Are my ICO files uploaded to a server?

No. The entire conversion runs inside your browser using the HTML5 Canvas API and JavaScript. Your ICO file never leaves your device.

What quality setting should I use?

A quality of 85–90 gives an excellent balance between file size and visual quality. For icons with flat colors or transparency, 80 is usually indistinguishable from lossless. Set quality to 100 for the closest to lossless output.

Does WebP support transparency from ICO files?

Yes. WebP supports an alpha channel, and the Canvas API preserves alpha when drawing ICO frames. Your transparent icon areas will remain transparent in the downloaded WebP.

How many sizes can an ICO file contain?

An ICO file can embed any number of images at different sizes. Common favicon sizes are 16×16, 32×32, 48×48, and 256×256 pixels. Windows application icons may also include 24×24, 64×64, and 128×128.

What is the difference between ICO and WebP?

ICO is a Windows container format that bundles multiple image sizes into one file. WebP is a modern image format developed by Google that offers superior compression — both lossy and lossless — compared to PNG and JPEG, while supporting transparency.

Why is my browser not generating a WebP?

All modern browsers (Chrome, Edge, Firefox 96+, Safari 16+) support WebP encoding via the Canvas API. If your browser returns a PNG instead, it may not support WebP canvas export — upgrade to the latest browser version.

ICO to WebP Converter

Name: ICO to WebP Converter
Availability: InStock
Author: Nham Vu

Upload an ICO file, pick a size, adjust quality, and download a WebP image — entirely in your browser, no upload needed.

Upload ICO File

Click or drag an ICO file here

ICO / favicon files — converted to WebP in your browser

WebP Preview

Upload an ICO to see the embedded sizes

Conversion happens instantly, entirely in your browser

Downloaded!

Summary

Upload an ICO file, pick a size, adjust quality, and download a WebP image — entirely in your browser, no upload needed.

How it works

Upload any ICO or favicon file by clicking the upload area or dragging it in.
The browser reads the ICO binary and decodes each embedded image size using the Canvas API.
A grid of available sizes appears — click any tile to select that resolution.
Use the quality slider to set the WebP compression level (1–100).
Click "Download WebP" to save the chosen resolution as a WebP file.

Use cases

Convert a favicon to WebP for use in modern web projects that prefer WebP.
Extract a high-resolution WebP from a multi-size ICO for design assets.
Prepare icon assets for web manifests or PWAs that accept WebP format.
Recover a usable image from an ICO file when no source WebP is available.
Convert Windows application icons to WebP for cross-platform use.
Reduce icon file size compared to PNG by using WebP compression.
Preview all sizes embedded inside an ICO before deciding which resolution to export.
Convert ICO favicons to WebP for email signatures or presentations.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu