📖 Description

ICO is a specialized icon format for Windows systems and browser environments, possessing irreplaceable characteristics:

Website Identity: The Favicon (favicon.ico) is the "business card" of a website, displayed in browser tabs, favorites bars, and bookmarks, enhancing brand professionalism.
Multi-size Packaging: A single ICO file can contain multiple bitmaps of sizes like 16x16, 32x32, 48x48, etc. The system automatically selects the most appropriate pixel size based on the display environment, preventing blurriness.
System Compatibility: Windows applications and desktop shortcuts require the ICO format to display transparency and multi-level scaling correctly.

This site's tool provides a professional-grade icon conversion solution through intelligent resampling algorithms:

Broad Support: Compatible with source files like $PNG, JPG, WebP, GIF, BMP$, preserving $PNG$'s alpha channel.
High-Definition Reconstruction: Optimizes pixel edges during scaling, ensuring icons remain clear and recognizable even when reduced to $16 \times 16$ pixels.

Standard Presets: Automatically provides the standard $32 \times 32$ pixel format required for websites.
Multi-size Synthesis: Supports packaging multiple resolutions (e.g., $16 \times 16, 32 \times 32, 48 \times 48, 64 \times 64$) into a single ICO file, meeting the adaptive needs of Retina and standard screens.

Auto-Centering: For non-square original images, the tool supports automatic center cropping or adding transparent borders to prevent icon stretching or distortion.
Shape Conversion: Supports converting square images into rounded-corner or circular icons with one click.

End-to-End Processing: All conversion operations are completed locally in the browser; images are not uploaded to any server. Your design drafts and private icons will never be leaked.

Size (px)	Application Scenario	Recommendation
16 x 16	Browser address bar, tab pages.	Lines should be minimal; avoid complex details.
32 x 32	Browser favorites bar, Windows standard desktop icons.	The most commonly used standard Favicon size.
48 x 48	Windows File Explorer large icon preview.	Recommended to include in multi-size ICO packages.
128 x 128+	Software installation packages, high-resolution desktop display.	Requires higher quality source images.

Upload Image: Drag and drop or select a square (optimal) $PNG$ or $JPG$ image.
Select Sizes: Check the sizes you need (single or multiple for packaging).
Configure Options: Choose whether to preserve transparency or apply rounded corners.
Start Conversion: Click "Generate ICO," and encoding completes in milliseconds.
Download & Deploy: Download favicon.ico and place it in your website's root directory, or use it to replace software icons.

Supports Transparency: Perfectly preserves the semi-transparent (Alpha channel) effects of original $PNG$ files, resulting in icons without white borders.
Ultra-Fast & No Login Required: No complicated steps; open and use immediately. The conversion process happens without page refresh.
Watermark-Free Output: Generated icons are clean and pure, with no extra pixels added.
Completely Free: Permanently free for developers and design enthusiasts, with unlimited conversions.

ICO Converter