For a modern website, you should default to .png favicons for most sizes and keep a single .ico only for legacy browser support. The exception is if you need maximum compatibility with older browsers or Windows desktop shortcuts — then a .ico is still required. In practice, you'll likely use both, and Favicon Generator creates the full set from one image.
When to use .ico
.ico is the original Windows favicon format, and it's the only format that Internet Explorer and older Edge versions recognize. Even in 2026, some corporate environments and legacy browsers still expect a favicon.ico file in the site root, so it's a safe fallback. .ico files can contain multiple sizes in a single file (16x16, 32x32, 48x48), which is handy for Windows desktop shortcuts and browser tabs. However, .ico has larger file sizes compared to .png and doesn't support transparency as cleanly in all contexts.
Use .ico when:
- You need to support Internet Explorer or very old browsers.
- You want a single file for Windows desktop shortcuts.
- You're building a site for a conservative industry (finance, government) where legacy support matters.
When to use .png
.png is the modern standard for favicons. All current browsers — Chrome, Firefox, Safari, Edge — support .png favicons with transparency and better compression. You can serve different sizes (16, 32, 48, 192, 512) for high-DPI displays, and .png files are usually smaller than equivalent .ico files. For most personal sites, blogs, and modern web apps, a .png alone is sufficient.
Use .png when:
- You're targeting modern browsers only.
- You want crisp icons on retina displays.
- You want smaller file sizes and simpler asset management.
Why local conversion beats upload-based sites
Most online favicon generators make you upload your image to their server, then download a zip. That means your file travels across the internet, where it could be stored or misused. Alvseike's tools run entirely in your browser — nothing is uploaded, so your image never leaves your device. This is faster, more private, and there are no file-size caps. You can convert as many images as you like, subject to the daily free allowance (5 exports without an account, 15 with a free account), and upgrade to Pro for unlimited use.
Common mistakes to avoid
- Relying solely on .ico: You miss out on modern PNG benefits like transparency and smaller file size.
- Forgetting the 16x16 size: Some browsers still request it, and a missing 16x16 can cause a 404.
- Using a large PNG as a favicon: It's fine, but you should also provide a 32x32 for high-DPI screens.
- Not testing in multiple browsers: What works in Chrome may not work in Safari, so check your favicon in at least two browsers.
- Ignoring the apple-touch-icon: For iOS home screen icons, you need a 180x180 PNG, not an .ico.
Making the choice
If you're starting fresh, generate a full set: one favicon.ico (with 16 and 32 sizes) and a set of PNGs (16, 32, 48, 192, 512). Use the PNG for modern browsers and the .ico as a fallback. The Favicon Generator produces all of these from a single image, along with the HTML snippet to include in your <head>. That way you cover every browser and device without manual work.
Deep dive: technical differences
Beyond the obvious, .ico and .png differ in how they encode images. .ico is a container format that can hold multiple bitmaps, each with its own size and color depth. This is why a single .ico can serve as both a 16x16 and a 32x32 favicon. .png, on the other hand, is a single-image format with a fixed size. To provide multiple sizes, you need separate files, which is why a favicon set includes several PNGs.
Color depth is another difference. .ico files traditionally support 8-bit (256 colors) and 24-bit (true color) bitmaps, but transparency is limited to a 1-bit mask in many cases. .png supports 24-bit color with an 8-bit alpha channel, giving you smooth, semi-transparent edges. This makes .png superior for icons with rounded corners or shadows.
Compression also differs. .ico uses a simple run-length encoding or stores uncompressed data, leading to larger files. .png uses lossless DEFLATE compression, which is more efficient for flat-color graphics like icons. A 32x32 .png can be half the size of an equivalent .ico, which matters for page load speed.
Practical implications for your site
When you include both formats, you need to reference them correctly. The classic approach is to place a favicon.ico in the root directory and let the browser request it automatically. For .png, you add a link tag in your HTML, like <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">. Modern browsers will pick the most appropriate size from the available PNGs.
If you're using a content management system like WordPress, you can often upload a single image and the system generates the necessary sizes. But for a hand-coded site, you'll manually add the link tags. The Favicon Generator gives you the exact snippet, so you don't have to remember the syntax.
Another practical point: favicon caching can be aggressive. If you update your favicon, visitors may still see the old one for days. To force a refresh, you can change the file name or add a query string like ?v=2. This is a common trick to avoid stale icons.
Accessibility and user experience
Favicons are more than a cosmetic detail. They help users identify your site among many open tabs, especially on mobile browsers where tabs are small. A clear, distinctive favicon improves navigation and brand recall. Using .png ensures your icon looks sharp on high-DPI screens, which is essential for a professional appearance.
For users with visual impairments, favicons aren't directly accessible, but they contribute to a consistent interface. Some browsers use the favicon in bookmarks and history, so a good icon helps users find your site later. A mismatched or missing favicon can make your site look unfinished.
Performance considerations
Every file on your page adds to the total page weight. While a favicon is small, it's still a request. Using a .png that is optimized can reduce the size by a few kilobytes, which is negligible for most sites but matters for extremely fast load times. Since .ico files are often larger, switching to .png can save a little bandwidth.
If you're serving multiple sizes, you might think you're adding many requests. But browsers typically only download the size they need. For example, a desktop browser will fetch the 32x32, while a mobile device might fetch the 192x192. So the total download is usually just one or two files.
Future trends
As of 2026, .png is the de facto standard, and .ico is fading. Some browsers have even dropped support for .ico in certain contexts, though it's still recognized for legacy compatibility. Newer formats like .webp or .svg could become alternatives, but .png remains widely supported and recommended. For now, the safest bet is to use .png for all modern use cases and keep .ico only for legacy needs.
The Favicon Generator is updated to reflect current best practices, so you can trust its output. It produces the exact files and code you need, without any guesswork. Since it runs locally, you can experiment with different images without worrying about privacy or upload limits.
In summary, choose .png for its superior compression, transparency, and modern support. Keep a .ico as a fallback for the few cases that still require it. With the Favicon Generator, you can generate both in seconds and ensure your site looks professional on every device.