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The ICO format exists for exactly one job: carrying multiple sizes of the same icon in a single file so that the operating system or browser can pick the right resolution for the context without scaling artifacts. A favicon.ico at your site root serves 16×16 in browser tabs, 32×32 in taskbar thumbnails, and up to 256×256 for Windows pinned shortcuts — all from one file, picked automatically. Enhydra RPO takes whatever you have — a photo, a logo JPG, a vector rasterization, a PSD export — and builds a properly structured multi-size ICO from it.
Each output ICO file bundles six embedded sizes: 16, 32, 48, 64, 128, and 256 px. The source image is downscaled to generate each embedded size; a larger and sharper source produces better results at the small sizes that matter most. Transparency from sources with alpha channels (PNG, WebP, AVIF) is preserved inside the ICO. EXIF data is stripped — it has no meaningful use in an icon file.
Almost any image format works as a source, but some choices give better results:
The output ICO embeds the following pixel-square sizes:
Embedding all six means the OS or browser never has to scale one size to fit another context, which is what produces blurry favicons on mixed-DPI displays.
Place favicon.ico at the root of your web server — https://example.com/favicon.ico — and most browsers will find it automatically without any HTML reference required. For complete control and to cover Apple Touch Icons, add explicit <link rel="icon"> declarations in your page <head>, but the root-path ICO is the universal baseline that works even when HTML is not under your control (for example, in hosted platforms).
You can also batch-generate ICO files for multiple projects or clients in one run: upload up to 200 source images, and each produces its own ICO file in the ZIP output.
At least 256×256 px, and preferably 512×512 or larger. The converter scales down from the source; a larger source means more detail at 16 and 32 px where the icon is most scrutinized.
Yes. Each embedded size in the ICO supports alpha transparency. Sources with an alpha channel — PNG, WebP, AVIF — produce ICO files where all six embedded sizes have transparent backgrounds.
Yes. SVG is accepted as a source format. It is rasterized at high resolution first, then downscaled to generate the six embedded ICO sizes, giving clean crisp edges typical of vector-derived icons.
Yes. Upload up to 200 source images in one run; each produces its own ICO file, and all are packaged in a single ZIP download.
Non-square sources are fit into a square canvas for each embedded size. For best results, crop or pad your source to a square before converting — otherwise the icon will have letterboxing or unwanted cropping.