PNG and JPG are the two most common image formats on the web, and picking the wrong one means either a bloated file or a blurry, blocky picture. The good news: the decision is usually simple once you know what each format is built for.
PNG: lossless and transparent
PNG uses lossless compression, so it stores every pixel exactly — quality never degrades when you save. It also supports transparency (an alpha channel). That makes PNG the right choice for:
- Logos, icons and illustrations with sharp edges
- Screenshots, especially ones containing text
- Anything that needs a transparent background
- Images you will edit and re-save repeatedly
The trade-off is size: a photo saved as PNG can be several times larger than the same photo as JPG.
JPG: small and made for photos
JPG (also written JPEG) uses lossy compression: it discards detail the eye barely notices to make files dramatically smaller. There is no transparency. It shines for:
- Photographs and realistic images with smooth gradients
- Pictures you need to email, upload or post quickly
- Anywhere file size matters more than pixel-perfect fidelity
The catch is that each save loses a little more quality, and hard edges or text can pick up blocky “compression artifacts.”
Quick decision guide
- Transparency needed? → PNG (or WebP).
- A photo with no transparency? → JPG.
- Logo, icon, screenshot, line art? → PNG.
- File is too big to upload or email? → JPG.
What about WebP?
WebP is a modern format that often gives you the best of both worlds — transparency and photo-grade compression, typically 25–35% smaller than JPG or PNG. If your audience uses current browsers, converting to WebP is a great way to speed up a website. For maximum compatibility with older software, stick with PNG or JPG.
How to convert, privately
You do not need to install anything. These free tools run entirely in your browser — your images are never uploaded:
- PNG to JPG — shrink a PNG photo for sharing.
- JPG to PNG — when you need a lossless copy.
- PNG to WebP — modern, smaller web images.
- Compress an image — keep the format but cut the file size.
Choose the format that fits the job, convert in a couple of clicks, and you get the smallest file at the quality you actually need.