The Three Main Web Image Formats
For most websites in 2025, you'll be choosing between three formats: JPEG (JPG), PNG, and WebP. Each has distinct strengths, and knowing when to use which can dramatically improve your site's speed and SEO.
JPEG: The Web Standard for Photos
JPEG uses lossy compression optimized for photographs. It's excellent at representing the gradual color transitions in photos while achieving very small file sizes. A 3MB camera photo can easily become 200KB as a JPEG without visible quality loss.
Use JPEG for: photographs, realistic images, product shots, hero images.
Avoid JPEG for: logos, icons, screenshots, images with text, graphics with sharp lines.
PNG: Perfect for Graphics and Transparency
PNG uses lossless compression, meaning no image data is ever discarded. This makes it ideal for images that require sharp edges, text, or transparency. However, PNG files are typically 5–10× larger than equivalent JPEGs for photographic content.
Use PNG for: logos, icons, UI screenshots, images requiring transparent backgrounds, illustrations with flat colors.
Avoid PNG for: full-color photographs where file size matters.
WebP: The Modern Champion
Google's WebP format was designed to replace both JPEG and PNG. It supports both lossy and lossless compression, supports transparency (like PNG), and produces files 25–35% smaller than JPEG at equivalent quality. WebP is supported by all modern browsers as of 2023.
Use WebP for: almost everything on the web — photos, graphics, any image where file size matters.
Format Comparison Table
| Feature | JPEG | PNG | WebP |
|---|---|---|---|
| Compression type | Lossy | Lossless | Both |
| Transparency support | No | Yes | Yes |
| Best for photos | ✓✓ | ✗ | ✓✓✓ |
| Best for graphics | ✗ | ✓✓ | ✓✓✓ |
| File size (photo) | Medium | Large | Small |
| Browser support | Universal | Universal | 97%+ |
How to Convert Between Formats
Noxoro makes format conversion instant. Upload your image, select your target format (JPG, PNG, or WebP), set the quality, and download. Converting a PNG screenshot to WebP can reduce file size by 70% or more.
The Verdict for 2025
Use WebP as your default format for all new web images. Fall back to PNG only when you need maximum lossless quality. Keep JPEG for compatibility with older systems or tools that don't support WebP yet.