Icon Pack Builder

Icon Pack Builder is a Windows application that generates multiplatform icon packs from one or multiple source images. The software processes assets locally to produce Windows .ico files, Android density folders, Apple-specific icon sizes, and web favicons with a deterministic folder structure and no internet connection required.

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• Windows .ico file generation. This function takes single or multiple input images and produces .ico files containing multiple embedded resolutions. The operating system selects the appropriate resolution based on the display context, maintaining compatibility with legacy systems and modern high-density pixel displays.
• Android density folder creation. The software automatically generates the `res/mipmap-*` folder structure with standardized Android ecosystem densities (mdpi, hdpi, xhdpi, xxhdpi, xxxhdpi). Each folder receives the resized icon with exact dimensions required by the operating system for launchers, action bars, and notifications.
• Apple and macOS icon size export. The application produces the complete icon sets required for Apple platforms, including iOS, iPadOS, and macOS formats. This covers App Store icons and system interface icons following Apple's dimension specifications for each context.
• Batch processing of multiple images. Icon Pack Builder accepts multiple source images in a single operation. The system processes each file individually and generates its corresponding icon pack, allowing complete asset collections to be transformed without manual intervention on each file.
• Web favicon generation. The program creates the complete favicon set required for modern browser and platform compatibility. This includes standard .ico formats for desktop browsers and platform-specific PNG files for mobile devices and high-resolution displays when saving websites to home screens.
• Deterministic folder structure. Each program execution produces identical folder and file organization for the same input images. Output file names and directory hierarchy follow fixed, predictable patterns, facilitating workflow automation and build system integration.
• Offline operation without internet. All image processing, resizing, and packaging occurs on the local machine without sending data to external servers. Images remain on the user's system with no registration, user account, or subscription required to access the program's complete functionality.
• Interpolation algorithm resizing. The application uses interpolation algorithms to adjust images to target dimensions. This mathematical process calculates new pixel values based on surrounding pixel values from the original image, preserving visual quality across generated sizes.
• Image transparency handling. Icon Pack Builder preserves alpha channels from source images during resizing and format conversion processes. Resulting icons maintain original transparency information, which is necessary for proper icon integration over different background colors in operating systems.
• Common image format compatibility. The program accepts standard image formats including PNG, JPEG, BMP, and GIF as input for icon pack generation. This flexibility allows developers to work with existing assets without requiring pre-conversion to specific formats.

Icon Pack Builder development started in 2025, created by an individual developer under the BassThermal alias. The application is written in the C# programming language and is available exclusively for Windows through the Microsoft Store.

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