- SVG viewBox
- An attribute in SVG files that defines the internal coordinate system: four values specifying the origin x, origin y, width, and height of the drawing canvas. The viewBox is what allows the tool to auto-calculate the output aspect ratio when you specify only one output dimension.
- Rasterise
- The process of converting a vector graphic (defined by mathematical curves and shapes) into a raster image (a fixed grid of pixels). Rasterisation is irreversible — the resulting PNG cannot be scaled up without quality loss, unlike the original SVG.
- Transparent PNG
- A PNG file that includes an alpha channel, allowing individual pixels to be fully or partially transparent. Transparent PNGs composite cleanly over coloured backgrounds without a visible white or black bounding box around the graphic.
- Retina (2x/3x)
- Display technology that packs more physical pixels into each logical pixel. A retina screen has a device pixel ratio (DPR) of 2 or 3, meaning an image exported at 2x or 3x the intended CSS size renders sharply instead of appearing blurry.
- Vector
- An image format that stores shapes as mathematical descriptions — points, curves, and fills — rather than pixels. Vector files like SVG can be scaled to any size without loss of quality because the renderer re-calculates the pixel output for each new size.
- Anti-aliasing
- A rendering technique that blends edge pixels with the background colour to produce smooth, non-jagged curves and diagonal lines at any resolution. The browser's SVG renderer applies anti-aliasing automatically, which is why exported PNGs look smoother than screenshots taken with integer scaling.