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File Converters TIFF and PDF apps Forensic Freeware1) Upload ICO file to convert
Drop files here, or Click to select
2) Set converting ICO to PNG options
3) Get converted file
Total Image Converter
JPEG, TIFF, PSD, PNG, etc.Rotate ImagesResize ImagesRAW photosWatermarksClear interfaceCommand line💾 Upload Your File: Go to the site, click on «Upload File,» and select your ICO file.
✍️ Set Conversion Options: Choose PNG as the output format and adjust any additional options if needed.
Convert and Download: Click 👉«Download Converted File»👈 to get your PNG file.
| File extension | .ICO |
| Category | Image File |
| Description | An ICO format is destined for storing icons in Windows. One such file can store a few icons with different size and colors for each. ICO supports square image 16 - 128 pixels. Today’s ICO version supports PNG and JPEG images integration, though icons are usually stored uncompressed. ICO supports true and high color depth, as well as fixed color palette 2 - 256 tones. The image structure is mostly similar to BMP, except the mast put on the background to implement the full image transparency. |
| Associated programs | Adobe Photoshop Microsoft Paint Windows Picture and Fax Viewer |
| Developed by | Microsoft |
| MIME type | image/x-icon |
| Useful links | More detailed information on ICO files |
| Conversion type | ICO to PNG |
| File extension | .PNG |
| Category | Image File |
| Description | PNG images provide lossless compression, that is why the quality of the picture is nice, but the size of the file is huge. Because of it this file format is used by photographers. PNG may have several layers of transparency and even include short text descriptions which help search engines to examine the file. Although PNG was developed to replace GIF and partly other formats, it doesn’t support animation since it can’t contain several images like GIF. |
| Associated programs | Apple Preview Corel Paint Shop Pro GIMP - The GNU Image Manipulation Program (LINUX) Microsoft Windows Photo Gallery Viewer Safari |
| Developed by | PNG Development Group |
| MIME type | image/png |
| Useful links | More detailed information on PNG files |
ICO is the Windows icon format — a specialized container that bundles multiple image sizes (16×16, 32×32, 48×48, 256×256) and color depths into a single file, designed specifically for use as application icons, shortcut icons, and favicons. This multi-resolution structure makes ICO ideal for Windows icon use but awkward everywhere else: web editors, design tools, image processors, and non-Windows platforms expect standard image formats, not icon containers. PNG is the universal solution — lossless, supports full transparency, and accepted by every tool and every browser. Converting ICO to PNG extracts the highest-resolution image from the icon container into a clean, universally usable file.
ICO is Microsoft's icon file format, introduced with Windows 1.0 and used by every version of Windows since. An ICO file is a container that holds multiple versions of the same icon at different resolutions and bit depths — for example, a single ICO file might contain 16×16, 32×32, 48×48, and 256×256 images, each optimized for a specific display context (taskbar, desktop, shell, high-DPI). Modern ICO files use PNG compression for the largest sizes (256×256 and higher) and raw BMP storage for smaller sizes. ICO files also support 32-bit color with full alpha transparency, enabling smooth edges against any background color.
| Property | ICO | PNG (Portable Network Graphics) |
|---|---|---|
| Purpose | Windows icon container — multi-size bundle | General-purpose lossless image |
| Sizes contained | Multiple (16, 32, 48, 256 px in one file) | Single image at one resolution |
| Transparency | 32-bit alpha (modern ICO) | Full 8-bit alpha channel |
| Web browser image use | Only as favicon (<link rel="icon">) | Universal — <img>, CSS, canvas, SVG |
| Design tool support | Not standard — requires plugin or conversion | Native in every design and photo tool |
| Mobile platform icon | Not supported — Android/iOS use PNG | Required format for Android and iOS icons |
| Compression | Mixed (BMP raw + PNG chunks) | DEFLATE lossless compression |
| Cross-platform use | Windows-specific purpose | ISO standard — universal |
The converter reads the ICO file's directory structure, which lists each embedded image along with its dimensions, bit depth, and byte offset within the file. For modern ICO files, large sizes (256×256 and above) are stored as embedded PNG data — the converter extracts these directly as PNG without re-encoding, preserving the exact pixel data. For smaller sizes stored as raw BMP pixel data, the converter reads the DIB (Device-Independent Bitmap) header and pixel buffer, composites the XOR mask and AND mask for transparency, and encodes the result as a 32-bit RGBA PNG with a proper alpha channel. The highest available resolution is selected by default for the output PNG.
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