When converting PNG to JPG is the right call
Convert when the image is a photograph. PNG stores every pixel exactly, and photographs have no repeating patterns for it to exploit, so the file stays huge. JPEG is designed for exactly this kind of content.
Also convert when a form or platform requires JPEG — a very common constraint on government portals and older upload systems.
When to keep the PNG
Keep PNG for screenshots, logos, line art, diagrams and anything with text or sharp edges. JPEG smears those edges and leaves visible ringing artifacts around high-contrast boundaries.
Keep it, too, whenever you need transparency — which is the one thing JPEG simply cannot do.
Transparency becomes black or white
JPEG has no alpha channel. When a PNG with transparent areas is converted, those areas must be filled with something — conventionally white, though some tools use black, producing an unpleasant surprise.
If your image relies on transparency, either keep it as PNG or convert to WebP, which supports both lossy compression and an alpha channel.
Frequently asked questions
- Will converting PNG to JPG lose quality?
- Yes, JPEG is lossy — but at quality 90 the loss is not visible for photographs while the file shrinks dramatically. For graphics and text the loss is visible, so keep those as PNG.
- What happens to transparent areas?
- They are filled, since JPEG cannot store transparency. Use WebP if you need both a small file and an alpha channel.
- How much smaller will the file be?
- For a photograph, typically 80–90% smaller. For a screenshot or logo the saving is much smaller and not worth the quality cost.