Favicon & ICO Converter
Convert single images into Windows-standard `.ico` icons bundling multiple resolutions offline.
| File Name | Dimensions | Size | Status | Actions |
|---|---|---|---|---|
| No converted files in queue. Upload an image and click Generate. | ||||
User Guide: Client-Side Favicon & ICO Conversions
What makes this converter unique?
Most converters require sending files to remote servers, which limits file sizes and poses a privacy risk. Our utility operates entirely inside your browser thread. By combining high-speed native canvas elements with WebAssembly modules, your original files are converted locally on your machine.
How "Multi-Size" ICO files work
When you select multiple dimensions (e.g. 16x16, 32x32, 48x48) and generate your favicons, the tool builds both individual single-resolution ICOs and a combined Multi-Size ICO. The Multi-Size ICO packs all your selected sizes inside a single file wrapper. When a browser loads it, it automatically extracts the resolution that best fits the screen DPI or address box.
Decoders and WebAssembly Features
- HEIC / HEIF support: Decodes Apple iPhone formats client-side using standard WebAssembly.
- ICO Format Compile: Natively writes multi-size favicon byte records completely inside your browser.
- Offline Compatible: After initial page load, this tool can run fully disconnected without internet.