Raster and vector are two ways to represent visual content. A raster image records samples on a fixed pixel grid. A vector graphic records shapes, paths, text, fills, strokes, and transformations that a renderer turns into pixels for a particular display or export.
Neither is universally better. Photographs and generated imagery are naturally raster. Logos, icons, diagrams, and typography often benefit from vector structure. Many real projects combine both.
How the representations differ
PNG is a raster format: its decoded result is a rectangular array of pixel samples, with optional alpha. SVG is a vector language for two-dimensional graphics. Shapes remain described as geometry until rendering, so a browser can draw the same circle or path at different sizes without enlarging a fixed source pixel grid.
A vector file can still contain embedded raster images, filters, or effects whose appearance depends on resolution. Likewise, a raster export may originate from clean vector artwork. Inspect the content, not only the filename, when deciding whether an asset is truly editable or scale-independent.
What happens when each format is scaled
Simple vector geometry can be rendered sharply at many sizes because the curves are recalculated for the target. A raster has finite source samples; enlarging it requires interpolation or a learned estimate. That does not make raster unusable—only means the source should contain enough pixels for the destination.
For web layouts, a browser can select suitable raster variants or scale an SVG. The best choice also depends on complexity, file size, animation, compatibility, and whether the asset must preserve exact photographic texture.
Choose by content and workflow
Use raster for photographs, AI-generated scenes, scanned textures, and effects whose detail is naturally pixel-based. Use vector for marks, flat icons, technical diagrams, and editable shapes. Export a raster preview when a receiving system cannot safely accept SVG, and retain the vector master for future sizes.
Transparency is available in both workflows, but it is represented differently: raster formats can store per-pixel alpha, while SVG shapes use painting and opacity properties. A transparent background does not by itself indicate whether a file is vector.
A handoff checklist
Record whether the receiver needs an editable master or a delivery asset. For a logo, provide an authorized vector master plus tested PNG sizes when needed. For a photograph, provide an appropriately sized raster with the required color and transparency behavior. Open every export in the destination rather than relying on the authoring preview.
Treat fonts, external links, embedded images, filters, and scripts as explicit SVG handoff considerations. For raster files, check dimensions, alpha, compression, and repeated re-encoding. A clean format decision reduces avoidable conversion later.
Conclusion
Raster stores pixels; vector stores drawing instructions. Match the representation to the content and keep the best editable master. Next, review image resolution and pixel dimensions or alpha-channel transparency.
Editorial note: This explainer was drafted with AI assistance, then checked and edited against the sources listed below on September 13, 2026. It does not report an unperformed product test.
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