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ICNS Converter

Convert ICNS files to PDF online, free.

  • Free to use
  • No file stored beyond 1 hour
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Maximum file size is 1GB

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Three steps to your converted file

Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.

  1. Upload your file

    Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.

  2. Choose an output format

    Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.

  3. Convert & download

    Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.

What is an ICNS file?

Apple Icon Image

Developed By
Apple Inc.
Initial Release
2001
MIME Type
image/x-icns

The ICNS format is the standard icon resource file type used by the macOS operating system to display scalable application icons in Finder and the Dock. It acts as a container capable of storing multiple image representations at varying resolutions (from 16x16 to 1024x1024 pixels) and bit depths to ensure visual clarity on diverse display densities, including Retina displays. Internally, ICNS files utilize different compression algorithms based on the icon version, ranging from uncompressed raw data and Run-Length Encoding (RLE) to JPEG 2000 and PNG compression for larger assets.

How to open an ICNS file

ICNS files open natively in macOS using the Preview app. On non-Apple operating systems, standard image viewers generally cannot interpret the multi-resource structure of an ICNS container. Windows and Linux users must employ specialized software such as XnView, IcoFX, or GIMP to view or extract individual icon layers. For conversion to web-friendly formats, command-line tools like libicns or ImageMagick are frequently utilized by developers.

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