About this conversion
ICO is the format used for Windows application icons and website favicons. This tool wraps your PNG as a valid embedded-PNG ICO file, supported by every modern browser and by Windows. For a complete favicon package (multiple sizes plus apple-touch-icon), use this tool’s dedicated favicon generator after uploading your image.
Frequently asked questions
What’s the size limit for ICO?
ICO can only represent images up to 256×256 pixels -- this is a hard limit of the file format itself, not a restriction of this tool.
Is this good enough for a real favicon.ico?
For a single size, yes. For a proper favicon package with multiple sizes bundled into one file (which browsers use to pick the sharpest size), use the "Export presets → Favicon package" option after uploading -- it’s specifically built for this.
Does this work for app icons too?
Yes -- ICO output here is a standard PNG-embedded ICO, readable anywhere ICO files are used.