100% Free No Upload Bulk Conversion

Bulk ICO to HDR Converter — Free, No Upload

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

ICO HDR · ZIP

Bulk ICO → HDR Converter

Select files, convert, download ZIP — all locally

Drop ICO files here or click to browse

Supports batch selection — convert hundreds of files

ICO → HDR ZIP

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✓ Conversion completed! All files converted successfully. Click Download ZIP to save them.

Why convert ICO to HDR?

convert.dynamic_reason.template_6 convert.dynamic_reason_closing.closing_9

Transparent areas will be filled with white background

Property	ICO	HDR
Full name	Icon Image Format	High Dynamic Range Image
Compression	Lossless	Lossless
Color depth	32-bit	32-bit float
Transparency	Yes	No
Web support	Yes	No
Developed by	Microsoft (1985)	Radiance / Greg Ward (1989)
Max colors	16.7M	floating point
MIME type	`image/x-icon`	`image/vnd.radiance`
Category	Raster image	Raster image
Year gap	4 years apart in technical development
Best for	Website favicons and app icons	High dynamic range photography
Estimated size change	Typically 10%-20% smaller

Select your ICO files

Drag & drop or click to choose multiple ICO images. No file size restrictions.

Start the conversion

Click "Convert to :to" — your files are processed locally using Canvas API. No upload, no waiting.

Download ZIP archive

All converted HDR files are bundled into a single ZIP. One click, everything saved.

convert.usecases_groups.group_7.0

convert.usecases_groups.group_7.1

convert.usecases_groups.group_7.2

convert.usecases_groups.group_7.3

If your image has transparency, consider converting to PNG instead to preserve it
Use the ZIP download to get all converted files in a single click
All processing is private — files are never uploaded to any server

convert.faq_groups.group_11.0.a

convert.faq_groups.group_11.1.a

convert.faq_groups.group_11.2.a

convert.faq_groups.group_11.3.a