Convert macOS icons (ICNS) to PNG locally - the highest-resolution image extracted losslessly, no upload.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
ICNS is Apple's icon format: an .icns file is a container that bundles the same symbol at several sizes - from a small list icon up to a 1024x1024 retina image - so macOS can pick the right resolution for each display. Outside macOS, though, hardly any program opens it. This tool reads the container, finds the highest-resolution embedded image and outputs it as a universal PNG you can display and reuse anywhere.
Modern ICNS files (macOS 10.7 and newer) store each size as a complete PNG. It is exactly that PNG that is extracted here unchanged - a true lossless extraction with no re-encoding, so pixels and transparency are preserved exactly. Everything runs entirely locally in your browser (pure JavaScript, no upload, even offline, no third-party library). Older ICNS with RLE symbols or embedded JPEG2000 are rejected honestly rather than producing a wrong image.
You will meet this when you want to reuse a Mac application's app icon, drop a symbol into a web page or document, or view an icon on Windows or Linux where .icns is unsupported. PNG is lossless and transparency-capable - ideal for crisp symbols with clean edges. The largest contained resolution is taken on purpose; smaller variants can be scaled down from the PNG if needed.
| Input formats | ICNS |
|---|---|
| Output format | PNG |
| Batch processing | Yes |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: It extracts the highest-resolution PNG embedded in the ICNS - lossless and with transparency preserved. Modern ICNS with PNG entries (macOS 10.7+) are supported; older ICNS with pure RLE symbols or embedded JPEG2000 are rejected with a clear error. It does not export every size separately, but the largest one.
Apple's icon format. A container that bundles the same symbol at several sizes so macOS can pick the right resolution.
No. The conversion happens entirely locally in the browser - even offline.
The highest resolution contained in the ICNS (up to 1024x1024). You can scale smaller variants down from the PNG.
Yes. The embedded PNG is extracted unchanged, so the alpha channel is preserved exactly.
Then it only contains older RLE or JPEG2000 symbols without PNG. Modern ICNS (macOS 10.7+) store PNG and work.