SVG vs PNG: When to Use Vector and When to Use Raster
SVG and PNG solve different problems. SVG describes shapes and paths so that a browser can render them at different sizes. PNG stores a grid of pixels with optional transparency. A good asset workflow chooses between them based on the artwork, the destination, and the way the asset will be maintained.
What SVG is good at
SVG is usually a strong fit for:
- Logos, interface icons, and simple illustrations that need to scale.
- Diagrams whose labels, colors, or individual shapes may change.
- Graphics that need CSS styling, DOM interaction, or path animation.
- Assets that benefit from a text-based source in version control.
The source stays inspectable, and an inline SVG can expose its shapes to CSS and JavaScript. An external <img> still scales well, but page CSS cannot reach the elements inside it.
What PNG is good at
PNG is usually a better fit for:
- Screenshots, photographs, and artwork with detailed pixel texture.
- A fixed-size handoff to software that does not render SVG.
- Images where predictable raster output matters more than editable structure.
- A fallback for a complex SVG whose filters or path count are expensive to render.
PNG is lossless, but lossless does not mean small. A large canvas, photographic detail, or a high-density export can make the file substantially larger than a simple SVG.
Compare the formats on real constraints
| Question | SVG | PNG |
|---|---|---|
| Does it stay sharp at several sizes? | Usually yes, when the geometry is suitable | Requires an appropriately sized export |
| Can CSS recolor individual shapes? | Yes when inline | No, not without editing pixels |
| Is the source easy to diff and review? | Yes, it is text | No, the file is raster data |
| Is it suitable for a photograph? | Usually not | Yes |
| Can complex filters affect performance? | Yes, especially with many nodes | The cost is paid during rasterization |
| Does every destination support it? | Check the receiving software | Broadly supported |
The table is a starting point, not a promise. Test the actual asset at the smallest and largest sizes used by your product. A tiny icon with an enormous filter can be a worse SVG than a carefully exported PNG.
A decision workflow
- Identify whether the source is geometry or pixels. A logo made of paths and a photograph have different requirements.
- List the display sizes and whether recoloring, animation, or element-level interaction is needed.
- Check fonts, filters, embedded images, and the number of visible nodes in the SVG.
- Export a representative SVG and PNG and compare file size, sharpness, and rendering time on the target devices.
- Keep the editable source and document the output dimensions, background, and license.
Avoid common mistakes
Do not export every UI icon as a PNG simply because the design tool offers a one-click raster export. You may lose the ability to recolor it for dark mode and may need several density variants. On the other hand, do not force a detailed photograph or a noisy texture into thousands of SVG paths merely to follow a format preference.
Do not judge an export from a screenshot of the editor. A screenshot includes the preview background and the operating system's display scaling. Export from the source with an explicit canvas size and background, then inspect the resulting file independently.
Keep the source useful
For SVG, retain meaningful groups, labels, and IDs that are used by accessibility, scripts, or animation. For PNG, keep the original SVG or design source beside the raster output so that a future color or size change does not require tracing pixels. Record any third-party fonts, illustrations, or embedded images and their permitted uses.
SVGDO lets you inspect the markup, preview the result, optimize a copy, and export a raster version in the browser. Use it as a review step in a larger asset pipeline: the best format is the one that meets the destination's technical requirements and remains maintainable for the people who will edit it later.