Convert ICO to QOI
Convert ICO icons to QOI – a modern lossless format with fast compression and smaller file sizes than PNG.
ToFormat — free online converter
Upload your files
Max file size: 30MB · Up to 20 files at once
Why ToFormat?
Lossless Compression
QOI (Quite OK Image Format) compresses ICO without losing any quality. Perfect for archiving icons and game assets where every pixel matters.
Smaller than PNG
QOI often achieves better compression than PNG, especially for icons with large solid areas, while being much faster to encode and decode.
Batch & Multi‑Size Support
Upload up to 20 ICO files at once. Choose which size to convert from multi‑size ICOs. We'll package all QOIs in a ZIP.
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 QOI?
QOI (Quite OK Image Format) is a modern lossless image format created by Dominic Szablewski in 2021. It compresses RGB and RGBA images using a simple, fast algorithm that often outperforms PNG in both speed and file size. QOI is ideal for real-time applications, games, and situations where fast encoding/decoding is critical.
All QOI conversion tools →How to Convert
Upload your ICO
Click or drag and drop your ICO files. You can select up to 20 at once. If your ICO contains multiple sizes, choose which one to convert (usually the largest).
Choose QOI settings
QOI is lossless by default. Optionally enable RGBA if your ICO has transparency. That's it – no quality sliders needed.
Download QOI
Your QOI files are ready. Download individually or as ZIP. Files auto‑delete in 10 minutes.
When to Convert ICO to QOI
📱 Mobile Apps & Games
QOI's fast decompression makes it perfect for real‑time UI icons, game textures, and mobile applications where performance matters.
💡 Need PNG compatibility? Try ICO to PNG →💾 Storage Optimization
Archive your icon collection in QOI format. Save disk space with lossless compression that often beats PNG.
💡 For web: ICO to WebP →🚀 Real‑Time Rendering
Use QOI for UI textures in real‑time renderers – it's designed for speed, making it ideal for live applications.
💡 Also try ICO to TGA →🔄 Legacy to Modern
Have old ICO files? Convert them to QOI for a modern, space‑efficient archive that's easy to work with.
💡 Back to ICO: QOI to ICO →Format Comparison
| Format | ICO | QOI |
|---|---|---|
| Compression | Lossless | Lossless |
| Transparency | Yes | Yes |
| File Size | Larger | Larger |
QOI is a great lossless alternative to PNG. For web delivery, WebP offers lossy compression. Need to revert to ICO? Use our QOI to ICO converter.
💡 Pro Tips
- QOI is always lossless – there are no quality settings. Perfect when you need exact pixel reproduction.
- It is especially efficient for icons with solid colors and sharp edges, often compressing better than PNG while being 10‑20x faster.
- If your ICO contains an alpha channel, enable RGBA mode to preserve transparency. QOI handles alpha efficiently.
- If your ICO has multiple sizes, select the largest size (usually 256×256) for best quality, or convert all sizes separately.
- Convert in batch mode – upload multiple ICOs and download all QOIs as a ZIP archive. Great for icon sets.
- We strip metadata by default for privacy. ICO rarely contains EXIF, so any metadata is removed.
- QOI is supported in many modern tools and libraries. Check if your target software supports it before converting.
How ICO to QOI Conversion Works
ICO files often contain multiple images at different sizes and color depths. When converting to QOI, you typically extract a single image (usually the largest). Our server decodes the chosen ICO image to raw pixels, then encodes them using the QOI algorithm. QOI uses run‑length encoding and palette approximation to achieve excellent compression while preserving every pixel exactly. The result is often smaller than PNG and much faster to decode.
All processing is done in memory, and your files are permanently deleted after 10 minutes.
ICO vs QOI: Key Differences
Purpose: ICO is specifically for Windows icons; QOI is a general‑purpose lossless format.
Multi‑size: ICO stores multiple resolutions; QOI stores one image per file.
Compression: ICO may be uncompressed or use PNG; QOI offers modern lossless compression that often beats PNG.
Speed: QOI is designed for fast encoding/decoding, often 10‑20x faster than PNG.
Use cases: ICO for icons; QOI for games, apps, and real‑time graphics.
When to Convert ICO to QOI
Convert ICO to QOI when you need a modern, losslessly compressed format for applications where speed and file size matter. QOI is perfect for game UI assets, mobile app icons, and any scenario where you want PNG‑like quality with better performance and smaller files. Keep the original ICO for Windows compatibility, but for modern workflows QOI is an excellent choice.
Our QOI to ICO converter lets you go back to ICO when needed.