One format, two modes
WebP is unusual in covering both jobs. Its lossy mode, derived from the VP8 video codec, competes with JPEG and usually wins on size. Its lossless mode competes with PNG and also tends to produce smaller files. And unlike JPEG, lossy WebP can still carry an alpha channel — so you get transparency and strong compression at once.
That versatility is why sites adopted it widely: one format replaces both the JPEG and the PNG, and the page loads faster for it.
The compatibility catch
Browsers handle WebP universally now, but the wider software world lags. Some desktop editors, office suites, print workflows and upload forms still refuse it. That's the usual reason people convert a WebP back to JPEG or PNG — they saved an image from a website and the rest of their tools won't take it.
Strengths
- Smaller than JPEG and PNG at equivalent quality.
- Does lossy and lossless, both with transparency.
- Supports animation; displayed by every modern browser.
Limitations
- Still rejected by some desktop apps, office tools and print shops.
- Less universal than JPEG/PNG outside the browser.
When to use WebP
Use WebP to make web images load faster. Convert to JPEG or PNG when a tool outside the browser won't accept it.
WebP FAQ
- Why did I download a WebP file?
- Many websites now serve images as WebP because they're smaller and load faster. If your editor or upload form won't open it, convert it to JPEG or PNG.
- Is WebP better than JPEG?
- For the web, usually — WebP files are smaller at the same quality and can include transparency. JPEG still wins on universal compatibility outside the browser.
- Does WebP support transparency?
- Yes, in both its lossy and lossless modes — one of its advantages over JPEG.