Convert Windows icons (ICO) online for free
The converter easily converts your ICO icons to various formats - free and online. No Microsoft Windows or or other Raster Image software needed.
The converter also works in reverse, so you can convert other "Icon Container File" formats to ICO without using software like Microsoft Windows or a similar tool.
The .ICO file is an image container format built specifically for Microsoft Windows to display computer icons. It functions as a single wrapper that stores multiple pixel dimensions (typically ranging from 16x16 to 256x256) and color depths of the same image. This allows the Windows operating system to automatically select the sharpest icon size based on the user's display scaling. You can view them natively in the Windows OS, but editing them requires specialized software like Axialis IconWorkshop or third-party plugins for Adobe Photoshop.
The .ICO format is highly specialized and poses significant challenges for standard design workflows. It is deeply tied to the Windows ecosystem and lacks native support in standard image viewers on macOS or Linux. Because a single .ICO file often contains multiple uncompressed bitmaps, file sizes can become bloated and inefficient. While historically required as a favicon.ico for website tabs, modern web standards have moved on to lighter, scalable formats.
For modern web design and favicons, convert .ICO to SVG or WebP. For Apple software environments, convert to ICNS (Apple Icon Image format). If you need to edit the graphic, convert it to PNG to preserve transparency. Drop your file here to view and convert it securely right in your browser - free, online, and without installing software.
Use Convert.Guru to open and convert your ICO file.
Users also converted ICON, DLL, PNG, EXE, JPG, ANI, CD, RC, ZIP, ISO, EDS, ICL and SDB files.
If you want to convert ICO file to ICNS, CUR, DLL, EXE or DRV, you can use Microsoft Windows or similar software from the "Windows and Web Favicon Storage" category. In the File menu, look for Save As… or Export….
To convert MSI, EXE, REG, MST, LNK, CAB, DRV, INF, MSU or DLL files to ICO, try Microsoft Windows or another comparable tool in the "Windows and Web Favicon Storage" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our ICO converter.