Convert ICO to AVIF
Convert your ICO icons to next-gen AVIF format. Smaller files, superior quality, and full transparency support for modern web and apps.
ToFormat — free online converter
Upload your files
Max file size: 30MB · Up to 20 files at once
Why ToFormat?
Superior Compression
AVIF shrinks ICO files dramatically – up to 50% smaller than WebP at equivalent quality. Perfect for websites and storage.
Transparency Preserved
ICO icons often include alpha transparency. AVIF supports full 8/10/12‑bit alpha, so your icons keep their transparent backgrounds flawlessly.
Batch Conversion
Upload up to 20 ICO files at once. We'll convert each to AVIF and package in a ZIP for easy download.
About the Formats
🖍️ What is ICO?
ICO (Icon) is the native icon format for Windows. It can contain multiple images of different sizes and color depths (including 1‑bit, 4‑bit, 8‑bit, 24‑bit, 32‑bit with alpha). ICO files are used for program icons, favicons, and file type associations.
All ICO conversion tools →🚀 What is AVIF?
AVIF (AV1 Image File Format) is a next‑generation image format based on the AV1 video codec. It offers exceptional lossy and lossless compression, supports HDR, wide color gamut, and alpha transparency. AVIF files are typically 50% smaller than JPEG at the same quality and are supported by all major browsers (Chrome, Firefox, Safari, Edge).
All AVIF conversion tools →How to Convert
Upload your ICO file
Click or drag and drop your ICO files. You can select up to 20 at once.
Choose AVIF settings & size
Select quality (lossy/lossless) and, if your ICO contains multiple sizes, pick which one to convert (usually the largest). Enable alpha if present.
Download AVIF
Your AVIF files are ready. Download individually or as ZIP. Files auto‑delete in 10 minutes.
When to Convert ICO to AVIF
🌐 Website Icons
Convert your favicon or UI icons to AVIF for cutting‑edge websites. Dramatically smaller files, faster page loads.
💡 Need PNG fallback? Try ICO to PNG →📱 Mobile Apps
Use AVIF icons in Android and iOS apps for better performance and smaller app bundles.
💡 For WebP compatibility: ICO to WebP →💾 Storage Optimization
Archive your icon collection in AVIF. Save up to 50% space while keeping transparency and quality.
💡 Lossless alternative: ICO to BMP →🔄 Legacy to Modern
Have old ICO files? Convert them to AVIF for future‑proof archival and modern use.
💡 Back to ICO: AVIF to ICO →Format Comparison
| Format | ICO | AVIF |
|---|---|---|
| Compression | Lossless | Lossy |
| Transparency | Yes | Yes |
| File Size | Larger | Smaller |
AVIF is the most advanced format for web and apps. For maximum compatibility, provide fallbacks like WebP or PNG. Need to revert to ICO? Use our AVIF to ICO converter.
💡 Pro Tips
- Use lossy AVIF for photos in icons – quality 80‑90% gives excellent results with minimal size.
- For icons with sharp edges and transparency, lossless AVIF preserves every pixel while compressing better than PNG.
- If your ICO contains multiple sizes, select the largest size (usually 256×256) for best quality, or convert all sizes separately.
- AVIF supports HDR and wide color gamut – if your icon uses those, enable HDR mode.
- Convert in batch mode – upload multiple ICOs and download all AVIFs as a ZIP archive. Great for icon sets.
- We strip metadata by default for privacy. ICO rarely contains EXIF, but any present is removed.
- AVIF does not support animation (unlike AVIF sequences). For animated icons, consider other formats.
How ICO to AVIF Conversion Works
ICO files often contain multiple images at different sizes. When converting to AVIF, you typically extract a single image (usually the largest). Our server decodes the chosen ICO image to raw pixels, then encodes it as AVIF with your selected quality settings. AVIF uses the AV1 codec to achieve outstanding compression while preserving detail and transparency.
All processing is done in memory, and files are permanently deleted after 10 minutes.
ICO vs AVIF: Key Differences
Purpose: ICO is for Windows icons; AVIF is a modern web/universal format.
Multi-size: ICO stores multiple resolutions; AVIF stores one image per file (but can be tiled).
Compression: ICO can be uncompressed or use PNG; AVIF offers superior lossy/lossless compression (50% smaller).
Transparency: Both support alpha – ICO via 32‑bit, AVIF via full alpha channel.
Use cases: ICO for Windows shortcuts/favicons; AVIF for websites, apps, and storage.
When to Convert ICO to AVIF
Convert ICO to AVIF when you need a modern, space‑efficient format for web or app development. AVIF files are significantly smaller, load faster, and are supported by all modern browsers. Keep the original ICO for legacy Windows compatibility (e.g., favicon.ico for older browsers).
Our AVIF to ICO converter lets you go back when needed.