Inspect the worked examples
Each note states the input, environment, method and result so a reader can reproduce it. A controlled fixture or geometry calculation can explain one behavior; it cannot predict every seller photo, browser or marketplace pipeline.
What is measured
The format comparison records actual bytes from six inputs: two photographs and four generated test fixtures. The crop example publishes the resulting frames. The memory note estimates one decoded RGBA buffer from pixel count.
What the results do not prove
The inputs are identified, licensed and downloadable. Their byte counts are not a universal format ranking. Geometry does not recreate an Etsy or Shopify theme. Memory arithmetic is not a device limit. Use the local tools to test your own files and inspect the actual destination preview.
JPG, PNG and WebP Compared
Six downloadable inputs and actual format exports show how photographs, text, patterns and noise change file-size results.
Rechecked 2026-10-20Worked crop exampleHow Center Crops Work
Inspect actual square, landscape and portrait files from one image, with the retained dimensions and removed edges explained.
Rechecked 2026-10-20Technical explanationWhy Small Files Need Memory
Compare actual compressed file sizes with a transparent pixel-buffer calculation, without claiming a device memory benchmark.
Rechecked 2026-10-20