BMP (Bitmap) is an uncompressed image format native to Windows. Converting a BMP to PDF embeds the image in a portable document that opens on any platform without requiring Windows-specific viewers.
File size note
BMP files are uncompressed and can be very large. A 2000x1500 pixel BMP at 24-bit colour is around 8.6 MB. The resulting PDF will embed this data; depending on the PDF engine, the output may apply lossless compression that reduces the final file size, but the source image quality is preserved exactly.
On-device processing
The BMP to PDF tool runs entirely in your browser. The bitmap is decoded locally and embedded in the PDF using pdf-lib. No upload occurs.
When to use BMP
BMP files are produced by Windows tools: screenshots from older Windows systems, Paint-edited images, and output from legacy industrial or medical software. If you have a BMP from one of these sources and need to share it as a document, converting to PDF is the most compatible output format.
BMP does not support transparency. If you need to embed a transparent image in a PDF, convert to PNG first. For photographs, JPEG offers better file size at the same visual quality.
Quality
BMP is uncompressed, so the conversion does not degrade the image. The output PDF contains the image at its original pixel dimensions. At 96 DPI (the Windows screen resolution default), a 2000x1500 pixel BMP produces an image approximately 20.8 x 15.6 inches when printed.
File size
BMP files are large by nature. A 1920x1080 pixel 24-bit BMP is approximately 5.9 MB. The PDF will embed the image data; PDF engines typically apply lossless compression that can reduce the output file size to 40-70% of the original BMP size while preserving every pixel exactly.