ICO Viewer
Open Windows ICO icon files, free.
About
ICO is the icon format used by Windows for application and file icons. A single ICO file can contain multiple resolutions. Void displays every embedded size so you can inspect an icon at each resolution.
Native support
| Environment | Support |
|---|---|
| Chrome / Edge | Supported |
| Firefox | Supported |
| Safari | Supported |
| Windows Explorer | Supported |
How to Open ICO Files on Windows with VoidImageViewer
Locate the .ico file
Windows uses .ico files for shortcuts, favicons and application icons. Explorer shows the artwork as the file thumbnail, but there is often no default viewer for double-click.
Right-click → Open with
Right-click the .ico file → Open with → Choose another app → Void Image Viewer. It lists every resolution embedded in the icon — typically 16×16, 32×32, 48×48 and 256×256 — so you can inspect each size.
Extract a size as PNG
Need one resolution as a normal image? Open the icon in the VoidImageViewer desktop app and export it to PNG at the size you need.
Preview in the browser
Drag the .ico into the preview tool on this page — browsers decode ICO natively, and the file never leaves your PC.
Why Open .ico Files with VoidImageViewer
Inspecting every embedded resolution inside an .ico needs a viewer that understands the container — VoidImageViewer does, and it is free, open source under the MIT license. No ads, no telemetry, fully offline, with a published SHA256 checksum on every download so you can verify before installing.
Open ICO files
The online preview lets you view the file. To edit, batch-convert, or set it as your default Windows viewer, use the free desktop app.
Frequently asked
Windows Explorer shows .ico files as their icon artwork, but double-clicking rarely opens a proper viewer. Right-click the file → Open with → Void Image Viewer to see every embedded resolution, from 16×16 up to 256×256.
Windows picks the closest stored resolution for each context — 16×16 for file lists, 32×32 for desktop views, up to 256×256 for large icons. A single .ico bundles them all so the icon stays sharp everywhere.
Yes. Open the .ico in the VoidImageViewer desktop app and export it to PNG at the resolution you need — handy for reusing a Windows icon on the web or in design tools.
No. ICO stores static icons; .cur uses the same container for a mouse cursor with a hotspot coordinate, and .ani wraps animated cursors. They are related formats with different purposes.
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Instant Format Preview
No install required — works right here in your browser.
Drop an image here, or click to browse
ICO · .ico