The central difference is representation: SVG describes graphic objects such as paths, shapes and text, while PNG stores a rectangular grid of pixels. Vector paths in SVG redraw cleanly at different sizes; an embedded bitmap still has its original resolution. PNG has a fixed pixel grid and becomes soft or pixelated when enlarged far beyond it.
SVG vs PNG at a glance
| Question | SVG | PNG |
|---|---|---|
| Graphics model | XML-based vector and mixed vector/raster document | Raster image made from pixels |
| Scaling | Shapes and text redraw at the requested size | Upscaling interpolates a fixed pixel grid |
| Transparency | Opacity, masks and compositing | Alpha channel or palette transparency, depending on PNG color type |
| Best fit | Logos, icons, diagrams, charts and interface graphics | Screenshots, pixel art and raster artwork needing lossless storage |
| Editing | Individual vector objects can remain editable | Pixel-level editing |
| Complex imagery | Can become verbose for highly detailed scenes | Stores complex raster detail directly |
Why SVG usually wins for a logo
A logo often needs to appear on a small navigation bar, a high-density display and a large sign. When the artwork consists of clean paths and shapes, one SVG can cover those sizes without creating separate pixel dimensions. Color and some visual properties can also be controlled in the document or with CSS, depending on how the SVG is embedded.
SVG is not automatically the smallest file. A simple icon may be compact, while a traced photograph with thousands of paths may be larger and harder to maintain than an appropriate raster image. Optimize the actual asset and compare transfer size instead of relying on the extension alone.
When PNG is the better choice
- Screenshots: PNG preserves interface text and sharp pixel edges without lossy JPEG artifacts.
- Raster artwork: Textures, brushwork and pixel-level effects may not have a useful vector representation.
- Pixel art: Exact control of the pixel grid is the point.
- A fixed-size fallback or export: A PNG can be supplied at known dimensions when a receiving workflow cannot accept SVG.
Transparency is not the deciding difference
Both formats support transparency. PNG can store per-pixel alpha in grayscale-with-alpha or truecolor-with-alpha images, and indexed PNG can associate alpha values with palette entries. SVG supports opacity and more document-level compositing features. Choose based on whether the artwork is fundamentally vector or raster, not merely because the background must be transparent.
Beyond logos: practical choices
| Asset | Usually start with | Reason |
|---|---|---|
| Brand mark or simple icon | SVG | Resolution-independent geometry |
| Chart or technical diagram | SVG | Sharp lines and text at multiple sizes |
| Application screenshot | PNG | Lossless reproduction of a pixel interface |
| Detailed raster illustration | PNG or another raster format | Preserves pixel-level detail without tracing |
| Photo | Usually a photographic web format | PNG's lossless storage is often unnecessarily large for continuous-tone photography |
Does converting a PNG to SVG make it scalable?
Not by itself. An SVG can simply wrap a bitmap using an image element, leaving the original pixels unchanged. Automatic tracing creates paths, but small text, gradients and fine outlines may change. If an editable vector original exists, start there. The SVG embedded-content specification distinguishes embedded images from vector geometry.
Choose a PNG export size from its destination
For a logo displayed at 160 × 40 CSS pixels, a 320 × 80 pixel export supplies a 2× raster version. This is a sizing example, not a file-size benchmark. Export from the vector master where possible: enlarging an existing 160 × 40 PNG does not create missing detail. See web.dev's explanation of raster and display pixels.
A useful production workflow
- Keep the editable vector master when the design is genuinely vector.
- Deliver SVG where the channel accepts it.
- Export PNG fallbacks at the exact pixel dimensions required.
- Test both visual output and compressed file size on the real page.
Read how PNG transparency works or compare PNG-8 and PNG-24 export terminology for the next decision.
