The Core Difference
SVG is a vector format — it describes images using mathematical shapes (lines, curves, polygons). It scales infinitely without any quality loss.
PNG is a raster format — it stores images as a grid of pixels. Scaling up causes pixelation.
This single difference drives every other comparison.
Quick Comparison Table
| Feature | SVG | PNG |
|---|---|---|
| Scalability | ∞ — always crisp | Fixed — blurs when enlarged |
| File size (simple graphics) | Tiny (1-10 KB) | Larger (50-500 KB) |
| File size (complex images) | Can be larger | Better for photos/complex imagery |
| Transparency | ✅ Full alpha | ✅ Full alpha |
| Animation | ✅ CSS/SMIL | ❌ (use APNG or WebP) |
| Browser support | All modern browsers | Universal |
| Email clients | ⚠️ Poor (Outlook doesn't render SVG) | ✅ Universal |
| Editable with code | ✅ It's XML | ❌ |
| Photographic content | ❌ Not suitable | ✅ Good (WebP is better for web) |
Use SVG When...
✅ SVG is the right choice for:
- Logos and brand marks — must look sharp at any size, from favicon to billboard.
- Icons and UI elements — 24px icon and 96px icon from the same file.
- Illustrations and diagrams — line art, charts, infographics.
- Animated UI elements — CSS transitions, loading spinners.
- Retina/HiDPI displays — no extra resolution needed.
- When you need to style with CSS — change colors, stroke width dynamically.
<!-- SVG icon that changes color on hover via CSS -->
<svg class="icon" viewBox="0 0 24 24">
<path d="M12 2L2 7l10 5 10-5-10-5z"/>
</svg>
.icon:hover path { fill: #e53e3e; }
Use PNG When...
✅ PNG is the right choice for:
- Screenshots — capturing pixel-perfect UI is what PNG was made for.
- Complex illustrations with many colors — when converting to SVG would be impractical.
- Photos that need transparency — product photos on transparent background.
- Pixel art — where exact pixel placement matters.
- Email campaigns — SVG doesn't render in Outlook.
- Legacy CMS or tools that don't accept SVG.
File Size in Practice
For a logo:
- SVG: 2-8 KB (just mathematical paths)
- PNG at 200×200: 15-50 KB
- PNG at 800×800 (for Retina): 80-200 KB
SVG wins decisively for simple graphics. But for a complex illustration with gradients and textures, SVG can grow larger than a well-optimized PNG.
SVG Security Considerations
SVG is XML and can contain JavaScript, making it a potential XSS attack vector if you allow users to upload SVG files to your site. Always:
- Sanitize SVG before rendering (use DOMPurify or SVGO).
- Serve user-uploaded SVGs with
Content-Type: image/svg+xmland a strict CSP. - Never use
innerHTMLto inject untrusted SVG.
Converting Between SVG and PNG
- SVG to PNG — for platforms that don't support SVG
- PNG to SVG — auto-vectorization (best for simple logos with flat colors)
Note: PNG to SVG auto-tracing works well for simple, flat-color logos. For complex images, the result is a PNG embedded inside an SVG wrapper — not a true vector.
The Verdict
Is it a photo or complex image?
→ Use PNG (or WebP for web)
Is it a logo, icon, or illustration?
→ Use SVG
Does it need to work in email?
→ Use PNG
Does it need to scale perfectly at any size?
→ Use SVG
Related conversions
Most teams that read this guide convert images in one of these directions: