Analyze ICO favicon files with detailed icon information, size breakdowns, hex viewer, and file structure analysis. Free, fast, and secure browser-based viewer.
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View all embedded icon sizes with individual previews and detailed specifications
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Analyze ICO file format structure, headers, and directory entries
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ICO files are Windows icon format files that can contain multiple images at different sizes and color depths:
An ICO file is a Windows icon format that can contain multiple images at different sizes and color depths in a single file. It's commonly used for website favicons, Windows application icons, and desktop shortcuts. Unlike single-image formats, ICO files allow systems to choose the most appropriate size for display.
ICO files commonly contain sizes like 16×16, 24×24, 32×32, 48×48, 64×64, 128×128, and 256×256 pixels. Modern ICO files for Windows can include PNG-compressed images up to 256×256. For web favicons, 16×16 and 32×32 are the most important sizes.
ICO files support various color depths including 1-bit (monochrome), 4-bit (16 colors), 8-bit (256 colors), 24-bit (16.7 million colors), and 32-bit (24-bit color + 8-bit alpha transparency). Modern icons typically use 32-bit for smooth transparency effects.
Yes, your files are completely secure. All file processing happens locally in your browser using JavaScript. Your ICO files are never uploaded to any server, ensuring complete privacy for your icon files and their contents.
Yes! Use the "Extract Icons" button to download individual icon sizes as PNG files. This is useful when you need specific sizes from a multi-image ICO file, or want to convert icons for use on different platforms.
The Hex viewer displays the raw binary content of your ICO file in hexadecimal format alongside its ASCII representation. This is useful for understanding the file format structure, debugging issues, or verifying file integrity.