Image Format Converter

Convert an image between WebP, JPEG, PNG, GIF and BMP, and see exactly how much smaller — or larger — the result is.

Your file is decoded, re-encoded and handed back. Nothing from the original survives except the pixels, so EXIF and GPS data are gone. Uploads and results are deleted after fifteen minutes.

How it works

Choosing a format is really choosing what you are willing to lose. JPEG throws away detail your eye is bad at noticing and is superb at photographs; it is poor at sharp edges, which is why screenshots and logos go blotchy in it, and it has no transparency at all. PNG is lossless and keeps an alpha channel, which makes it right for logos, screenshots and anything with flat colour — and wrong for photographs, where it is often several times the size of an equivalent JPEG.

WebP is the one to reach for by default now. It does both: lossy compression that beats JPEG by roughly 25–35% at matched quality, and a lossless mode with transparency that beats PNG. Every current browser supports it, and has since 2020. The practical reasons not to use it are old software and email clients, not browsers.

GIF is limited to 256 colours per frame and survives only for animation; for a still image it is worse than PNG in every respect. BMP is uncompressed and exists here for the rare tool that demands it.

Two things are worth knowing about what conversion costs. First, lossy to lossy is destructive: a JPEG converted to WebP is compressed a second time, over artefacts the first pass already introduced. Convert from the original wherever you still have it. Second, going from a transparent PNG to JPEG has to put something behind the transparent pixels — white, here. That is not reversible, and it is why a logo converted to JPEG can never be dropped onto a coloured background again.

Every conversion here also strips metadata, because re-encoding from a pixel buffer cannot carry it. Usually that is what you want: camera photos routinely embed GPS coordinates, and uploading one to a public site publishes where it was taken. If you need the EXIF kept, this is the wrong tool.

Frequently asked questions