PNG vs JPG: Which Format Should You Use?
By the 325Tools Team · Updated 2026-06-20
Quick answer: photos belong in JPG, screenshots and anything with transparency belong in PNG. That one sentence covers 90% of cases. The other 10% is where file sizes surprise people, so here's the reasoning — and a table you can apply in two seconds.
Why the split exists
JPG uses lossy compression tuned for photographs: smooth gradients, natural textures, millions of colors. It throws away detail your eye won't miss, which is why a 12-megapixel photo fits in 2–4 MB instead of 30 MB.
PNG is lossless. Every pixel survives exactly, which is why it's the right choice for screenshots, UI mockups, charts, and logos — sharp edges and flat colors stay crisp, and text stays readable. PNG also supports transparency; JPG simply can't (transparent areas get filled with a solid color, usually white).
The file size reality
The format penalty for choosing wrong is not subtle:
- A photo saved as PNG is commonly 5–10x larger than the same photo as JPG — a 3 MB JPG can balloon past 20 MB — with no visible quality gain. Fix it with the PNG to JPG converter.
- A screenshot saved as JPG is often larger than the PNG would be, and the text gets fuzzy compression artifacts around every letter. Convert back with JPG to PNG won't restore lost detail, so screenshot as PNG from the start.
If a correct-format image is still too heavy, run it through the Image Compressor — photos usually shed another 30–70% with no visible change.
What about the web?
For a modern website, consider a third option: WebP beats both formats on size (roughly 25–35% smaller than JPG, often 50%+ smaller than PNG) and supports transparency. Use it for site assets; stick to PNG/JPG for files you email or hand to other people's software.
When to use each
| Situation | Use | Why |
|---|---|---|
| Photos from a camera or phone | JPG | 5–10x smaller, no visible loss |
| Screenshots, UI, charts | PNG | Text and edges stay sharp |
| Logo or icon over any background | PNG | Transparency support |
| Image will be edited repeatedly | PNG | Lossless — no generational decay |
| Email attachment that's too big | JPG | Convert with PNG to JPG, then compress |
| Your own website | WebP | Smallest files, handles both jobs |
When in doubt: does it contain sharp text, lines, or transparency? PNG. Is it a photo? JPG.