People ask about formats like it is a personality test. It is not. You are usually trying to do something simple: get a form to accept the file, keep a logo sharp, make a page load faster, or open an iPhone photo on a laptop that is older than your sneakers.
The short version
- Photos from a camera or phone for email, chat, or social: start with JPG.
- Logos, screenshots, icons, anything with transparency: PNG.
- Publishing to a modern website you control: WebP is often the lighter choice.
- Got a HEIC that nobody else can open? Convert it before you fight the form.
A little more detail
JPG throws away detail you usually cannot see, which is why photos get smaller. Bad for transparency. Bad for screenshots if you crush the quality too hard.
PNG keeps sharp edges and can do transparency. Great for graphics. Terrible default for big camera photos.
WebP sits in the middle for the web. Smaller photos, sometimes smaller graphics too, and browsers have supported it for a long time now.
HEIC is what many iPhones save. Efficient on the device, annoying everywhere else. Keep it as a master if you want. Make a JPG or WebP copy when the world asks for something normal.
Do not make it worse while converting
Always convert from the best original you have. Turning a tiny JPG into PNG does not invent detail. Saving a logo as JPG "to make it smaller" can wreck the edges forever. On ImageUtils, open Convert, pick the target, drop the file, download. For sites, Optimize for web is often the faster path to a sensible WebP.