100% Free No Upload Bulk Conversion

Bulk HDR to ICO Converter — Free, Unlimited

Convert multiple HDR files to ICO instantly — all in your browser. No file limits, no watermarks, and completely private.

HDR ICO  ·  ZIP
Bulk HDR → ICO Converter
Select files, convert, download ZIP — all locally
HDR Support is coming soon — we are working on it.

Drop HDR files here or click to browse

Supports batch selection — convert hundreds of files

HDR → ICO ZIP
0 files
Converting 0 / 0
✓ Conversion completed! All files converted successfully. Click Download ZIP to save them.

Why convert HDR to ICO?

If you work with HDR regularly, you've probably hit compatibility walls. ICO was built for exactly this gap – Website favicons and app icons. This conversion processes your files entirely in your browser using WebAssembly – no upload, no server, no privacy concerns. Perfect for sensitive or large batches. Once you see the size or compatibility difference, going back rarely makes sense.

Technical comparison: HDR vs ICO

PropertyHDRICO
Full nameHigh Dynamic Range ImageIcon Image Format
Compression Lossless Lossless
Color depth32-bit float32-bit
Transparency No Yes
Web support No Yes
Developed byRadiance / Greg Ward (1989)Microsoft (1985)
Max colorsfloating point16.7M
MIME typeimage/vnd.radianceimage/x-icon
Category Raster image Raster image
Year gap 4 years apart in technical development
Best for High dynamic range photography Website favicons and app icons
Estimated size change Typically 10%-20% smaller

How to use — 3 simple steps

1
Select your HDR files
Drag & drop or click to choose multiple HDR images. No file size restrictions.
2
Start the conversion
Click "Convert to :to" — your files are processed locally using WebAssembly. No upload, no waiting.
3
Download ZIP archive
All converted ICO files are bundled into a single ZIP. One click, everything saved.

Popular use cases for HDR → ICO

Marketing teams standardizing campaign assets from HDR to ICO

Converting HDR product photography to ICO for a faster-loading storefront

Bloggers converting HDR images to ICO before uploading to a CMS

Newsletter designers converting HDR graphics to ICO for smaller email sizes

💡 Pro tips

  • Use the ZIP download to get all converted files in a single click
  • All processing is private — files are never uploaded to any server

Frequently Asked Questions

Most operating systems and browsers open ICO natively; no extra software should be required for typical use.
Each conversion from the same original HDR file produces the same result — quality doesn't degrade further as long as you always start from the original.
Website favicons and app icons is the most common reason people choose ICO over HDR.
The practical limit is your device's available memory rather than a fixed number set by the tool.
Application offline!