What happens to transparent pixels?

JPEG has no alpha. They are painted with the background color (white by default) before encoding.

Should logos be JPEG?

Usually no. Sharp edges and type look better as PNG or WebP. Photos are the JPEG use case.

PNG to JPG Converter

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PNG to JPG flattens transparency

JPEG has no alpha channel. Transparent pixels are painted onto the background color you pick, then encoded as JPEG. Need the alpha back as a file? Use JPG to PNG only if you still have the original PNG. Smaller files with alpha: WebP converter.

PNG to JPG Converter FAQ

What happens to transparent pixels?: JPEG has no alpha. They are painted with the background color (white by default) before encoding.
Should logos be JPEG?: Usually no. Sharp edges and type look better as PNG or WebP. Photos are the JPEG use case.

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Resize by pixels, percent, or longest side. JPEG, PNG, or WebP out.

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PNG compressor

Reduce PNG size by scaling or converting to WebP or JPG.