01
Right-sized output for the use case
Converting from HDR to ICO aligns the file with the encoding choices the downstream pipeline expects. The result is a deliverable that fits naturally into the destination workflow.
100% local
IMAGE
Convert HDR
to ICO
Right-sized output for the use case.
Converting from HDR to ICO aligns the file with the encoding choices the downstream pipeline expects. The result is a deliverable that fits naturally into the destination workflow.
— Drop area
WHY CONVERT
Why convert HDR to ICO
02
Acceptance by downstream tools
ICO is the format most receiving systems expect for this kind of content. Converting upstream avoids the rejection and silent re-encoding that often happen when HDR reaches an unprepared pipeline.
03
Portable, predictable file format
ICO is well documented and decodable by long-lived tooling, which matters for archives, deliverables, and any file that needs to outlive the software that created it.
— How to convert
HDR to ICO in three steps.
- 01
Open LocalConvert
Visit this page on any modern browser — no install, no signup, no plugin.
- 02
Drop or select your HDR file
Drag your HDR into the drop area, or click to pick one from your device.
- 03
Click Convert
Conversion runs entirely in your browser. When it's done, your ICO file downloads to your device.
QUALITY & FIDELITY
Quality and fidelity
- Lossless to lossless: conversion is mathematically reversible in principle.
- Target supports alpha but the source has none, so the output is fully opaque.
- Metadata is dropped: the target format does not carry it natively.
Transparency HDR
✗ ICO
✓
Color depth 32-bit float RGB (HDR) 8-bit RGBA
Metadata preserved ✗
FORMAT SPECS
Format specifications
| HDR | ICO | |
|---|---|---|
| Extensions | .hdr .pic | .ico |
| MIME types | image/vnd.radiance | image/vnd.microsoft.icon image/x-icon |
| Introduced | 1989 | 1985 |
| Maintainer | Radiance / Greg Ward | Microsoft |
| Magic # | — | 00 00 01 00 |
| Spec | View spec ↗ | View spec ↗ |
COMPATIBILITY
Where these formats work
| Platform | Windows | macOS | iOS | Android | Chrome | Firefox | Safari | Edge |
|---|---|---|---|---|---|---|---|---|
| ICO | Native | App | App | App | Native | Native | Native | Native |
ICO
- Windows
- Native
- macOS
- App
- iOS
- App
- Android
- App
- Chrome
- Native
- Firefox
- Native
- Safari
- Native
- Edge
- Native
Why LocalConvert
How LocalConvert compares
| Category | LocalConvert | Cloud converters |
|---|---|---|
| PRIVACY | Files never leave your device. The whole pipeline runs in your browser via WebAssembly. | Files travel to a remote server, sit in queue storage, and may be retained for analytics or moderation. |
| COST | Free, no signup, no daily quotas. | Often free for small files; paid tiers for batch / large / commercial use. |
| LIMITS | Limited only by your device's memory and CPU. Multi-GB files OK on desktop. | Typical 100 MB to 1 GB per-file caps, plus rate limits. |
— The formats
From · HDR
Radiance HDR
A high-dynamic-range raster format used in 3D rendering and HDR photography.
Typical uses
HDR photography, environment maps for 3D.
To · ICO
Windows Icon
A container that can hold multiple sizes and bit depths of an icon image. Used for application icons and browser favicons.
Typical uses
Favicons, Windows app icons.
— FAQ
Frequently asked.
Is HDR to ICO conversion free?
Yes. LocalConvert is completely free, with no signup and no per-file or per-day limits.
Do my files get uploaded anywhere?
No. HDR to ICO conversion happens entirely inside your browser using WebAssembly — your file never leaves your device.
What's the maximum file size?
There's no fixed cap — the practical limit is your device's available memory. Very large files may take longer or fail on low-RAM devices.
Does it work offline?
Yes — once the page has loaded, HDR to ICO conversion works without an internet connection. Re-open the page once to cache it.
Will conversion preserve quality?
LocalConvert uses the industry-standard tools (FFmpeg, ImageMagick, Pandoc) — quality matches what professionals use on the command line. Lossy formats will still lose some quality on each re-encode.
— Related
Or convert these.
Browse all conversionsREFERENCES
Format references
Last verified:
100% local conversion.
HDR to ICO is processed in your browser with WebAssembly. No upload, no tracking, no limits. Your file never leaves your device.