Convert any brand logo, graphic, or photo into authentic, production-grade Windows Icon (.ico) binary files and complete multi-platform modern web favicon bundles directly inside your browser.
Unlike basic online converters that output simple single-layer bitmaps or upload your proprietary artwork to cloud servers, RiazHub’s Universal Image to ICO Studio is powered entirely by native client-side JavaScript (DataView, ArrayBuffer, and HTML5 Canvas). It compiles valid Windows Icon structures containing the official 6-byte ICONDIR header and 16-byte ICONDIRENTRY descriptors, allowing you to embed 16×16, 24×24, 32×32, 48×48, 64×64, 128×128, and 256×256 sub-images into a single .ico binary with true 32-bit RGBA alpha transparency.
The studio features progressive halving downsampling with micro-acutance Laplacian convolution sharpening to prevent blurry 16px tab icons, 1:1 aspect ratio fitting (pad to square, center crop, stretch), realistic simulated Chrome and Safari browser tab stages in both Light and Dark themes, syntax-highlighted HTML <head> code, and a zero-dependency in-memory PKZIP packager that bundles your favicon.ico, individual PNG favicons, apple-touch-icon.png (180×180), android-chrome-192×192.png, android-chrome-512×512.png, mstile-150×150.png, site.webmanifest, and browserconfig.xml in one click.
Universal Image to ICO & Favicon Studio
Convert logos and artwork into authentic multi-layer Windows .ico files (16px through 256px), generate full multi-platform favicon packs for iOS & Android PWAs, and test in real-time browser tab mockups.
<head>...</head> section of your website or WordPress header template, and upload the extracted favicon assets to your website's root directory.
.ico file is a container format that embeds multiple sub-images at resolutions such as 16×16, 32×32, 48×48, and 256×256. When an operating system or web browser displays your icon in different contexts—such as a 16px browser tab, a 32px taskbar shortcut, or a 256px high-DPI desktop view—it dynamically selects the exact sub-image layer rather than awkwardly interpolating a single resolution, preserving crisp vector-like sharpness.
ICONDIR header (specifying the icon type 0x0001 and the image count $N$). It is immediately followed by an array of 16-byte ICONDIRENTRY blocks for each embedded resolution. Each entry details the width, height, color count, color planes, bit count (32-bit for true RGBA), the exact size of the byte payload, and the byte offset pointing to where the image data starts in the file.
.ico files when users save your site to their home screen; iOS requires an explicit apple-touch-icon.png rendered at 180×180px. Similarly, Android devices and Chrome PWAs demand 192×192px and 512×512px icons declared inside a site.webmanifest file. Our 1-click ZIP export bundles all of these assets alongside Windows 10/11 mstile-150x150.png and browserconfig.xml.