About

This tool is an advanced, client-side favicon processor designed for modern web standards. Unlike basic converters that simply resize an image, this engine ensures Maximum Lovable Product quality by generating the complete suite of assets required for iOS, Android, Windows Tiles, and Desktop browsers.

It addresses the specific constraints of the ICO format, which acts as a container for multiple bitmap resolutions (typically 16x16, 32x32, and 48x48). The generator also synthesizes a standard site.webmanifest file for PWA (Progressive Web App) compatibility, extracting the dominant color from your source image to populate the theme_color property.

Formulas

The generator constructs a binary ICO file by concatenating a Directory Header with raw PNG byte streams. The structure follows this strict byte layout:

{

Header: 6 Bytes (Reserved, Type, Count)Directory: 16 Bytes per image (Width, Height, Offset)Data: Variable Length (Raw PNG Blobs)

For ZIP compression, the tool utilizes the STORE method (Compression Method 0), as the constituent PNG files are already compressed, negating the need for Deflate algorithms.

Reference Data

Platform	Size (px)	Format	Usage
Classic Desktop	16 × 16	.ico	Browser Tabs (legacy)
High DPI Desktop	32 × 32	.ico	Taskbar, Retina Tabs
Apple Touch	180 × 180	.png	iPhone / iPad Home Screen
Android Chrome	192 × 192	.png	Android Home Screen / PWA
Android Splash	512 × 512	.png	PWA Splash Screen

Frequently Asked Questions

Legacy support. While modern browsers support PNG favicons, tools like Internet Explorer 11 and certain enterprise software still strictly look for a favicon.ico file at the root. Providing a multi-resolution ICO ensures backward compatibility.

It is a JSON file that tells the browser how your web application should behave when "installed" on a mobile device or desktop. It defines the name, icons, and theme colors used by Android and Chrome OS.

No. All processing happens locally in your browser using the HTML5 Canvas API and Blob storage. Your images never leave your device.

Blurriness occurs when upscaling a low-resolution input. For best results, upload a source image of at least 512x512 pixels. Vector inputs (SVG) are ideal as they scale infinitely without loss.