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ICO to HEIC: conversion guide

Source · ICO
Target · HEIC

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What happens when you convert ICO to HEIC?

Multiple source images

ICO 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.

Encoding mode

HEIC commonly uses lossy HEVC; HEVC also has lossless coding tools. Actual quality, bit depth and chroma depend on the encoded profile and settings, not on the .heic extension. HEIC 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.

ICO

Source

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 →
HEIC

Target

HEIC

High Efficiency Image File Format (HEVC)

Compression: Lossy & losslessTransparency: YesMetadata: Exif, XMP, ICC, NCLX

HEVC-coded photographs in HEIF, with room for auxiliary images and capture metadata.

Explore HEIC format →

Is ICO → HEIC right for you?

Good choice when

  • HEIC fits your delivery use: Device photography & image collections.
  • You can choose the source image or part needed for delivery.
  • You need a transparency-capable destination and will check its supported variant.
  • Your receiving application supports the required HEIC variant.

Probably not when

  • You require a complete collection, page set or multipart round trip.
  • You assume format-level alpha support guarantees matching transparent edges.
  • You need a guaranteed quality or file size before encoder settings exist.
  • You require identical samples without a defined colour and precision policy.

ICO to HEIC conversion details

Multiple source images
ICO 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.
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 HEIC guarantees no alpha transfer.
Encoding mode
HEIC commonly uses lossy HEVC; HEVC also has lossless coding tools. Actual quality, bit depth and chroma depend on the encoded profile and settings, not on the .heic extension. HEIC 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
ICO: Depends on variant → HEIC: Lossy & lossless 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. HEIC: HEIC commonly uses lossy HEVC; HEVC also has lossless coding tools. Actual quality, bit depth and chroma depend on the encoded profile and settings, not on the .heic extension.
Transparency
ICO: Yes → HEIC: Yes
Animation
ICO: No → HEIC: Yes
Colour depth
HEIC: Codec/profile dependent
HDR
HEIC: Codec/profile dependent
Multiple images
ICO: Alternative icon sizes → HEIC: Collections & sequences
Dimensions
Pixel dimensions, page geometry, rendering resolution, resizing and orientation need explicit converter policies. The future engine has not defined them yet.
Metadata
ICO: Image dimensions, Colour depth → HEIC: Exif, XMP, ICC, NCLX. Which fields are copied, rewritten or omitted will depend on the future engine; retention is not implemented yet.

Common questions

Will every source image be exported?

ICO 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.

Which compression mode will HEIC use?

HEIC commonly uses lossy HEVC; HEVC also has lossless coding tools. Actual quality, bit depth and chroma depend on the encoded profile and settings, not on the .heic extension. HEIC 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.

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?

ICO: Image dimensions, Colour depth → HEIC: Exif, XMP, ICC, NCLX. Which fields are copied, rewritten or omitted will depend on the future engine; retention is not implemented yet.

Explore related ICO and HEIC conversions.

Other targets for ICO

ICO→PNG
ICO → PNG
ICO→BMP
ICO → BMP
ICO→WebP
ICO → WebP

Other sources for HEIC

HEIF→HEIC
HEIF → HEIC
JPEG→HEIC
JPEG → HEIC
AVIF→HEIC
AVIF → HEIC