Choosing the wrong image format is one of the most common ways people accidentally bloat their websites or lose quality they didn’t need to lose. Here’s what actually separates JPG, PNG, and WebP — and which one you should reach for in different situations.
JPG (JPEG)
JPG uses lossy compression, meaning it throws away some image data to shrink file size, and it does this especially well with the kind of soft color gradients found in photographs. The tradeoff is that JPG doesn’t support transparency, and saving the same file repeatedly introduces visible artifacts over time. JPG is the right default for photographs, product shots, and any image where a small, invisible quality tradeoff is worth a much smaller file.
PNG
PNG uses lossless compression — nothing is thrown away, so text stays crisp and sharp edges stay sharp. PNG also supports transparency, which makes it the standard choice for logos, icons, screenshots, and any graphic that needs to sit on top of a different background color. The cost is file size: a PNG version of a detailed photograph can be five to ten times larger than an equivalent JPG with no visible quality difference to most viewers.
WebP
WebP is a newer format built specifically to solve the JPG-vs-PNG tradeoff. It supports both lossy and lossless compression, supports transparency like PNG, and typically produces files 25–35% smaller than a comparable JPG at the same visual quality. Nearly all modern browsers support WebP today, which is why many websites now serve it by default for faster page loads.
Which format should you actually pick?
- Photographs for the web: JPG or WebP
- Logos, icons, or anything needing transparency: PNG or WebP
- Screenshots with text: PNG (JPG compression can blur small text)
- Fastest possible page load: WebP, when your platform supports it
- Maximum compatibility with old software: JPG or PNG
You don’t have to choose just once
The best approach for most people is keeping a high-quality master copy (often PNG) and exporting whatever format fits each specific use — JPG for the blog post, WebP for the website, PNG for the logo file you hand to a printer. A resizer that lets you convert format on the fly, like ResizeImg, makes this a one-click decision instead of a reason to keep three separate versions of every image on your hard drive.