What BMP to QOI conversion does

Convert a BMP image to QOI (Quite OK Image) directly in your browser. QOI is a simple, fast, lossless image format popular in developer and graphics-programming workflows.

How to convert BMP to QOI

1. Choose a BMP file.
2. Select Convert & download.
3. Save the .qoi file from your browser downloads.

Why use this conversion

QOI’s small, easy-to-implement specification makes it popular in tooling and pipelines that specifically read or write QOI, where fast encode/decode matters more than universal support.

Transparency and output quality

QOI supports a full alpha channel, and this tool preserves it from the source. QOI encoding is always lossless — every pixel from the source is reproduced exactly. Resulting file size is typically comparable to PNG.

Privacy and local processing

• Processing occurs locally in the browser.
• Files are not uploaded to Looty Tools for conversion.
• Converted files remain on your device.

Limits and known issues

• Input: BMP (.bmp) only, up to 25.0 MB and 8,192 px per side.
• QOI is a developer-focused format with limited support in mainstream operating systems and browsers — it is intended for tooling and pipelines that read QOI directly.
• Transparency is kept only when the browser decodes a real alpha channel from the source BMP; most BMP files have no transparency.
• Metadata is not preserved in the downloaded file.

Related tools

• BMP to AnyConvert BMP images into multiple common output formats.
• BMP to TIFFConvert BMP images to TIFF for print and archival use.
• BMP to GIFConvert BMP images to a static GIF.

BMP to QOI FAQ

Why convert BMP to QOI?

QOI’s small, easy-to-implement specification makes it popular in tooling and pipelines that specifically read or write QOI, where fast encode/decode matters more than universal support.

Is QOI output lossless?

Yes. QOI encoding is always lossless — every pixel from the source is reproduced exactly.

Does QOI output keep transparency?

Yes. QOI supports a full alpha channel, and this tool preserves it from the source.

Does the source BMP actually have transparency?

Rarely. Most BMP files have no alpha channel at all. When the browser does decode real alpha data from a 32-bit source BMP, it is preserved in output formats that support transparency.

Are my files uploaded?

No. Conversion runs locally in your browser and does not upload your file to Looty Tools servers.

What is validated before conversion?

The file must actually be a BMP — the tool checks the "BM" header bytes, not just the filename or extension, before decoding.