SVG vs PNG: Vector vs Raster, Explained
SVG vs PNG: understand vector vs raster graphics, when to use each format, and why SVGs stay sharp at any size. Convert between formats with our free tools.
Two Fundamentally Different Image Types
PNG stores pixels. SVG stores instructions. A PNG of a circle at 100x100 pixels contains a grid of 10,000 colored dots. An SVG of the same circle contains the text <circle cx="50" cy="50" r="40" fill="blue"/>. The PNG has exactly one resolution. The SVG has infinite resolution: it renders at whatever size you ask for, and it's always sharp.
This distinction drives every decision about which format to use. Get it right and your images are small, fast, and crisp at every screen size. Get it wrong and you either ship blurry graphics or multi-megabyte files that drag down page speed.
PNG (Raster)
PNG is a raster format: a grid of pixels, each with a specific color. When you scale a raster image up, the computer invents new pixels through interpolation, which produces blur. When you scale down, pixels are discarded and fine details vanish.
A 100x100 PNG logo looks sharp at 100x100. At 300x300 it's blurry. At 1000x1000 it's a mess of visible pixel blocks. The only fix is to start with a higher-resolution original and scale down, but that means larger files. A 1000x1000 PNG logo might be 80 KB where the same logo as SVG is under 2 KB.
Real file size examples from a typical logo project:
| Use Case | PNG Size | SVG Size |
|---|---|---|
| Logo at 200x200 | 18 KB | 1.2 KB |
| Logo at 512x512 | 52 KB | 1.2 KB |
| Logo at 1024x1024 | 140 KB | 1.2 KB |
The SVG stays the same size regardless of resolution. The PNG grows quadratically with dimensions.
PNG is the right choice for:
- Screenshots (inherently pixel-based, SVG would be enormous)
- Photographs (also inherently pixel-based)
- Complex images with gradients, shadows, and textures that would produce huge SVG files
SVG (Vector)
SVG is a vector format: mathematical descriptions of shapes. Lines, curves, polygons, and text are defined by coordinates and attributes. No pixels. When you scale an SVG, the browser recalculates the shapes at the new size. The result is always sharp, at any zoom level, on any screen.
A 1 KB SVG logo looks identical at 16x16 (favicon) and 1600x1600 (billboard). Print it on a poster. Embed it in a retina display at 3x resolution. It never degrades.
Beyond resolution independence, SVGs are text files you can edit with any code editor. You can change colors, adjust paths, or add animation by editing the markup directly. No image editor needed. This makes SVGs ideal for icon systems where you need to update colors across dozens of icons to match a rebrand.
SVG is ideal for:
- Logos
- Icons
- Diagrams and charts
- UI elements (buttons, borders, decorative shapes)
- Anything with flat colors and clean edges
- Animated illustrations (CSS and JavaScript can animate SVG elements directly)
Real Deployment Scenario
A SaaS dashboard ships with 40 icons. As PNGs at 48x48 (retina 2x), each icon is about 3 KB. That's 120 KB total, and they're blurry on 3x displays. The same icons as optimized SVGs are about 400 bytes each: 16 KB total, sharp at every resolution, and the browser caches them in the same sprite sheet request. The SVG approach saves over 100 KB per page load and future-proofs for higher-DPI screens.
When SVG Becomes a Problem
An SVG that tries to represent a photograph by encoding every pixel as a colored rectangle produces a multi-megabyte file that renders slowly. SVG is for shapes, not photographs. Converting a photo to SVG gives you a uselessly large file. Don't do it.
Similarly, SVGs with thousands of nodes from auto-traced raster images are bloated. A simple tracing of a 500x500 photo can produce a 3 MB SVG with 50,000 path nodes. Use SVG for human-designed vector art, not for raster-to-vector conversions.
Converting Between Formats
SVG to PNG: use the SVG to PNG Converter. Specify the output resolution. The SVG renders at that resolution and produces a clean PNG. This is useful for platforms that don't accept SVG uploads: social media profile pictures, e-commerce product forms, email signatures, and document embedding.
PNG to SVG: not possible in a meaningful way. You can auto-trace a PNG to produce an SVG approximation, but the result is a rough approximation with thousands of nodes. For logos and icons, redraw by hand in a vector editor.
Optimize SVG: run SVGs through the SVG Optimizer to strip editor metadata, comments, and unnecessary precision. A 15 KB SVG from Illustrator often shrinks to 3 KB after optimization with zero visible difference.
Try it yourself: open the SVG to PNG Converter. Upload an SVG logo. Export at 512x512. The PNG is sharp at that resolution because the source is vector. Now imagine the same logo as a 100x100 PNG scaled to 512x512: it would be a blurry mess. That's the difference between vector and raster in one experiment.