ICO Converter

ブラウザ内で安全にICO Converterを実行。サーバーへのアップロード不要、登録不要、完全無料。

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1. Upload Image

Square PNG with transparent background works best

Choose Image

Upload an image to build a real multi-resolution .ico file — 16, 32, 48, 64, 128, 256px in one file

ICO Converter

DCPIXELのブラウザ内高速処理技術により、ファイルは端末の外に出ることなく安全に処理されます。

🔐 100% Private — Client-Side Execution

All processing happens inside your browser using WebAssembly and HTML5 Canvas. Zero file uploads, zero server tracking. Compliant with LGPD & GDPR.

よくある質問 (FAQ)

Why not just rename a PNG to .ico?

A renamed PNG is not a valid .ico file — Windows and many apps expect the real ICO container format with multiple embedded resolutions, which is exactly what this tool builds.

Which sizes are included?

16, 32, 48, 64, 128, and 256 pixels, all packed into a single .ico file so the right size is used automatically wherever it's needed.

What is the best source image to use?

A square image, ideally 256×256px or larger, with a transparent background for the cleanest result at every size.

🔥 Speed Up Your Site - 60% Off Launch

Score 99+ on Google PageSpeed Insights

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ICO Converter

1. Upload Image

ICO Converter

よくある質問 (FAQ)

Score 99+ on Google PageSpeed Insights

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