How to Convert HDR to ICO

ICO is the format Windows uses specifically for icons — application icons, file type icons, and website favicons — and a single ICO file can bundle multiple sizes of the same image (commonly 16×16 up to 256×256 pixels) so the operating system can pick the right resolution depending on context. HDR is rarely the source for icon design, since it's built for lighting and rendering work rather than graphics, but the conversion process still works: tone-mapping the extended range data down and packaging it into the ICO container Windows expects.

This is mainly useful in unusual situations, such as creating a thumbnail-style icon representing a specific HDRI map or lighting project file, rather than a typical icon design workflow.

1. Install Turbo Batch Image Converter Pro on your Windows PC.
2. Open the app and select Batch Mode for multiple files, or Individual Mode for a single HDR.
3. Drag your HDR file or folder into the app window, enabling recursive folder scanning if needed.
4. Set the "From" format to HDR and the "To" format to ICO.
5. Click Convert. ICO files are written to the output folder, fully offline.

• 100% offline — your HDRI maps and lighting data are never uploaded anywhere
• Produces standard Windows ICO files for icons and favicons
• Bulk conversion of entire folders, including sub-folders, in one click
• Multi-core processing for fast handling of large batches
• Option to delete original HDR files automatically after conversion
• No recurring subscription or hidden upload limits