Are my images uploaded to a server?

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

What image formats can I upload?

WebP files are accepted. All modern browsers natively support decoding WebP, so the conversion is fast and reliable.

Why does the ICO contain multiple sizes?

Browsers and operating systems pick the best resolution from available sizes. Including 16px (browser tab), 32px (taskbar), and 48px (desktop shortcut) ensures sharp rendering in common environments.

Can I choose which sizes to include?

Yes. Use the size checkboxes before downloading. At least one size must be selected. Including all three sizes is recommended for maximum compatibility.

Will the icon look sharp at 16x16?

The tool uses bilinear-like downscaling via the browser's Canvas API. For best results at small sizes, use a simple logo or icon with clear shapes rather than a detailed photograph.

Is the downloaded file a valid .ico?

Yes. The file follows the standard ICO binary format (ICONDIR + ICONDIRENTRY headers + PNG-compressed image data per size) and can be used directly as a favicon.ico or Windows icon.

Does WebP transparency (alpha) carry over to the ICO?

Yes. WebP images with transparent backgrounds are preserved in the ICO file. The canvas draws without a white fill when the source is WebP, so transparent areas remain transparent in all icon sizes.

WebP to ICO Converter

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

Upload a WebP image and download a multi-size .ico favicon instantly — converted entirely inside your browser.

Upload WebP Image

Click or drag a WebP image here

WebP files supported

Icon Sizes to Include

All three sizes are recommended for maximum browser and OS compatibility.

16 × 16 px Browser tab 32 × 32 px Taskbar 48 × 48 px Desktop shortcut

Icon Preview

Upload a WebP image to see icon previews

Each size is shown at actual pixel dimensions

Downloaded!

Summary

Upload a WebP image and download a multi-size .ico favicon instantly — converted entirely inside your browser.

How it works

Select or drag a WebP image onto the upload area.
Choose which icon sizes to include (16, 32, or 48 px).
The tool draws each size onto a hidden Canvas element in your browser.
Raw PNG-compressed pixel data for each size is packed into a valid ICO binary.
A preview grid shows each size at actual pixels before you download.
Click "Download ICO" to save the favicon.ico file to your device.

Use cases

Create a favicon.ico for a website from a WebP logo or brand image.
Generate Windows application icons from a WebP graphic.
Produce multi-resolution ICO files without installing software.
Convert a high-resolution WebP logo to a compact .ico for browser tabs.
Prepare favicons for static site generators that require an ICO file.
Quickly test how a WebP logo looks at small icon sizes before finalizing it.
Replace a missing favicon without leaving the browser.
Process brand images privately without uploading to a third-party service.

Frequently Asked Questions

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Last updated: 2026-05-29 · Reviewed by Nham Vu