BMP to JPG Converter
Convert BMP (Windows Bitmap, 1990) to JPG (Joint Photographic Experts Group, 1992) entirely in your browser. Output files are dramatically smaller — typically around 96% the size for ordinary photographs. Files never leave the tab — there is no upload.
Which formats are supported?
Inputs: PNG, JPEG, WEBP, AVIF, GIF, BMP, ICO, TIFF (Safari) and HEIC/HEIF (via libheif WASM, loaded on demand). Outputs: PNG, JPEG, WEBP, AVIF — each with an optional WASM encoder variant in the dropdown (mozjpeg, oxipng, libwebp, libavif) for tighter compression or consistent output across browsers. Vendor camera RAW formats (CR2/CR3/NEF/ARW/DNG/...), PSD, EPS, TGA, XCF and ICNS are still rejected — those need format-specific decoders we haven't shipped yet.
BMP stores pixels exactly. JPG discards detail you cannot see — sharper colour transitions and high-frequency texture — to dramatically reduce file size. The default quality (92) is the sweet spot for photographs; drop it lower if you need very small files, raise it for art assets.
BMP supports an alpha channel; JPG does not. Transparent pixels in the source are flattened onto white during conversion. If you need to preserve transparency, pick PNG, WEBP or AVIF as the target instead.
JPG is the natural choice for Photographs, Screenshots of natural images, and Anywhere you need 100% compatibility. It is a poor fit for Logos, line art, screenshots of text, Images that need transparency, and Images that will be re-edited many times. Every browser, every OS, every camera since 1993.
BMP: what it is
BMP usually stores raw uncompressed pixel data plus a header. A 1920×1080 photo is roughly 6 MB as BMP vs 200–500 KB as JPEG.
Still common as the export format from legacy Windows scanners, GIS software and some embedded device imagers.
JPG: what it is
DCT-based lossy compression. Every save throws away high-frequency detail; repeated re-saves visibly degrade the image (generation loss).
Has no alpha channel, so 'transparent JPG' is a contradiction in terms — converters fill transparent pixels with white.
At a glance
- Typical size change
- ~96% smaller
- Transparency preserved
- No — JPG has no alpha, transparent pixels are flattened to white
- Compression
- BMP (lossless) → JPG ( lossy)
- JPG browser support
- Every browser, every OS, every camera since 1993.
Frequently asked questions
Is the converted JPG smaller than the original BMP?
On a typical photograph, dramatically smaller — typically around 96% the size. Synthetic graphics (logos, screenshots) may behave very differently — try a single file first if size matters.
Will my BMP be uploaded to convert it?
No. The conversion runs inside the browser tab using WebAssembly. Your file is never sent over the network — drop it, convert it, download it, all on your machine.
What happens to transparency when converting BMP to JPG?
JPG has no alpha channel, so transparent pixels are flattened to white. If you need to keep transparency, convert to PNG, WEBP or AVIF instead.