Free online ICO to HEIC converter

A photo library, Apple-focused workflow, or import tool may accept HEIC but not Windows .ico files. Converting extracts one icon image as a standard raster file, but it does not retain the ICO file’s alternate icon sizes or its use as a Windows icon.

ICO format

ICO is the Windows icon container format used for application icons, shortcuts, executable resources, folders, and some website favicons. One .ico file can hold multiple raster images at different dimensions, commonly 16×16, 32×32, 48×48, and 256×256 pixels.

ICO entries can include transparency. Larger entries are often PNG-compressed, while older icons may use bitmap data and an alpha or mask channel. A conversion normally exports one embedded image, not the complete multi-resolution icon set.

HEIC format

HEIC is the usual filename extension for still images stored in the HEIF container, most often encoded with HEVC/H.265. Apple devices commonly use HEIC for photos because it can deliver comparable visual quality to JPEG at a smaller size.

HEIC can support alpha transparency, but transparent HEIC files are not handled consistently by every encoder, viewer, or destination application. HEIC is intended for raster-image storage; it cannot replace an ICO file in a Windows shortcut, executable resource, or icon assignment dialog.

HEIC compression is usually lossy. It can be useful when a receiving system specifically requires HEIC, but small flat-color icons may show edge artifacts and may not be smaller than a PNG or compact ICO because of codec overhead.

Convert an ICO file to HEIC

1. Upload the .ico file to the ICO-to-HEIC converter on 101convert.com.
2. Select HEIC as the output format.
3. If the converter offers embedded-image or size selection, choose the largest source image or the dimensions required by the destination application.
4. Convert and download the resulting .heic file.
5. Open the output in the target application before converting a batch of files.

Use the largest available ICO entry when the image will be displayed larger than an icon. Upscaling a 16×16 or 32×32 source cannot recover detail that was not present in the icon.

Desktop conversion with ImageMagick

ImageMagick can perform local conversion when it was built with HEIC/HEIF support, typically through libheif. Inspect the ICO file first to identify its embedded images and dimensions:

magick identify input.ico

Select an embedded image by its zero-based index. This command converts the first image at quality 90:

magick input.ico[0] -quality 90 output.heic

Replace [0] with the index for the required image. If the command reports that HEIC is unsupported, install an ImageMagick build with HEIC support rather than changing the file extension.

Compatibility and quality limits

HEIC support is native on current Apple operating systems, but support elsewhere varies. On Windows, opening HEIC may require Microsoft’s HEIF Image Extensions and, for HEVC-encoded files, HEVC codec support. Some browsers, legacy applications, and image editors cannot display HEIC.

Check transparency against a colored or patterned background in the receiving application. If it removes alpha or displays a solid background, use PNG instead if the destination accepts it.

For icons with sharp text, one-pixel outlines, or flat-color edges, retain the original ICO and test the HEIC at its final display size. HEIC is not an archival substitute for the source: keep the original ICO when its multiple resolutions or Windows icon behavior are needed.