Does BMP support transparency?

BMP (Bitmap) is Microsoft's original raster image format, dating back to Windows 1.0. It stores image data uncompressed by default - Every pixel is written to the file directly with no size-reduction algorithm applied. This means BMP files are exactly the pixel dimensions × bit depth in size, typically 3–10× larger than an equivalent JPEG.

BMP's lack of compression is both its weakness and its strength. There is zero decoding overhead, making BMP trivial to read and write in embedded systems, drivers, and applications that need raw pixel data without the complexity of a codec. It is also the required input for some older Windows software, screensaver tools, and certain industrial control systems.

For virtually all modern use cases - Web, email, sharing, archiving - PNG is a strictly better alternative to BMP: it is lossless, compresses to 30–50% smaller files, and is universally supported. Choose BMP only when a specific application or workflow explicitly requires it.

Reasons to convert JPG to BMP usually come down to compatibility, file-size, or specific feature requirements. Common situations:

• An app or platform only accepts BMP uploads.
• You need a feature unique to BMP (e.g. transparency, vector scaling, animation, multi-page pages, etc.) that JPG doesn't provide.
• You're optimising file size — modern formats often produce smaller files than the older format you started with.
• You need a single archival format across a project so files behave consistently in the same viewer.

1. Open the JPG → BMP tool on jpg.now.
2. Drag your JPG file onto the drop zone, or click Select files. You can drop a whole folder of files at once.
3. The output is fixed to BMP. If the format supports extra options (page size, transparency background, quality, EXIF stripping), tweak them in the right-hand panel.
4. Click Convert. The job runs on our server and finishes in a few seconds for typical photos.
5. Download the result. Files stay in storage for 24 hours and are then permanently deleted.

The entire flow is free for the first 10 jobs per day with no signup required. A free account doubles that quota; a premium plan removes the limit entirely.

• Be aware of the large file size: a 12 MP photo becomes roughly 36 MB as an uncompressed 24-bit BMP. Ensure you have adequate storage and transfer bandwidth.
• BMP files do not support transparency. If your workflow requires transparency, use PNG instead.
• Most modern applications that accept BMP also accept PNG - Confirm whether BMP is genuinely required before converting.
• 24-bit BMP (default) stores the full RGB colour range. 8-bit BMP reduces to a 256-colour palette - Use 24-bit unless file size is critical.