Quick Answer
Photos and realistic images: Use JPG for smaller file sizes. Graphics with transparency: Use PNG. Modern websites: Use WebP. Logos and icons: Use SVG for resolution-independent graphics.
Format Comparison
| Feature | PNG | JPG | WebP | SVG |
|---|---|---|---|---|
| Transparency | Yes | No | Yes | Yes |
| Compression | Lossless | Lossy | Both | N/A |
| File Size | Large | Small | Smallest | Tiny* |
| Quality Loss | None | Yes | Optional | None |
| Scalability | Fixed | Fixed | Fixed | Infinite |
| Browser Support | Universal | Universal | 96%+ (all modern browsers) | Universal |
| Best For | Screenshots | Photos | Web images | Icons/logos |
*SVG file size depends on complexity. Simple icons are tiny; detailed illustrations can be large.
PNG: Portable Network Graphics
PNG is a lossless raster format, defined by the W3C PNG specification, that preserves every pixel exactly. It supports full transparency (alpha channel), making it important for graphics that need to overlay other content.
When PNG makes sense
- Screenshots: Preserves text and UI elements crisply
- Graphics with transparency: Logos on varied backgrounds
- Digital artwork: Illustrations with flat colors and hard edges
- Text overlays: Any image where text must remain sharp
Limitations
- Large file sizes: A single photo at 4000x3000 can be 15MB as PNG vs 2MB as JPG
- Fixed resolution: Cannot scale up without losing quality
JPG (JPEG): Joint Photographic Experts Group
JPG uses lossy compression, based on the JPEG standard (ITU-T T.81), to achieve small file sizes. It discards image data that humans cannot easily perceive, making it ideal for photographs where small imperfections are not visible.
Best uses for JPG
- Photographs: The standard format for digital photos
- Complex images: Scenes with many colors and gradients
- Web images: When file size matters more than pixel perfection
- Email attachments: Smaller files send faster
Limitations
- No transparency: Cannot have transparent backgrounds
- Lossy compression: Each save degrades quality slightly
- Artifacts: Sharp edges and text can show compression artifacts
WebP: Modern Web Format
WebP was developed by Google to replace both PNG and JPG on the web. It offers superior compression while supporting both lossy and lossless modes, plus transparency.
Best uses for WebP
- Website images: Smaller files mean faster page loads
- Web applications: Reduced bandwidth for image-heavy apps
- E-commerce: Product images that load quickly
- Any PNG or JPG replacement: When you control the viewing environment
Limitations
- Compatibility: Older browsers and some software do not support WebP
- Editing software: Not all image editors can open WebP files
- Social media: Try uploading a WebP to Twitter. It silently converts to JPG
SVG: Scalable Vector Graphics
SVG is completely different from other formats. Instead of storing pixel data, it describes graphics using geometric coordinates and vector paths, as defined in the W3C SVG 2 specification. This makes SVG images resolution-independent: they scale to any size without losing quality.
Best uses for SVG
- Logos: Perfect at any size, from favicon to billboard
- Icons: Crisp at all resolutions, easy to color with CSS
- Illustrations: Flat artwork and diagrams
- Charts and graphs: Data visualizations that scale cleanly
- Animations: Can be animated with CSS or JavaScript
Limitations
- Not for photos: Cannot represent photographic content
- Complexity limits: Highly detailed SVGs can be larger than raster equivalents
- Compatibility: Some contexts require raster formats (app icons, social media)
Detailed Comparisons
Still not sure which format to choose? These guides compare specific format pairs:
Sources and references
Convert with confidence
When you need to convert between these formats, our tools process everything in your browser. Your files never leave your device, there is no upload, and no server ever sees your images. Open your browser DevTools and check the Network tab to verify.