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.

Does BMP support transparency?

Standard BMP files do not have an alpha channel for transparency. Transparent areas from the ICO will be rendered on a white background in the exported BMP file.

What BMP format does this tool output?

The tool outputs a 24-bit uncompressed BMP (DIB header format), which is compatible with virtually all image editors and Windows applications.

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 BMP?

ICO is a Windows container format that bundles multiple image sizes into one file. BMP is an uncompressed raster format that stores a single image. BMP files are typically larger but universally compatible with Windows applications.

Why would I use BMP instead of PNG or WebP?

BMP is required by some legacy Windows applications, resource editors, and embedded systems that do not support modern formats. If you need maximum compatibility with older software, BMP is the right choice.

ICO to BMP Converter

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

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

Upload ICO File

Click or drag an ICO file here

ICO / favicon files — converted to BMP in your browser

BMP 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, and download a BMP 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.
A preview of the selected size is shown with a checkerboard background to visualize transparency.
Click "Download BMP" to save the chosen resolution as a BMP file.

Use cases

Convert a favicon to BMP for use in legacy Windows applications that require BMP format.
Extract a specific resolution from a multi-size ICO as a BMP for editing in Paint or older tools.
Prepare icon assets for embedded systems or older software that only accept BMP files.
Recover a usable BMP image from an ICO when no original BMP source is available.
Convert Windows application icons to BMP for compatibility with older design tools.
Export favicons as BMP for use in Windows desktop shortcut customization.
Preview all sizes embedded inside an ICO before deciding which resolution to export.
Convert ICO files to BMP for use in resource editors and legacy Win32 applications.

Frequently Asked Questions

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