--- title: "PNG to ICO Converter - Multi-Size Icons | CanDoYa" description: "Convert PNG to ICO online with multiple icon sizes in one file. Preserve transparency, preview every frame, and download privately in your browser." url: https://candoya.com/tools/png-to-ico/ locale: en type: browser-tool --- # Free PNG to ICO Converter Category: Images ## What does a PNG to ICO converter do? A PNG to ICO converter turns one PNG image into a Windows icon or favicon file. It resizes the source into several standard square frames and stores them together in one ICO container. This converter preserves transparency, previews every included size, and performs the entire conversion in your browser. This converter creates a real multi-resolution ICO instead of renaming a PNG. Each selected frame is resized separately with your browser's Canvas API, encoded as PNG, and packed into the icon directory. Use the transparent fit mode for a complete logo, or center crop artwork that should fill every square. ## How to use it 1. **Choose a PNG** - Drop a PNG into the converter, select it from your device, or load the built-in icon example. 2. **Select icon sizes** - Keep the recommended defaults or choose any combination from 16 to 256 pixels. 3. **Set the fit** - Preserve the full image with transparent space or fill each square using a centered crop. 4. **Create and download** - Build the ICO, inspect every generated frame, then download the single multi-size file. ## Who it's for - **Web developers** can package 16, 32, 48, and 256 pixel frames into a single favicon.ico for broad browser compatibility. - **Windows app makers** can create one icon file that lets the operating system choose a suitable resolution for shortcuts and desktop views. - **Designers** can inspect how a transparent logo reads at tiny sizes before handing the ICO to a client or developer. - **Privacy-conscious teams** can convert unreleased brand assets without sending the source image to a remote service. ## Expert note An ICO stores 256 x 256 dimensions as zero in its one-byte width and height fields. This converter writes that special value correctly and embeds lossless PNG data for every selected frame, which keeps transparent edges compact and clean. ## Frequently asked questions ### Is my PNG uploaded during conversion? No. Your browser decodes the PNG, resizes each selected frame on a local Canvas, and assembles the ICO file on your device. The source image and downloaded icon are not uploaded to a conversion server, and no account is required. ### Is this PNG to ICO converter free? Yes. You can create and download ICO files without a subscription, watermark, or sign-up. You may use the converter as often as needed. Each source PNG can be up to 50 MB, 50 megapixels, and 16,384 pixels on either side. ### How many images can one ICO file contain? This converter can place up to seven resolutions in one ICO: 16, 24, 32, 48, 64, 128, and 256 pixels. They are different resized versions of the same source image. Choose at least one size before creating the file. ### Which ICO sizes should I use for a favicon? The default 16, 32, 48, and 256 pixel set is a practical general-purpose choice. Small frames cover tabs and bookmarks, 48 pixels helps desktop contexts, and 256 pixels supports larger and high-density displays. Browsers or Windows can select the closest frame from the same file. ### Does PNG transparency stay transparent in the ICO? Yes. Every resized frame is encoded as a PNG with its alpha channel intact, then embedded inside the ICO container. Transparent space stays transparent. Choose the fit option when you want to preserve the full source without cropping a wide or tall image. ### Should I fit or crop a non-square PNG? Fit is safer for logos because it keeps the complete image and centers it in a transparent square. Center crop fills the icon frame but removes content from the longer sides. Use crop for artwork with a centered subject and fit for marks that must remain complete. ### Can I rename a PNG file to .ico? No. Renaming changes only the filename, not the file structure. An ICO begins with an icon directory that lists each embedded frame and its byte offset. This converter creates that directory and bundles the selected PNG frames into a valid ICO container. ## Related tools - [PNG to JPG](https://candoya.com/tools/png-to-jpg/) - [Image Resizer](https://candoya.com/tools/image-resizer/) - [Image Compressor](https://candoya.com/tools/image-compressor/) - [Image Cropper](https://candoya.com/tools/image-cropper/) - [Image Dimensions Checker](https://candoya.com/tools/image-dimensions-checker/) --- *Markdown edition of , published for AI agents and other automated readers. Index of key pages: .*