Flet platform assets

Turns one source image into every app icon and splash screen a platform expects — iOS and macOS asset catalogs, Android mipmaps and adaptive layers, a multi-size Windows .ico, the Linux hicolor tree, and web favicons, maskable icons and splash images.

Try Flet online in Flet Studio

Start your next Flet app in the browser, then use this package locally to prepare its icons and splash screens. Write your own Python code or get help from the AI agent.

Used by flet build, and importable on its own. Pillow is the only dependency; nothing here imports flet or flet-cli.

Rendering is separate from writing

render_*() is pure: it takes images and returns images, never touching the filesystem and never printing. That makes it usable behind a UI that previews icons before anything is built.

from flet_platform_assets import IconOptions, load_source, render_icons, write

source, _ = load_source("assets/icon.png")
result = render_icons(source, IconOptions())

for asset in result.assets:          # preview
    print(asset.relative_path, asset.image.size, asset.image.mode)
for warning in result.warnings:      # diagnostics are data, not log output
    print(warning)

write(result, "build/flutter")       # the only step that touches disk

What it will not do

It never re-frames your artwork. The padding inside your icon is a design decision, so only transforms the platform actually requires are applied — flattening where alpha is rejected, the macOS icon grid, multi-size .ico, opaque maskable icons.

The one exception is the Android 12 splash icon, whose canvas is a platform frame with a guaranteed-cropped outer third; there the artwork is fitted to the visible circle rather than silently clipped.