Free online ICO to WEBP converter

What the ICO format is

ICO is the Windows icon container format used for application icons, shortcuts, folders, and website favicons. One ICO file can contain multiple raster images at different dimensions and color depths, often including 16×16, 32×32, 48×48, and 256×256 pixel versions. Some ICO files contain PNG-compressed images internally.

Windows applications, icon editors, favicon tools, and design software create ICO files. Because an ICO can hold several versions of an icon, conversion requires selecting the embedded size that matches the intended WEBP dimensions.

What the WEBP format is

WEBP is an image format developed by Google for web delivery and general raster-image storage. It supports lossy and lossless compression, an alpha channel for transparency, and animation. A normal ICO conversion produces one static WEBP image rather than an animated file.

Lossy WEBP can be substantially smaller than PNG for photographic or complex artwork. Lossless WEBP preserves pixel data and is better suited to icons with sharp edges, text, or limited-color graphics, although its file may not be smaller than the original.

How to convert the file online

101convert.com can convert ICO files to WEBP for free without installing software:

1. Open the ICO to WEBP converter on 101convert.com.
2. Upload the ICO file.
3. Choose WEBP as the output format and start the conversion.
4. Download the result and check its dimensions, transparency, and appearance.

If the ICO contains multiple sizes, verify that the service selected the required embedded image. The output is normally one WEBP frame, not a new multi-size icon container.

How to convert with ImageMagick

ImageMagick is suitable for local processing, scripting, and batch workflows. First inspect the embedded images:

magick identify input.ico

The output lists the individual images and their indexes. Convert a selected frame by appending its index to the filename:

magick "input.ico[2]" -quality 90 output.webp

Replace 2 with the index of the required size. If the ICO has only one image, use:

magick input.ico output.webp

For lossless WEBP output, use ImageMagick's WEBP setting:

magick "input.ico[2]" -define webp:lossless=true output.webp

Repeat the command for each source file or place it in a script. Select the frame explicitly instead of assuming that automatic selection will choose the largest or most suitable icon.

How to convert with a desktop editor

GIMP can open ICO files and export WEBP when its format support is available. Open the file with File → Open; if the import dialog exposes multiple icon images, select the required size. Then use File → Export As, give the file a .webp extension, choose the WEBP export settings, and enable lossless output when preserving hard-edged artwork matters.

Quality and compatibility limits

• The output contains one image. It does not preserve the complete set of sizes stored in the ICO. Export the largest suitable source frame; enlarging a small frame produces blur.
• Compression affects edges. Use lossless WEBP for one-pixel lines, text, and flat-color icons. For lossy output, a quality value around 85–95 is a reasonable starting range, but inspect the result for ringing and halos around transparent areas.
• Transparency depends on the source. ICO files may use a legacy transparency mask or a full alpha channel. Conversion software normally interprets the mask, but transparent regions should still be checked against a contrasting background.
• WEBP is not universally accepted. Current browsers and image applications generally support it, but older software, embedded systems, and icon APIs may require PNG or ICO instead.
• WEBP is not a replacement for every favicon or Windows icon. Keep ICO when an application, operating system interface, or icon package specifically requires the ICO container and its multiple embedded resolutions.