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Image Format Size Comparator

Drop an image, see file size in JPG vs PNG vs WebP, pick the smallest format that meets your quality bar.

Any web
Format wins by content: photos → WebP usually beats JPG by 20-35%. Logos / line art → PNG is often smaller than JPG and keeps transparency. AVIF (not encoded here — browser support varies) typically beats WebP by another 10-15%, but only Chrome / Edge / Firefox decode it; iOS Safari support is still limited.

About this tool

Different formats win for different image types. PNGs are 5-10x larger than JPG for photos; WebP beats both for everything. This tool encodes the same source as all formats and shows the byte cost.

Format heuristics

  • • Photo (lots of colours / gradients): WebP > JPG > PNG
  • • Logo / line art / icons: PNG and SVG win (and SVG isn't a raster encoding)
  • • Screenshots: WebP usually beats PNG by 30-50%
  • • Transparent images: PNG or WebP (JPG can't do alpha)

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