Why can't browsers convert ICO to HEIC directly?

HEIC uses the HEVC (H.265) codec for compression. No browser exposes a Canvas-based HEIC encoder because HEVC is patent-encumbered and requires licensing. Desktop tools like ImageMagick, GIMP, and FFmpeg bundle licensed or open-source HEVC encoders that can produce native HEIC output.

Is my ICO file uploaded to a server?

No. The inspector reads your ICO file entirely in your browser using the FileReader API. Your file bytes never leave your device.

Which ImageMagick version supports HEIC output?

ImageMagick 7.0.8-25 or later with the libheif delegate compiled in. Run "magick -list format | grep HEIC" to confirm support. On macOS, Homebrew's ImageMagick formula includes HEIC by default.

Will HEIC preserve transparency from my ICO?

Yes. HEIC/HEIF supports an alpha channel, so transparent areas in your ICO frames will be preserved when you use ImageMagick or GIMP with the correct export settings.

Which ICO frame should I convert to HEIC?

Use the inspector to view all embedded sizes, then choose the largest resolution (typically 256x256) for the best quality HEIC output. Upscaling a small frame produces blurry results.

Can I convert multiple ICO files to HEIC at once?

Yes. ImageMagick supports shell globbing: "magick mogrify -format heic *.ico" converts every ICO in the current directory. FFmpeg requires a loop script for batch processing.

Does GIMP support HEIC export on Windows?

GIMP 2.10.28 and later include HEIC export on Windows via the bundled libheif plugin. On older versions you may need to install the libheif plug-in separately.

ICO to HEIC Converter

Name: ICO to HEIC Converter
Availability: InStock
Author: Nham Vu

Inspect your ICO file in the browser and follow step-by-step guides to convert it to HEIC using ImageMagick, GIMP, or FFmpeg.

Browser limitation

Browsers cannot encode HEIC due to codec patent restrictions. This inspector reads your ICO file locally — then use the guides on the right to convert with a desktop tool.

ICO File Inspector

Click or drag an ICO file here

Inspection only — file never leaves your device

How to Convert ICO to HEIC

Choose a free desktop tool below. All methods preserve transparency and run entirely offline.

1

Install ImageMagick

macOS: brew install imagemagick — Windows: download the installer from imagemagick.org — Linux: sudo apt install imagemagick libheif-dev
2

Verify HEIC support

magick -list format | grep -i heic

You should see a line containing HEIC. If not, install libheif and recompile or reinstall.
3

Convert a single ICO frame (largest size)

magick icon.ico[0] -quality 85 output.heic

[0] selects the first (largest) frame. Use [1], [2]… for other frames. Quality 85 is a good balance of size and sharpness.
4

Batch convert all ICO files in a folder

magick mogrify -format heic -quality 85 *.ico

This overwrites the originals with HEIC versions in-place. Make a backup first or use magick convert for individual files.

1

Install FFmpeg with libheif

macOS: brew install ffmpeg — Linux: sudo apt install ffmpeg — Windows: download a static build from ffmpeg.org/download. Confirm HEIC support:

ffmpeg -encoders 2>/dev/null | grep hevc
2

Convert a single ICO to HEIC

ffmpeg -i icon.ico -vframes 1 -q:v 2 output.heic

-vframes 1 extracts the first (largest) frame. -q:v 2 sets near-lossless quality (lower = better, range 0–51).
3

Batch convert with a shell loop

for f in *.ico; do ffmpeg -i "$f" -vframes 1 -q:v 2 "${f%.ico}.heic"; done

Run this in bash (macOS/Linux) or Git Bash on Windows. It converts every ICO in the current folder and saves a matching .heic file alongside it.
4

Verify the output

ffprobe output.heic

This prints codec and stream info for the output file. Look for hevc in the codec line to confirm successful HEIC encoding.

Quality vs. File Size Tips

Icons (16–48 px)

Use quality 90+. Small flat-color images need higher quality settings to preserve sharp pixel edges.

Medium (64–128 px)

Quality 80–85 strikes the best balance — visually lossless at 40–50% smaller than PNG.

Large (256 px+)

Quality 75–80 works well. HEIC excels at this size — typically half the file size of JPEG at equal visual quality.

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