Convert ICO to Base64 Data URI Online - Free, Local & Instant
Convert ICO (image/x-icon) to Inline Base64 Data URI String (.txt) locally in your browser using HTML5 Canvas. Adjust compression quality, resize in pixels, and download instantly with zero server uploads.
Technical Comparison: ICO vs Base64 Data URI
Images & Game/Web Assets| Specification | ICO (Source) | Base64 Data URI (Target) |
|---|---|---|
| Format Name | Windows & Web Favicon Icon | Inline Base64 Data URI String |
| MIME Type | image/x-icon | text/plain |
| Transparency / Alpha | Yes (32-bit PNG frames) | Preserved for PNG, WEBP, AVIF, ICO, SVG, BMP |
| Compression Profile | Multi-resolution icon container | zero-HTTP-request inline data:image/...;base64 string for HTML, JSON, or JS bundles |
| Processing Engine | Native Browser Image Decoder | HTML5 Canvas + Client-Side Binary Encoder |
ICO to Base64 Data URI — Before & After Example
Input File: asset.ico MIME Type: image/x-icon Alpha: Yes (32-bit PNG frames) Compression: Multi-resolution icon container Decoding: Browser HTML5 Image + Canvas 2D Context
data:image/webp;base64,UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoQAAoAAUAmJaQAA3AA/vuUAAA=
Frequently Asked Questions: ICO to Base64 Data URI
Does converting ICO to Base64 Data URI upload my images to a remote server? ▾
Never. Every ICO file you select is decoded directly in your browser using the HTML5 Canvas API and FileReader API. Your images stay in your computer or phone RAM at all times.
Can I resize and adjust compression quality when converting ICO to Base64 Data URI? ▾
Yes. Use the Quality slider (10%–100%) and the Width/Height pixel inputs above the drop zone. Keeping "Lock Ratio" checked preserves your original aspect ratio automatically.
Does this converter support batch ICO to Base64 Data URI conversion with ZIP download? ▾
Yes. Drag and drop multiple ICO files at once; you can download each converted Base64 Data URI individually or click "Download All (.ZIP)" to bundle them locally via JSZip.
Why use Base64 Data URI instead of ICO? ▾
Converting ICO to Base64 Data URI gives you zero-HTTP-request inline data:image/...;base64 string for HTML, JSON, or JS bundles while keeping full control over pixel dimensions and byte size.