Yes, with no account, no watermark and no per-file limit.

Are my files uploaded?

No. The conversion runs entirely in your browser and the file never leaves your device.

Convert BMP to ICO

ICO packages an image for use as a Windows or browser icon. Everything happens locally: BMP files are decoded by your browser and written back out as ICO without ever touching a server.

Checking your browser's codec support…

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Drop your BMP files here or

Batch supported · files never leave your device

Output format Quality 92%

What is BMP?

A format that has shipped with Windows since 1990. Uncompressed and predictable, which is why industrial and legacy software still emits it.

Why convert BMP to ICO?

ICO packages an image for use as a Windows or browser icon.

BMP files are typically several times larger than a PNG of the same image, and browsers treat them inconsistently on the web.

How this converter handles BMP

We decode 24-bit and 32-bit BI_RGB bitmaps in both bottom-up and top-down orientation.

Why the conversion happens on your device

This page is a static file. There is no upload endpoint, no queue and no server-side conversion step — the work is done by JavaScript running in your own browser. That has three practical consequences:

Nothing is transmitted. Open your browser's network panel and confirm it yourself.
No file size limit. Server-based converters cap uploads and throttle repeat use. Your machine has no such quota.
No queue. Conversion starts immediately and runs at local speed.

Frequently asked questions

Is this really free?: Yes, with no account, no watermark and no per-file limit. There is no server cost to recover because no server is involved.
Are my files uploaded?: No. The page has no backend to upload to. You can verify this in your browser's developer tools, or by loading the page and disconnecting from the internet before converting.
Does converting BMP to ICO lose quality?: No. ICO is lossless, so the pixels are preserved exactly. The file may be larger or smaller than the original, but it will look identical.
Can I convert many files at once?: Yes — drop a batch and they are processed one after another.
What if my browser cannot decode BMP?: For formats browsers do not support natively (TGA, QOI, PPM/PGM/PBM, farbfeld, BMP, ICO) FormatAtlas ships its own decoder, so support does not depend on your browser version.