PNG to JPG with black background

The white halo

The grey rim people see on white backgrounds has a mirror image on dark ones. A logo or a product cut out of a white backdrop keeps a trace of that white in every part-covered pixel along its edge. Put it on black and those pixels light up as a thin outline that was never part of the artwork.

On this page the matte starts black, the edge repair is on, and the magnifier under Edges opens on the brightest rim in your picture rather than the busiest edge, because on a dark ground that is the fault worth looking at.

Three steps

1. 1Open or paste the PNG. Black is already under the transparent parts.
2. 2Look at Edges: the rim at 400%, with the repair on and off.
3. 3Save. The size on the button is the size of the file.

Questions about black backgrounds

Why is there a white outline around my picture on black?

The artwork was cut out of a white or light background, and the part-covered pixels along its edge still carry some of that white. On a white page it is invisible; on black it shows as a thin bright halo. The edge repair takes each of those pixels' colour from the nearest solid pixel of the artwork before the black goes under it.

My PNG turned black everywhere in another converter. Is this the same?

No — that is the opposite problem: the converter put black under every transparent pixel without asking. Here black is a choice you made on purpose, and the page shows what it does to your worst edge before writing anything.

Is the black exactly black?

Yes: zero on all three channels under the transparent pixels. JPEG rounding can lift a few pixels of a pure black area by a level or two; the precision encoder at quality 90 or more keeps that to almost nothing.

Can I use a dark grey instead?

Yes. Under Matte, Pick a colour takes any hex, or use the background-colour page to take the exact colour from a screenshot of where the picture is going.

Next steps

• PNG to JPG background colourAny colour, matched to the destination.
• PNG to JPG on whiteThe commoner case, and the grey rim.
• The two edge faultsWhy the halo and the rim are opposite repairs.