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How to make transparent-background icons for app projects with GPT Image Skill

Generate an icon with a transparent background and check that the PNG really has alpha.

  • Content
  • Intermediate
  • 30 minutes
  • From the README
  • Codex
  • Claude Code

Who it is forA developer building a small app or website who needs logo-style icons that sit cleanly on any background.

The problemMany image tools return a solid background, so the icon needs manual cutting before it can be used.

The outcomeA transparent PNG icon in /generated-images, passed through the bridge's alpha check.

What you need first

  • A ChatGPT or Codex plan that permits image generation (the README says Codex image generation is not available on the Free plan)
  • Node.js 22 or newer
  • Git, for installing from GitHub
  • Codex CLI signed in with ChatGPT, or a host that provides subscription-native image_gen

Steps

  1. Ask for the icon with the transparency request stated, for example $gpt-image Create a flat blue robot app icon with a transparent background, 1:1, high quality. (inferred, check the README)
  2. Use --background transparent only when the transparency is requested, as the README advises.
  3. Open the returned PNG and confirm the background is transparent in an image viewer that shows alpha.
  4. Copy the icon into your app's asset folder and reference it from there.

Prompt for your agent

Using GPT Image Skill in <repo path>, generate a flat icon of <icon subject> at 1:1 with a transparent background. Expect a transparent PNG under /generated-images with a PATH=... line. Verify the file has an alpha channel before it is used in <project path>.

Caveat. The README does not promise identical pixel dimensions, since exact sizes may vary with built-in image generation.

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