PNG files are wonderful for screenshots, logos, and graphics with transparency — but they are needlessly heavy for photographs. Because PNG is lossless, a single phone photo saved as PNG can be 10 MB or more, where the same image as JPG is well under a megabyte and looks identical. This converter re-encodes your PNG as a high-quality JPG, flattening any transparency onto a clean white background, so your images upload faster, email more easily, and stop eating storage.
It is free, runs entirely online, and never stamps a watermark on your output. Drop in one image or a whole folder; batches are zipped for a single download. If you actually need to keep transparency, the JPG to PNG tool goes the other way.
Why is my PNG so much bigger than a JPG?
PNG compresses without throwing any data away, which is perfect for sharp-edged graphics but wasteful for photographs full of subtle gradients. JPG was designed specifically for continuous-tone imagery: it discards detail the eye cannot easily see and achieves compression ratios PNG cannot touch. For a typical photo the JPG is five to ten times smaller. The only thing you give up is transparency and a sliver of edge precision — neither of which matters for a photograph.
What happens to transparency?
JPG has no alpha channel, so transparent areas have to land on something. We flatten them onto a white background, which is what you want for the vast majority of photos and product shots. If a transparent background is essential — say, a logo destined for a coloured web page — keep the PNG, or use our PNG to WebP tool, which preserves transparency while still cutting file size.
When you should NOT convert PNG to JPG
Skip the conversion for line art, screenshots full of text, icons, and anything with hard edges on flat colour. JPG's lossy compression smears those edges with faint noise that PNG avoids entirely. The rule of thumb: photographs → JPG, graphics and text → PNG. If you need the file smaller but it is a graphic, try the PNG compressor instead.