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What is a vector logo and why do I need one?

Short answer: A vector logo is described with geometric shapes instead of pixels: it can be enlarged without ever losing quality, which makes it ideal for printing.

The difference

  • Raster image (bitmap) — PNG, JPEG: a grid of colored dots. Enlarge it and the pixels start to show.
  • Vector image — SVG, AI, EPS: geometric shapes. It resizes with no loss at all, from a badge to a wall poster.

Why it matters to you

With the vector file, your logo can be produced at any dimensions, from a heart placement to a large back print, without ever losing quality. Without it, we are limited by the quality of the file you have.
And you can upload it yourself: the SVG format is accepted on upload. It is in fact the better choice — we take care of converting it, at the exact size of each marking. See What file format should my logo be.
Always keep the vector file your graphic designer produced, even if you have no way to open it. It is the original from which a bitmap of any size can be created — the PNG is only a frozen version of it, made for one specific use at fixed dimensions.
The extension is not enough: an SVG can be nothing more than a bitmap image wrapped in a vector file, and then has none of the qualities described here — see My file is an SVG or a PDF but you say it is not vector.

Going further

What is a vector logo and why do I need one? | DAGOBA