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📄 ICO Generator

ICO File Generator

Create a standards-compliant .ico file containing 10 icon sizes from any PNG or JPG image. Free, instant, and 100% private — no server upload.

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What is an ICO file?

An .ico file is the Windows/browser icon format that bundles multiple image sizes into one file. When you add favicon.ico to a web project, browsers automatically choose the most appropriate size — 16px for tabs, 32px for HiDPI tabs, 256px or 512px for Windows/macOS icon caches.

Why use a multi-size ICO?

A single 16×16 favicon blurs on retina/HiDPI screens. A single 512×512 wastes bandwidth in tab bars. The ICO format solves this by packing all sizes in one file — browsers and operating systems pick the right one automatically. Our generator creates 10 sizes: 16, 24, 32, 48, 64, 72, 96, 128, 256, and 512 pixels.

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Frequently Asked Questions

ICO (Icon) is a Microsoft-developed file format that stores one or more images at multiple resolutions in a single file container. It is the standard favicon format for websites and the icon format for Windows applications.
A comprehensive ICO for web use should contain: 16×16, 32×32, 48×48, 64×64, 128×128, and 256×256. The browser picks the most appropriate size for the display context automatically.
Yes. JPG, PNG, WEBP, BMP, and GIF inputs are all supported. The generator converts the input to the required sizes internally. PNG with transparency is recommended for best results.
Favicons must be readable at 16×16 pixels. Avoid complex illustrations — use a single bold letter, simple monogram, or clean logo mark. High contrast between the icon and white/dark backgrounds is essential.
Yes. Completely free, no watermarks, no account required. All processing runs in your browser — no server, no upload.
The ICO stores PNG-encoded frames which include sRGB colour profile by default. This ensures consistent colour rendering across Windows, macOS, and browsers.

ICO vs PNG vs SVG favicon comparison

FormatBrowser SupportTransparencyScales
ICOUniversal (all browsers)✅ YesMulti-res
PNGAll except IE✅ YesFixed size
SVGChrome, Firefox, Edge✅ Yes∞ Perfect

ICO Generator – Create Multi-Size Icon Files for Web and Desktop

ICO files are multi-image containers — a single .ico file can hold multiple sizes of the same icon (16×16, 32×32, 48×48, 64×64, 128×128, 256×256) and the operating system or browser selects the appropriate size based on context. This is why a single favicon.ico looks crisp in both the tiny browser tab and when pinned to the Windows taskbar at a larger size.

This tool accepts any image — PNG, JPG, WEBP, or SVG — and generates a proper multi-size ICO file ready for use as a browser favicon, Windows application icon, or desktop shortcut icon. For best results, upload a square PNG with transparent background at 512×512px or larger. All resizing and ICO format encoding happens in your browser — your image is never uploaded to a server.

  • Browser favicons — Place favicon.ico in your website root; browsers automatically detect it
  • Windows app icons — ICO is the native Windows icon format for .exe applications and shortcuts
  • Transparency — Use PNG with transparent background as input to get transparent ICO output

Related Tools

🌐 Favicon Generator 🔷 JPG to ICO 🔷 PNG to ICO