EXR to ICO: conversion guide

Drop EXR files here

or choose files from your device

Converter not available yet

OpenEXR needs a dedicated floating-point pipeline that is not implemented yet.

In your browser
No upload
Private by design

What happens when you convert EXR to ICO?

EXR channels & deep data

An EXR may carry named auxiliary channels, multipart images or deep samples, beyond a flat RGB image. A rendered ICO copy is not an equivalent EXR working file. Channel selection, deep compositing and numeric mapping need explicit engine support; no export of every channel or depth sample is implemented.

Multiple source images

EXR can contain multiple image representations with different roles. These are not automatically a timed animation. Selecting an image, preserving a collection or creating several outputs needs explicit engine support; neither a first-image choice nor an all-images export is implemented.

HDR to SDR

If HDR source content is exported through an SDR representation, it needs a display rendering. Values outside the output range require tone mapping, scaling or clipping; brightness relationships can change. Tone mapping, exposure and colour handling depend on the future engine. Renaming or lossless compression cannot preserve out-of-range values.

Encoding mode

ICO compression depends on the embedded image payload. Multiple sizes are alternatives, not animation frames; transparency handling differs between old masks and alpha-capable images. ICO permits different encoding modes or container representations. Its format name alone does not promise lossless output, a quality setting or a size reduction. The future engine must choose a supported codec and sample representation; inspect the target’s compression notes below.

EXR

Source

EXR

OpenEXR

Compression: Lossy & losslessTransparency: YesMetadata: Typed header attributes, Chromaticities

HDR raster data for rendering and compositing, with named channels and lossless or lossy codecs.

Explore EXR format →

ICO

Target

ICO

Windows Icon

Compression: Depends on variantTransparency: YesMetadata: Image dimensions, Colour depth

An icon resource containing several raster sizes and colour depths, with masks or alpha for transparency.

Explore ICO format →

Is EXR → ICO right for you?

Good choice when

ICO fits your delivery use: Application icons & favicons.
You need a rendered view of selected EXR image data.
You can choose the source image or part needed for delivery.
You need an SDR delivery copy and can review its tone mapping.

Probably not when

You need every auxiliary channel or deep sample for compositing.
You require a complete collection, page set or multipart round trip.
You need the original HDR range for relighting or grading.
You need automatic icon design or guaranteed multi-size packaging.

Conversion considerations

An EXR may carry named auxiliary channels, multipart images or deep samples, beyond a flat RGB image. A rendered ICO copy is not an equivalent EXR working file. Channel selection, deep compositing and numeric mapping need explicit engine support; no export of every channel or depth sample is implemented.
EXR can contain multiple image representations with different roles. These are not automatically a timed animation. Selecting an image, preserving a collection or creating several outputs needs explicit engine support; neither a first-image choice nor an all-images export is implemented.
If HDR source content is exported through an SDR representation, it needs a display rendering. Values outside the output range require tone mapping, scaling or clipping; brightness relationships can change. Tone mapping, exposure and colour handling depend on the future engine. Renaming or lossless compression cannot preserve out-of-range values.

EXR to ICO conversion details

EXR channels & deep data: An EXR may carry named auxiliary channels, multipart images or deep samples, beyond a flat RGB image. A rendered ICO copy is not an equivalent EXR working file. Channel selection, deep compositing and numeric mapping need explicit engine support; no export of every channel or depth sample is implemented.
Multiple source images: EXR can contain multiple image representations with different roles. These are not automatically a timed animation. Selecting an image, preserving a collection or creating several outputs needs explicit engine support; neither a first-image choice nor an all-images export is implemented.
HDR to SDR: If HDR source content is exported through an SDR representation, it needs a display rendering. Values outside the output range require tone mapping, scaling or clipping; brightness relationships can change. Tone mapping, exposure and colour handling depend on the future engine. Renaming or lossless compression cannot preserve out-of-range values.
Icon packaging: ICO can package alternative icon sizes and image encodings. Converting one image does not automatically design a readable small icon or generate every required size. Resampling, image entries, alpha/mask representation and encoding are future engine choices; check the target application’s icon requirements.
Transparency representation: Both format profiles allow transparency, but this does not promise identical alpha representation. Source variants, target channel precision and alpha interpretation matter. The future encoder must explicitly carry or convert transparency; merely choosing ICO guarantees no alpha transfer.
Encoding mode: ICO compression depends on the embedded image payload. Multiple sizes are alternatives, not animation frames; transparency handling differs between old masks and alpha-capable images. ICO permits different encoding modes or container representations. Its format name alone does not promise lossless output, a quality setting or a size reduction. The future engine must choose a supported codec and sample representation; inspect the target’s compression notes below.
Sample precision & colour: Source and target sample models can differ in precision, channel layout, colour space and transfer function. Lossless compression only preserves the samples actually encoded; a precision reduction or colour conversion can already change them. The future engine defines numeric mapping, orientation and colour conversion; canonical depth facts are listed below where available.
Metadata & colour: Format support does not guarantee that an export preserves metadata or colour profiles. Retention and colour handling depend on the future converter; its engine is not implemented yet.
Compression: EXR: Lossy & lossless → ICO: Depends on variant EXR: EXR supports lossy and lossless codecs. Choose one for the sample types and required precision; .exr alone does not guarantee exact channel preservation. ICO: ICO compression depends on the embedded image payload. Multiple sizes are alternatives, not animation frames; transparency handling differs between old masks and alpha-capable images.
Transparency: EXR: Yes → ICO: Yes
Colour depth: EXR: HALF 16 / FLOAT 32 / UINT 32
HDR: EXR: Floating-point working values
Multiple images: EXR: Multipart → ICO: Alternative icon sizes
Dimensions: Pixel dimensions, page geometry, rendering resolution, resizing and orientation need explicit converter policies. The future engine has not defined them yet.
Metadata: EXR: Typed header attributes, Chromaticities → ICO: Image dimensions, Colour depth. Which fields are copied, rewritten or omitted will depend on the future engine; retention is not implemented yet.

Common questions

Will all EXR channels and deep samples survive?

Will every source image be exported?

How will HDR brightness be mapped?

Are bit depth and colour values guaranteed to match?

Source and target sample models can differ in precision, channel layout, colour space and transfer function. Lossless compression only preserves the samples actually encoded; a precision reduction or colour conversion can already change them. The future engine defines numeric mapping, orientation and colour conversion; canonical depth facts are listed below where available.

Will metadata and colour profiles be retained?

EXR: Typed header attributes, Chromaticities → ICO: Image dimensions, Colour depth. Which fields are copied, rewritten or omitted will depend on the future engine; retention is not implemented yet.