Why it happens

The JPG format has no alpha (transparency) channel. Every pixel must have a solid color, so transparent regions get flattened — to black in many editors, or white in others.

How to fix it

  • Keep transparency: convert your JPG-bound image to PNG or WebP with the tool below; both support transparency.
  • OK with a solid background: flatten onto white intentionally (our compressor fills transparency with white instead of black).

Tips

  • Logos, stickers and cutouts should stay PNG/WebP, never JPG.
  • Once a JPG has baked-in black, the transparency is gone for good — go back to the original PNG.