outs from GIFs carry that stair-stepped outline and why they show a halo when placed on a background the original did not anticipate. PNG carries a full opacity value per pixel.

Your transparent areas therefore survive exactly, with room to spare. Nothing gets flattened onto a white rectangle — the failure people usually arrive here having suffered somewhere else. The preview draws a checkerboard behind the result so you can confirm it rather than trust it, and the panel reports whether the source had any transparency at all before you run anything.

Where the encoder runs, and what it will not do

Your browser has a GIF decoder, but it will only ever hand back the composited picture it is currently displaying, which is no help when you want frame seventeen. So the container is read here instead: the sub-rectangles, the per-frame palettes and the disposal rules are followed exactly as the specification describes, and each frame is rebuilt as a complete picture. The PNG writer is ours too, feeding rows into the compression the browser already provides. All of it runs on a background thread in your tab, which is why the work starts the moment the file lands rather than after a queue. The question of what a conversion site keeps does not arise when nothing is sent.

What it does not do: no cropping, no resizing, no rotation, no text, no reordering and no speed changes. It does not re-quantize, so it cannot make the file smaller by making it worse. And it will not accept a JPEG or a WebP renamed to .gif — the bytes are checked rather than the extension, and the message says what actually arrived. Going the other direction, a stack of PNGs becomes one animated GIF.