Add a browser-readable ICO
Drop, paste, or choose an ICO up to 50 MB that your browser can decode. The tool works from the rendered image the browser supplies, not from a chosen ICO container entry.
Free Online ICO to ICNS PNG icon pack
Package a browser-decoded ICOinto six ICNS PNG icon sizes.
Create a macOS ICNS icon family from an ICO your browser can decode. The tool rasterizes the browser-decoded ICO image locally, then packages that rendered pixel image as six PNG-backed square entries. It does not edit the original ICO container or choose one of its source icon entries.
- Private by design
- Default ICNS
- Paste supported
Files stay in this browser
All conversion runs on-device
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About this converter
Free ICO to ICNS conversion, built for a real workflow.
ICO is an icon container that can hold more than one representation, while this browser workflow starts with the one image the browser decodes from the ICO. It rasterizes those decoded pixels to one canvas and packages PNG-backed ICNS entries at 16, 32, 64, 128, 256, and 512 pixels. Each entry uses contain scaling: the complete decoded image is scaled to fit a square, centered, and given transparent padding where needed. The tool does not select a source ICO entry, automatically crop or reframe artwork, recover vectors or detail, remove a background, or guarantee an output file size. The result is an icon-family file only, not a macOS application bundle.
- ICO input is decoded by your browser into one rendered image. This workflow does not inspect the ICO container or let you select an embedded source icon entry.
- The ICNS download contains six PNG-backed entries: 16, 32, 64, 128, 256, and 512 pixels. It is an icon-family file, not a macOS app bundle and not a 1024-pixel icon export.
- Each entry uses contain scaling and transparent padding. The complete decoded image is centered in its square instead of being automatically cropped, zoomed, or reframed.
- PNG entries can carry transparency already present in the decoded ICO pixels. The tool does not identify or remove an opaque background, and it does not create transparency.
- ICNS packages raster pixels rather than editable vector paths, layers, text, or source icon data. Output size depends on the rendered pixels and PNG encoding, so it is not guaranteed to be smaller or a particular size.
How it works
Upload once.
Export ICNS.
Keep ICNS selected
ICNS is preselected when you need a macOS icon-family file. The tool makes six PNG-backed square entries from the complete browser-decoded image.
Download and inspect
Create the ICNS locally, then inspect its 16px and 32px entries in the receiving project or icon viewer. Check centering, transparent padding, background behavior, and legibility before use.
Made for real pipelines
ICO to ICNS.
One workspace.
Convert without uploading your assets. Switch outputs anytime — web, print, icons, and document targets from the same batch.
Package ICO pixels as ICNSBrowser-decoded ICO pixels
Create ICNS from the one image your browser decodes from the ICO, without claiming to inspect or select source icon entries.
Six PNG-backed icon sizes
Package 16, 32, 64, 128, 256, and 512 pixel entries in one ICNS file for a macOS workflow that requires an icon family.
Whole-image contain scaling
Keep the complete decoded image centered with transparent padding instead of automatically cropping, zooming, or reframing the artwork.
Good to know
Questions, answered.
How does this ICO to ICNS converter read my ICO?+−
It asks your browser to decode the ICO into one rendered image, then creates the ICNS from those decoded pixels. It does not edit the ICO container itself, inspect every embedded representation, or provide source ICO entry selection.
Which ICNS icon sizes does this tool create?+−
It packages PNG-backed ICNS entries at 16, 32, 64, 128, 256, and 512 pixels. It does not create a 1024-pixel entry or a macOS application bundle.
Will the tool crop my ICO into a square icon?+−
No. It uses contain scaling: the complete browser-decoded image is scaled to fit each square, centered, and surrounded by transparent padding where needed. Wide, tall, or detailed artwork can therefore appear small at lower icon sizes.
Will ICNS remove my ICO background or make it transparent?+−
No. PNG-backed ICNS entries can retain transparency already present in decoded ICO pixels, but the conversion does not detect or remove an opaque background and does not create transparency. An opaque source remains opaque.
Can the conversion recover detail or guarantee a smaller file?+−
No. The ICNS is made from the browser-rendered ICO pixels, so it cannot restore lost detail, vectors, editable layers, or source icon data. Its file size depends on the rendered pixels and PNG encoding and is not guaranteed to be smaller or any particular size.
Is ICO to ICNS free, private, and suitable for batches?+−
Yes. The tool is free, needs no account, and processes supported ICO files in your browser rather than sending them to a conversion server. You can queue up to 50 files, each up to 50 MB; images over 12 megapixels are rejected during rasterization.