BMP to JPG Converter
BMP is an old uncompressed format that creates massive files. Convert to JPG for a fraction of the file size with no visible quality loss.
Why convert BMP to JPG?
BMP files are a relic from the early days of Windows — Microsoft introduced the format in the 1980s and it's barely changed since. The defining feature is what BMP doesn't do: it stores pixels uncompressed (or with very basic compression), so a single 1080p BMP can easily be 6 MB or more.
JPG is roughly the opposite. It's a modern lossy format from 1992 that uses sophisticated compression specifically designed for photographs. The same image saved as JPG is typically 50 to 200 times smaller than the BMP version, with no visible quality difference on most photos.
If you've ended up with BMP files from old software, screenshots from legacy Windows tools, or scanned documents, converting to JPG is the easiest way to recover storage space and make them shareable.
About BMP
BMP (Bitmap Image File) is a Microsoft Windows format dating back to the 1980s. It stores raw pixel data with little or no compression, which makes it simple but inefficient. BMP files are uncommon today — they mostly show up from older Windows software, certain scanners, and legacy screenshot tools.
About JPG
JPG is the standard format for photographs. It uses lossy compression that's optimized for natural images, producing dramatically smaller files than uncompressed formats while preserving visual quality. Every modern device and platform supports JPG.
BMP vs JPG at a glance
| BMP | JPG | |
|---|---|---|
| Introduced | Mid-1980s, by Microsoft | 1992 |
| Compression | None, in practice | Lossy, tuned for photographs |
| Typical size | Roughly 3 bytes per pixel — enormous | A small fraction of the same image |
| Transparency | Rarely, and poorly supported | No |
| Support | Windows software; awkward elsewhere | Everything, everywhere |
| Best for | Almost nothing today | Photographs, sharing, uploading |
When converting is the right call
- You’ve found BMP files from old Windows software or a legacy scanner and they’re eating storage.
- A file is far too large to email or upload, purely because nothing is compressed.
- Software you need won’t open BMP — outside Windows, plenty won’t.
- You’re digitising an archive and need something a normal person can open.
If the BMP is a screenshot, a diagram, or anything with sharp text and flat colour, JPG is the wrong destination — lossy compression smears hard edges and the artefacts are obvious on lettering. Send it to PNG instead, which is lossless and will still be a fraction of the BMP’s size. JPG is for photographs. On one 3072 × 4080 photo the BMP came to 36,720 KB and the JPG to 1,948 KB — 95% smaller with nothing visible lost, but that result depends on the content being photographic.
Quality and file size
Expect file size to drop by 95% or more. For photos and natural images, the visual quality difference is essentially invisible. For graphics with sharp edges, text, or large flat color areas, JPG compression can introduce subtle artifacts — in those cases, PNG is often a better choice.
Measured on one 12.5 MP phone photo (3072 × 4080, large smooth-gradient sky) saved as BMP: 36,720 KB in, 1,948 KB out — 95% smaller.
How these figures were measured →
Filesmith runs entirely in your browser using WebAssembly. Files are never uploaded to any server — conversion happens locally on your device, instantly and privately.