twineconvert

free · in-browser · no upload

ICO to WebP
Converter

Drop your ICO file. We'll convert it to WebP right here in your browser, your file never leaves your device.

or drop your file

Select your file here to get started

or drop your file here.

Accepts .ico

nothing uploaded no file size cap no signup

How it works

Three steps. No upload, no signup.

  1. 1

    Drop your file

    Click the dropzone above or drag a ICO from your desktop. Files of any size, there's no upload, so there's no upload limit.

  2. 2

    Convert in your browser

    The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.

  3. 3

    Download

    Get your WebP the moment the conversion finishes. Convert another, or close the tab.

Files stay on your device

Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.

No file size limit

Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.

Free, no signup, no ads on conversions

No account required. No watermark on the output. No queue. Drop a file, get a converted file.

Why convert ICO → WebP

What this conversion is actually for

WebP is the modern web image format: 25 to 35 percent smaller than PNG or JPEG at the same quality, with alpha transparency support. This converts ICO images to WebP entirely in your browser using the Canvas API, so the file never leaves your device. Transparency in the source is preserved.

A real example

You have a ICO image and a tool, site, or workflow that needs WebP. Drop the ICO here and download the WebP in one step, no upload.

Troubleshooting

The WebP looks slightly different in an old browser.

WebP is supported in all current browsers; very old versions may not render it. The file itself is a standard lossy WebP at quality 0.9.

Formats involved

About ICO and WebP

ICO, Icon

ICO is Microsoft's icon format, a single file containing the same icon at multiple sizes (typically 16, 32, 48, 64, 128, 256 pixels). Browsers use the favicon at the top of every tab. Modern websites can use PNG favicons too, but ICO remains the universally-supported choice especially for older browsers and Windows desktop integration.

How to open

Browsers and Windows recognize ICO natively. macOS treats them as standard images. Modern image editors read multi-resolution ICOs; some older tools only see the first size.

Full ICO format guide →
WebP, Web Picture

WebP is Google's image format, designed in 2010 specifically for the web. It compresses 25-35% smaller than JPG at equivalent quality, supports transparency like PNG, and supports animation like GIF. Browser support is universal as of 2020 (Safari was the last holdout). The main reason most images aren't already WebP: legacy software (older Office versions, some email clients) doesn't open it.

How to open

All modern browsers display WebP natively. Photoshop added native support in version 23 (2021); earlier versions need a plugin. macOS Preview reads WebP since macOS Monterey. On Windows, the Photos app supports it; older viewers may not.

Full WebP format guide →

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FAQ

Common questions

Is this ICO → WebP converter really free?

Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.

Where does my file go when I convert it?

Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.

What's the maximum file size?

Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.

Why convert ICO to WebP?

Browser favicons and Windows desktop icons. Modern web imagery where smaller files load faster. The most common reason to convert is compatibility, WebP works in places where ICO doesn't, or vice versa.

How do I open a ICO file in the first place?

Browsers and Windows recognize ICO natively. macOS treats them as standard images. Modern image editors read multi-resolution ICOs; some older tools only see the first size.

Does this work offline?

Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.

Can I convert multiple files at once?

Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.