The three levers of file size

  1. Format — compressing a PNG photo as PNG barely helps; re-encode it to JPG instead.
  2. Dimensions — a 6000×4000 image stays heavy even at low quality; shrink the pixels.
  3. Quality — lowering the JPG quality setting trades detail for size.

How to actually shrink it

  1. If it is a PNG photo, convert to JPG first.
  2. Resize the pixel dimensions to what you actually need (e.g. 1920px wide).
  3. Then run the compressor below and lower quality until it fits.

Tips

  • Flat graphics and text compress poorly as JPG — resize them instead.
  • A file that won't shrink further is probably already optimized.