What happens when an SVG becomes a JPG
JPEG is a photographic format: it has no alpha channel and compresses by discarding detail the eye is least sensitive to. Converting a vector graphic to JPG therefore involves two decisions the tool makes explicit — what colour fills the transparent areas, and how much quality to trade for file size. The SVG is first rasterised with resvg in your browser at the size you choose, then encoded to JPEG with your browser's own encoder. Nothing is uploaded.
Background colour
White is the default because most documents, listings and emails sit on white. Choose Black for dark UIs or a custom colour to match a specific brand background. Because anti-aliased edges are blended against this colour, pick the colour the JPG will actually be placed on, not just a neutral one — a logo flattened onto white and then shown on grey will have a faint halo.
Quality
The slider runs 40–100. For icons, logos and flat illustrations stay at 90 or above: sharp edges are where JPEG artefacts show first. For complex gradients and photo-like artwork, 75–85 usually halves the file size with no visible change. If you find yourself pushing quality up to keep edges clean, the honest answer is that PNG or WebP is the better format — see SVG to PNG and SVG to WebP.
When you actually need JPG
Some platforms only accept JPEG uploads: certain marketplaces, print-on-demand services, older CMSs, and many email tools. Some print shops ask for JPEG proofs. In those cases convert at 2×–4× scale so the result stays sharp when printed or zoomed, and keep the original SVG as your master file.