Convert PNG to ICO
Convert PNG to ICO online for free. Create browser favicons and Windows icons from any PNG. No upload — runs entirely in your browser.
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About Convert PNG to ICO Conversion
ICO (Icon) format is the standard for Windows application icons and browser favicons. Every website needs a favicon — the small icon that appears in browser tabs, bookmarks, and address bars. Converting a PNG logo or graphic to ICO format is the first step in creating a professional favicon set for your website.
The ICO format is a container that can hold multiple sizes of the same icon in one file. Browser favicons are typically requested at 16×16, 32×32, and 48×48 pixels. Windows application icons may include even larger sizes: 64×64, 128×128, and 256×256. OptiPic generates an ICO file that works as a browser favicon.
For the best results, start with a PNG that is at least 256×256 pixels. OptiPic will scale it down to the appropriate favicon sizes. Simple, bold graphics with clear shapes work best at small sizes — complex logos with thin lines or small text become unreadable at 16×16 pixels. Consider simplifying or creating a symbol version of your logo specifically for small-size favicon use.
To use your ICO favicon on a website, place the favicon.ico file at the root of your website domain (https://yourdomain.com/favicon.ico) and add a link rel="icon" tag in your HTML head. Modern browsers will also use link rel="icon" type="image/png" tags to request PNG favicons at specific sizes — OptiPic's Favicon Generator tool produces a complete favicon package including all PNG sizes.
After converting your PNG to ICO, you have a favicon that works in all browsers and as a Windows desktop or taskbar icon for applications.
Frequently Asked Questions
- What size PNG should I use to create an ICO favicon?
- Use a PNG that is at least 256×256 pixels. Larger source images give OptiPic more pixel data to work with when scaling down to 16×16, 32×32, and 48×48 favicon sizes, resulting in better quality small icons.
- Can I use a PNG for my favicon instead of ICO?
- Yes, modern browsers support PNG favicons directly. However, ICO remains the most broadly compatible format, especially for browsers that request `favicon.ico` from the root of your domain automatically. For full compatibility, serve both an ICO file and PNG favicon links in your HTML head.
- Does the ICO contain multiple sizes?
- Yes. ICO is a container format that can hold multiple icon sizes. OptiPic includes the standard sizes needed for browser favicons. For a full favicon package with Apple Touch Icons and web app manifest icons, use the Favicon Generator tool.
- Will transparency in my PNG be preserved in the ICO?
- Yes. Modern ICO format supports PNG data inside the container, which includes full alpha channel transparency. Your transparent PNG logo will produce a transparent ICO that works correctly as a favicon.