ICO to AVIF Crop Converter
Load an ICO file, drag the crop handles to define exactly the area you need, preview the result, then download a compact AVIF. Everything runs in your browser — your image never leaves your device.
Drop an ICO here
or Browse Files · ICO supported
What This Tool Does
This tool loads an ICO image directly in your browser, presents an interactive crop overlay with draggable handles, and converts the selected area to an AVIF file. No server upload is required. The full workflow — loading, cropping, and AVIF encoding — runs entirely in client-side JavaScript using the HTML5 Canvas API. ICO files are decoded by drawing them to an offscreen canvas, ensuring complete pixel data is available before the crop overlay is drawn. The output is an AVIF file encoded using the browser's native canvas.toBlob('image/avif') API, delivering modern compression with full alpha channel support.
Who This Is For
- Web developers who need to deliver a specific region of an ICO as a compact AVIF for modern web pages
- Designers converting icon assets to AVIF for next-generation web performance requirements
- Anyone who needs to extract and convert a portion of an ICO to AVIF without installing dedicated software
- Content creators who want a quick, privacy-respecting crop-and-convert tool that needs no account or upload
ICO vs AVIF: Format Comparison
| Property | ICO | AVIF |
|---|---|---|
| Compression | Lossless (PNG) or uncompressed (BMP) | Lossy or lossless (AV1-based) |
| Color depth | Up to 32-bit (RGBA) | Up to 12-bit per channel (HDR capable) |
| File size | Small for icon sizes | Very small — best-in-class compression |
| Animation support | None | Supported (AVIS) |
| Transparency support | Full alpha channel | Full alpha channel |
| Web support | Limited (favicon use only) | Chrome, Edge, Firefox, Safari (modern) |
| Best for | Windows icons and favicons | Modern web images, high-quality thumbnails |
Frequently Asked Questions
AVIF (AV1 Image File Format) is a modern, highly efficient image format offering superior compression compared to PNG, JPEG, and WebP. ICO files are Windows icon containers. Converting a cropped ICO region to AVIF produces a compact, high-quality file ideal for modern web use where bandwidth efficiency matters.
Yes — the tool provides an interactive crop overlay on the source image. Drag the corner and edge handles to define exactly which portion of the ICO you want in the output AVIF. Click Preview Crop to see the result before downloading.
No. All processing — loading, cropping, and AVIF encoding — happens entirely in your browser using JavaScript and the HTML5 Canvas API. Your image never leaves your device.
AVIF encoding via the Canvas API is supported in Chrome, Edge, and Opera. Firefox and Safari may fall back to WebP or PNG output. The tool detects browser support and uses the best available format automatically.
The tool is limited by your browser's available memory. ICO files are typically small (16×16 to 256×256 px), so processing is fast on all modern browsers.
Click the Start Over button that appears after loading an image. This clears the current file and resets the crop area so you can load a new ICO.