If you’ve ever wondered why an image came out fuzzy, why a file is somehow 12 MB, or why a website flat-out refused your upload, the culprit is almost always the format. There are three you’ll actually run into. Here’s how I think about each one.
JPG, the one built for photos
JPG (same thing as JPEG) is lossy. It quietly throws away detail your eye wasn’t going to notice anyway, and in exchange the file gets tiny. For photographs that’s a great deal.
Where it falls apart is anything with hard edges. Put a logo, a screenshot, or text through JPG and you’ll see ugly smudge around the sharp lines. It also can’t do transparency at all. So: great for the holiday photos, wrong for the company logo.
PNG, the one that keeps everything
PNG is lossless, meaning every pixel survives exactly as it was. It also handles transparency, which is why designers live in it. Logos, icons, screenshots, anything that needs crisp edges or a see-through background, this is your format.
The catch is size. Ask PNG to store a big photograph and the file balloons, because it’s faithfully keeping detail JPG would’ve happily tossed. No animation, either.
WebP, the modern one
WebP is Google’s format, and on paper it wins: roughly 25 to 35% smaller than JPG or PNG at the same quality, with transparency and animation thrown in. If you run a website and care about load speed, it’s a genuinely good idea.
The only real downside is age. Some older desktop programs still squint at WebP and refuse to open it, which is exactly when you’ll want to convert it back to something more universal.
If you just want the short answer
| What you’re doing | Use |
|---|---|
| A photo for the web or email | JPG |
| A logo or screenshot with sharp edges | PNG |
| Smallest possible file on a modern site | WebP |
| Anything needing a transparent background | PNG or WebP |
Switching between them
Whatever you’ve got, you can swap formats in a couple of seconds, and none of it leaves your browser:
- PNG to JPG when a graphic’s really a photo and the file’s too big
- WebP to PNG to rescue a WebP some app won’t open
- JPG to WebP to speed up your site
- All image conversions
Every one of these runs on your own device. The images never go anywhere.