BMP is one of the oldest image formats — developed by Microsoft in the 1980s for Windows. It stores images as raw pixel data with no compression whatsoever. That means perfect image quality, but file sizes that are far larger than any other common format.
A photograph stored as a BMP can be 10 to 30 times larger than the same photograph stored as a JPG with no perceptible difference in how it looks on screen. Converting BMP to JPG is one of the most straightforward size reductions in digital imaging.
How to convert BMP to JPG for free
Open Filero's free BMP to JPG tool and follow these steps:
- Upload your .bmp file.
- The conversion runs automatically in your browser.
- Download the converted .jpg file.
Nothing is uploaded to a server. The conversion happens entirely in your browser using the built-in canvas API.
Why BMP files are so large
A 24-bit BMP image stores three bytes of colour information for every single pixel — one byte each for red, green, and blue. A 1920 by 1080 pixel image therefore requires 1920 x 1080 x 3 bytes of raw data, which is about 6 MB before any file overhead. No compression is applied.
JPG uses a compression algorithm that exploits the way human vision works — it is more sensitive to brightness than to colour, and more sensitive to large shapes than to fine detail. By reducing information in the areas where the eye is least sensitive, JPG achieves massive file size reductions that are largely invisible in normal viewing.
The same 1920 x 1080 photograph that is 6 MB as a BMP will typically be 300 to 700 KB as a JPG at standard quality — a reduction of 90% or more.
Where do BMP files still come from?
Windows screenshots. Older versions of Windows would save screenshots as BMP files by default. If you have screenshots from old Windows XP or Windows 7 systems, they may be in BMP format.
Paint saves. Microsoft Paint defaults to BMP when saving. Many users who capture and annotate screenshots in Paint end up with BMP files without realising it.
Old scanner output. Some older scanners and scanning software saved to BMP. If you are working with scanned archives from the early 2000s, BMP files are common.
Fax and document systems. Certain legacy document management systems and fax machines output BMP.
Other ways to convert BMP to JPG
On Windows:Open the BMP in Paint, go to File > Save As > JPEG Picture. This is the fastest method for a single file. For bulk conversion, IrfanView (free) can batch-convert entire folders.
On Mac:Open in Preview, go to File > Export, and choose JPEG from the format dropdown. Preview also handles batch conversions — select multiple files in Finder, open them in Preview, then use File > Export Selected Images.
On iPhone or Android: BMP is not natively supported in iOS or Android Photos apps. Use Filero in your mobile browser for the most reliable conversion.
Frequently asked questions
Does converting BMP to JPG reduce quality?
For photographs and detailed images, a JPG at 85-90% quality is visually identical to the BMP in normal use. You would need to zoom in to 200% or more and look at high-contrast edges to see any difference. For images with text, sharp lines, or flat areas of colour, JPG compression can introduce subtle artifacts — for those, PNG is a better target format.
Can I convert BMP to PNG instead?
Yes — PNG is a lossless format that supports all the same image types as BMP without any quality loss. It is particularly well-suited for screenshots, diagrams, and images with text. PNG files will be larger than JPG but significantly smaller than BMP. Use Filero's JPG to PNG tool or save as PNG from Paint or Preview.
Is BMP still used professionally?
Rarely. In professional contexts, TIFF has replaced BMP as the lossless archival format of choice because TIFF supports more colour depths, metadata, and compression options while BMP has none. BMP survives mainly in legacy systems and as Paint's default format.
Can I convert multiple BMP files at once?
The Filero tool handles one file at a time. For batch conversion, use IrfanView on Windows or Preview's batch export on Mac — both handle multiple BMP files efficiently.
Ready to try it?
Use Filero's free BMP to JPG tool. No account needed, works on any device.
Open BMP to JPG