What is the BMP format?

BMP, short for Bitmap, is Windows' native image format and one of the oldest raster formats in existence. It stores images pixel by pixel with no compression at all, which means every single detail of your original image is preserved exactly. Because the format is so simple and universal, virtually every image viewer, editor, and operating system can open a BMP file without any special software.

When should you use BMP?

BMP is the right choice when you need raw, untouched pixel data — for example, Windows desktop wallpapers, textures for older software, and legacy applications that only accept uncompressed bitmaps. It is also useful in programming and embedded projects where a simple, easy-to-parse format matters more than file size. For sharing photos online or by email, though, BMP files are far too large — JPEG or PNG will serve you much better.

Key benefits of converting to BMP

The standout benefit of BMP is absolute fidelity: with zero compression, there is no quality loss of any kind, ever. Files open instantly on any Windows system and in nearly every image editor ever made. BMP is also completely free of patents and licensing concerns, and its straightforward structure makes it a favorite for developers who need to read or write image data directly in code.

How to convert your images to BMP

FlowTool converts your images to BMP in seconds, completely free. Click Browse Files or drag up to 10 images into the upload area, then press Convert. The conversion happens right in your browser, and your pixel-perfect BMP files are ready to download immediately — no signup, no watermark, no software to install.

Tips for the best results

Be aware that BMP files are large — a single photo can easily reach tens of megabytes — so they are best kept for local use rather than uploading to websites. If you need a smaller file for sharing, convert a copy to JPEG or PNG while keeping the BMP as your untouched master. For crisp wallpapers, convert from the highest-resolution source you have so every pixel stays sharp on big screens.