About GIF to PNG
GIF is an old format carrying an old limitation: 256 colours per image. Everything you have ever seen described as "GIF banding" — the visible steps in a gradient, the dithered speckle in a photograph — comes from that palette limit. PNG has no such restriction and stores full colour.
Animation is not preserved. This is the important thing to know before converting. PNG holds a single image, so an animated GIF gives you only its first frame. If you need the animation, you need a video format or an animated WebP, neither of which is produced here. If you only wanted a still — a thumbnail, a poster frame, a screenshot of the first moment — this is exactly right.
Transparency survives, and improves. GIF supports transparency but only as a single on/off bit: a pixel is either fully transparent or fully opaque, which is why GIF logos often show jagged edges against a coloured background. PNG has a full alpha channel with 256 levels of opacity, so the conversion preserves what transparency exists — though it cannot invent the smooth edges the GIF never had.
Expect the file to change size unpredictably. A simple GIF of flat colours may become a smaller PNG, since PNG compresses flat regions well and does not carry GIF's palette overhead. A dithered photographic GIF will usually get larger, because the dithering pattern is noise and noise does not compress losslessly.
What conversion cannot fix. Colour discarded when the image was reduced to 256 shades is gone permanently. PNG will faithfully store the banded, dithered result at full colour depth — a technically better container holding the same degraded picture. If the original exists in another format, work from that instead.
A note on screenshots. A surprising share of GIFs in circulation are screenshots that were saved in the wrong format years ago. Those convert extremely well: flat interface colours are exactly what PNG compresses best, so the result is usually both smaller and visibly cleaner than the source.
Conversion runs in your browser; nothing is uploaded.
Questions
Will the animation be kept?
No. PNG holds a single image, so you get the first frame only. Animation needs a video format or animated WebP.
Is transparency preserved?
Yes, and PNG improves on it — GIF transparency is a single on/off bit, while PNG has 256 levels of opacity.
Why did the PNG get bigger?
Dithered photographic GIFs contain noise, which lossless compression cannot reduce. Flat-colour GIFs often get smaller instead.
Will converting restore lost colours?
No. Colour discarded by the 256-colour GIF palette is gone permanently. PNG stores the banded result faithfully at full depth.