Convert BMP to JPG — Free, Fast & Private
BMP (Bitmap) is one of the oldest image formats, used by Windows since the early 1990s. BMP files are uncompressed, which means a single screenshot or scanned document can be 10-50MB. Converting to JPEG typically reduces file size by 90-95% while keeping the image looking identical at normal viewing sizes.
MiniPx converts BMP to JPG directly in your browser using the Canvas API. Unlike online converters such as Zamzar, CloudConvert, or Convertio that upload your files to remote servers, MiniPx processes everything client-side. Your bitmap files never leave your computer or phone — making it safe for screenshots containing sensitive information, scanned documents, and business files.
BMP files are common in specific workflows: Windows screenshots saved via older tools, scanned documents from office scanners, medical imaging exports, legacy software output, and CAD program exports. If you receive BMP files regularly, batch converting them to JPEG saves enormous amounts of storage space and makes them easy to email or upload.
The Smart compression preset works best for most BMP conversions. Since BMP files contain uncompressed pixel data, the conversion to JPEG at quality 65% produces files that are visually identical to the original at normal viewing sizes. For scanned text documents, use the Gentle preset (quality 82%) to preserve text sharpness.
MiniPx supports batch processing — drag in a folder of BMP files and convert them all to JPEG at once. Download individually or as a ZIP. Each file shows the before and after size so you can verify the dramatic size reduction.
Why BMP files are so large
BMP stores every pixel as raw colour data without any compression. A 1920x1080 screenshot in BMP format is approximately 6MB (1920 x 1080 x 3 bytes per pixel). The same image as a JPEG is typically 200-400KB — a 15-30x reduction. This is because JPEG uses perceptual compression to discard visual data the human eye cannot distinguish.
BMP to JPG for email and web
Most email providers, websites, and social media platforms do not accept BMP uploads. Converting to JPEG makes your images compatible with every platform. Gmail, Outlook, WordPress, Facebook, Instagram — they all accept JPEG. BMP files also load slowly on web pages because browsers must download the entire uncompressed file before displaying it. JPEG files load progressively and are much faster.