Convert JPG to BMP Online
Convert JPEG images to uncompressed BMP format online — no upload, no software required.
BMP (Bitmap) is an uncompressed raster image format native to Windows. Converting a JPG to BMP produces a file with no compression — every pixel is stored at full bit depth. BMP files are significantly larger than JPEG but are supported by virtually all Windows applications and some legacy systems that do not accept compressed formats. Dockitt converts your JPG to BMP directly in your browser using the Canvas API.
How to use
- Click 'Choose JPG' and select the JPEG image you want to convert.
- Click 'Convert to BMP' and wait while the image is processed.
- Download the BMP file.
FAQ
Why would I need a BMP file instead of JPG?
BMP is required by some legacy Windows applications, older hardware devices, and certain software tools that do not accept compressed formats. BMP is also useful in workflows where images are processed programmatically and no decompression overhead is acceptable, or where perfect pixel fidelity is required by the receiving system.
Will the BMP file be much larger than the JPG?
Yes, significantly larger. BMP stores every pixel without compression. A typical JPG image of a few hundred kilobytes can produce a BMP file that is ten to fifty times larger. Make sure you have enough disk space before converting large JPG files.
Does converting JPG to BMP improve image quality?
No. The JPEG compression artefacts present in the source image are carried through to the BMP output. BMP simply stops any further quality degradation by storing the current pixel values without additional compression. It does not restore quality that was lost when the JPG was originally created.
Is the BMP output compatible with all Windows programs?
BMP is the native Windows bitmap format and is supported by virtually all Windows applications including Paint, Word, older versions of Photoshop, and most image processing software. Some browsers and web applications may not support BMP for display, but as a file format for desktop use it is universally compatible on Windows.
Why is the conversion slow for large images?
BMP files are uncompressed, which means the browser has to process and write out every pixel individually. Large images produce very large BMP files, which takes more time and memory in the browser. This is a characteristic of the format rather than a limitation of the tool.
Is the conversion done in my browser or on a server?
The conversion runs entirely in your browser using the Canvas API. Your image is never uploaded to any server.