JPG to BMP Converter Online
Produce an uncompressed 24-bit bitmap for legacy Windows and industrial software that will not read compressed formats.
Convert to
Drop images here
JPG, PNG, WebP, BMP · Multiple files supported
How to Convert JPG to BMP?
Nothing is uploaded. The jpg file is decoded and re-encoded as bmp inside this tab.
Add your JPG files
Drag them in or use Choose Files. Batches are fine.
BMP is already selected
BMP is uncompressed, so the quality slider has no effect at all. Output size is fixed by the image dimensions alone.
Convert and download
Everything runs locally, so the bmp file saves straight to your device.
Why Convert JPG to BMP?
BMP (Bitmap) is an uncompressed format used by legacy Windows applications, some industrial software, and certain print workflows. Convert JPG to BMP when a specific application requires uncompressed input and does not accept compressed formats.
About JPG
JPG uses lossy compression to produce small, web-friendly image files. It is the standard format for digital photography and the default output of most cameras and mobile devices.
About BMP
BMP (Bitmap) stores image data uncompressed, one pixel at a time. Every pixel is preserved at full fidelity. BMP files are very large compared to JPG or PNG, a 1920×1080 BMP can exceed 6 MB, but some legacy tools require them.
What Happens to Transparency
Not applicable in either direction. JPG has no alpha channel and the 24-bit BMP this tool writes has none either, so nothing is lost in the move.
File Size: What to Expect
BMP file size depends only on dimensions, never on image content. A 1920x1080 image is always 6,220,854 bytes, about 5.93 MB, as a 24-bit BMP, whether it is a detailed photograph or a blank white rectangle. The rule of thumb is width x height x 3 bytes plus 54 bytes of headers.
When Not to Convert JPG to BMP
Never use BMP for the web, for email attachments, or for anything you intend to share. It exists for legacy Windows software, industrial and laboratory equipment, and a handful of print workflows. For every other purpose JPG, PNG or WebP is dramatically smaller and just as readable.
How the Conversion Works
This tool writes a genuine 24-bit BI_RGB bitmap: a 14-byte file header, a 40-byte info header, then bottom-up BGR pixel rows padded to a 4-byte boundary. No compression is applied at any stage.
Other JPG and BMP Conversions
Every pairing runs on the same browser-based converter.
Need a pairing that is not listed? The full image converter covers every combination of JPG, PNG, WebP and BMP.
More Image Tools
Frequently Asked Questions
Common questions about converting JPG to BMP online.
Why convert JPG to BMP?
BMP (Bitmap) is an uncompressed format used by legacy Windows applications, some industrial software, and certain print workflows. Convert JPG to BMP when a specific application requires uncompressed input and does not accept compressed formats.
What happens to transparency when converting JPG to BMP?
Not applicable in either direction. JPG has no alpha channel and the 24-bit BMP this tool writes has none either, so nothing is lost in the move.
How much will the file size change?
BMP file size depends only on dimensions, never on image content. A 1920x1080 image is always 6,220,854 bytes, about 5.93 MB, as a 24-bit BMP, whether it is a detailed photograph or a blank white rectangle. The rule of thumb is width x height x 3 bytes plus 54 bytes of headers.
When should I not convert JPG to BMP?
Never use BMP for the web, for email attachments, or for anything you intend to share. It exists for legacy Windows software, industrial and laboratory equipment, and a handful of print workflows. For every other purpose JPG, PNG or WebP is dramatically smaller and just as readable.
Is the output a real uncompressed BMP?
Yes. It is a standard 24-bit BI_RGB bitmap written byte by byte, not a PNG with the extension changed. Any application that reads BMP will open it.
Why is the BMP so much larger than the JPG?
Because BMP applies no compression at all. Every pixel occupies three bytes on disk. A JPG of the same image might be 2% of that size.
Are my JPG images uploaded to a server?
No. The conversion runs entirely in your browser. Your JPG files never leave your device and are never sent anywhere.