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SVG (Scalable Vector Graphics) and PNG (Portable Network Graphics) are both common web image formats, but they are fundamentally different types of graphics. SVG describes images using mathematical formulas; PNG stores every individual pixel. Understanding this core difference is the key to choosing the right format for every job.
SVG scales infinitely without any loss of quality, because it stores shape descriptions rather than fixed pixels. Whether displayed on a smartwatch or a 4K monitor, an SVG graphic stays crisp and sharp. This makes SVG the natural choice for logos, icons, illustrations, and infographics. PNG is a fixed-resolution format; enlarge it and you get visible pixelation. On high-DPI displays (like Retina screens), serving PNGs typically requires providing 2x or 3x size versions to avoid blurriness.
For simple graphics—logos, icons, line art—SVG files are typically far smaller than PNGs. A simple vector icon might be 1–5 KB, while an equivalent crisp PNG at multiple resolutions could be 10–50 KB or more. However, for complex illustrations with thousands of paths, or for photographic content, SVG files can become enormous. In those cases, PNG (or WebP/JPG) is more efficient.
Both formats support transparency. PNG handles alpha-channel transparency with full 8-bit precision, making it excellent for smooth semi-transparent effects. SVG supports opacity via CSS and attributes, and also enables complex masking and gradient transparency effects that go beyond what raster formats can do.
SVG supports CSS animations and SMIL animations natively in the browser, enabling smooth vector animations without additional image assets. Standard PNG does not support animation; APNG (Animated PNG) adds it but has limited tooling support.
SVG can be embedded as an image (<img src="icon.svg">) or inlined directly into HTML, which allows CSS and JavaScript to dynamically change colors, paths, and other attributes. This makes SVG the format of choice for UI component libraries and icon systems. PNG is used only as an image tag or CSS background and cannot be programmatically modified after rendering.
Figma, Adobe Illustrator, Sketch, and other major design tools fully support SVG import and export. SVG travels between tools without lossy conversion. PNG is universally supported by every image editor and is the standard format for screenshots and raster compositing—but once exported, the vector detail is gone forever.
| Feature | SVG | PNG |
|---|---|---|
| Scalability | Infinite, no quality loss | Fixed resolution; pixelates when enlarged |
| File size (simple graphics) | Very small (1–5 KB) | Larger (needs multiple resolutions) |
| Complex images / photos | Not suitable | Suitable |
| Transparency | Yes | Yes |
| Animation | Yes (CSS / SMIL) | APNG (limited) |
| Modifiable with CSS / JS | Yes | No |
| Browser support | All modern browsers | 100% |
| Best for | Logos, icons, illustrations, UI components | Screenshots, photos, complex raster art |
The rule is simple: use SVG for geometric shapes, logos, icons, and UI components; use PNG (or JPG/WebP) for photos, screenshots, and complex raster images. Most modern design systems use both: SVG handles all scalable icons and illustrations, while PNG or WebP handles photographic content. Choosing the right type for the job is more important than any debate about which format is “better.”
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