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App Icon Generator

An app icon generator takes a single high-resolution source image (typically 1024×1024 PNG or SVG) and outputs every icon size required by iOS, Android, web favicon standards, and PWAs — eliminating the manual resize / export rountine for the dozens of files modern apps require. The ZTools App Icon Generator runs entirely in the browser, generates the standard size sets per platform (iOS: 20–1024px; Android: mdpi–xxxhdpi 48–192px + adaptive icon layers; web: favicon.ico + apple-touch + manifest), and packages all output into a downloadable ZIP.

Use cases​

New iOS / Android app launch​

Apple requires ~12 icon sizes; Google requires multiple density buckets + adaptive icon layers. Hand-resizing eats half a day; generator does it in 30 seconds.

Web app / PWA setup​

PWA needs favicon (16px, 32px), apple-touch (180px), manifest icons (192px, 512px). Generator outputs the set + a manifest.json snippet.

Browser extension icon​

Chrome / Firefox extensions need 16px, 48px, 128px (Chrome) or 16/32/48/96 (Firefox). Generator handles both browsers from one source.

Brand refresh​

Updated logo: regenerate the entire icon set in seconds. Push to all platforms simultaneously without re-doing manual resize.

How it works​

  1. Upload source image — SVG (preferred — vector, infinite resize) or 1024×1024 PNG (high enough for the largest output). Square aspect ratio required.
  2. Pick target platforms — iOS, Android, web, PWA, browser extension. Multiple selectable; tool generates all chosen sets.
  3. Configure adaptive icons (Android) — Android adaptive icons require foreground + background as separate layers. Tool can generate from a single source with auto-padding, or accept separate layers.
  4. Generate set — Tool resizes the source to each platform's required dimensions. SVG → PNG via Canvas; PNG → smaller PNG via downsampling.
  5. Download ZIP — All generated PNGs in folder structure matching each platform's expected layout. Drop into your project; reference per platform docs.

Examples​

Input: 1024×1024 source PNG → iOS + Android + PWA

Output: ZIP with ~30 PNG files; iOS folder, Android folder (per density), PWA folder.

Input: SVG source with adaptive icon layers

Output: Android adaptive icons in foreground + background layers; classic icons fall back for older Android.

Input: Browser-extension only (Chrome)

Output: 16px, 48px, 128px PNGs + manifest.json snippet ready to drop into a WXT or vanilla-MV3 project.

Frequently asked questions​

What size source should I use?

SVG = infinite (resize without quality loss). PNG = at least 1024×1024 (the largest needed by iOS). Smaller sources upscale poorly.

Why does Android need so many sizes?

Android supports many screen densities (mdpi, hdpi, xhdpi, xxhdpi, xxxhdpi) — each gets its own optimised icon. Plus adaptive icons for modern Android (8.0+) introduce a separate foreground+background layer system.

What about iOS adaptive icons (iOS 18+)?

iOS 18+ supports tinted / dark / clear modes from a single icon. Generator can produce variants; final tinting is iOS-side.

Is the source image uploaded?

No — Canvas processes entirely in the browser. Your icon stays private.

Are favicon.ico files generated?

Yes — favicon.ico bundles 16px + 32px + 48px PNGs into the legacy ICO format for older browser compatibility.

Can I regenerate just one platform later?

Yes — pick only the platform you need; other folders skipped.

Tips​

  • Always start from SVG when possible. Vector resize beats any pixel-based downsampling.
  • Test the smallest size (16px favicon, 24px notification) — many designs work at 1024px but lose detail at 16px. Simplify if needed.
  • Use the same icon across platforms when possible — brand consistency. Slight per-platform optimisations only when needed.
  • For PWA, manifest icons (192, 512) are the most important — they show on home-screen install.
  • Re-run the generator on every branding update; missing size = wrong icon shown on a niche device.

Try it now​

The full App Icon Generator runs in your browser at https://ztools.zaions.com/app-icon-generator — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-05 · Author: Ahsan Mahmood · Edit this page on GitHub