ICO Converter
Free online ICO image converter. Convert ICO files to JPG, PNG, WebP, AVIF and more. 100% browser-based, no upload required.
Convert to:
Drop your image here
or click to browse — ICO, JPG, PNG, WebP, AVIF, TIFF, BMP, GIF and more
Your files never leave your device. All conversion happens 100% locally in your browser.
What Is an ICO File?
ICO is a file format used to store icons for applications, websites, and operating system elements on Windows and web browsers. An ICO file is a container that can hold multiple versions of an image at different resolutions and color depths simultaneously. Common icon sizes stored in a single ICO file include 16x16, 32x32, 48x48, 128x128, and 256x256 pixels. The operating system or browser then selects the most appropriate size for the context in which the icon is displayed.
ICO files are most commonly used as website favicons (the small icon visible in browser tabs and bookmarks) and as application icons in Windows. Creating a favicon involves converting an existing PNG or JPG logo into an ICO file. Our free ICO converter handles both directions: converting ICO files to common formats like PNG and JPG, and converting images from any format into properly structured ICO files for use as favicons.
ICO Conversion Use Cases
PNG to ICO: Create a Website Favicon
The most common ICO use case is creating a favicon from a logo or brand image. Upload your PNG logo (ideally square), select ICO as the output format, and download the resulting .ico file. Add it to your web root and reference it in your HTML with a link tag for it to appear in browser tabs.
ICO to PNG: Extract Icon Images
Convert ICO to PNG to extract the image contained in an icon file for use in designs, documentation, or other digital projects. PNG is the most versatile output format since it preserves transparency and is supported by all design tools and web browsers.
ICO to JPG: For Sharing and Compatibility
Convert ICO to JPG when you need to share an icon image in a universally compatible format. JPG is supported everywhere but loses the transparency information that ICO and PNG support. Use this conversion for thumbnails, previews, or platforms that only accept JPG.
How to Create a Favicon from a PNG in 3 Steps
- Select ICO as your output format. Click the ICO button in the format selector above the drop zone.
- Drop your PNG logo. Drag your square logo image into the drop zone or click to browse. For best results, use a PNG that is at least 256x256 pixels.
- Download and deploy your favicon. Click the download button to save your .ico file, then upload it to your website root and reference it in your HTML head section.
All ICO creation and conversion runs entirely in your browser using pure JavaScript. No files are uploaded. Your images remain on your device throughout the entire process.
Frequently Asked Questions About ICO Files
What size should a favicon ICO be?
The minimum favicon size is 16x16 pixels. Modern browsers also use 32x32 and 48x48. For best results across all devices, provide a 256x256 source image. Our converter automatically scales the image to the appropriate ICO dimensions.
Does ICO support transparency?
Yes. ICO files support alpha transparency when they contain PNG-encoded image data internally (which is standard for modern ICO files at 256x256). Older ICO formats use a 1-bit mask for transparency instead of a full alpha channel.
Are my ICO files uploaded to a server?
No. All ICO conversion and generation runs entirely in your browser using JavaScript. Your files never leave your device, are never stored on any server, and are never shared with anyone.