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BMP to JPG Converter
Quick answer
Convert an uncompressed BMP into a JPEG that is a fraction of the size. BMP still turns up from legacy scanners, old Windows screenshot tools, and some industrial hardware, and the files it produces are far larger than most people expect.
What the bmp to jpg converter does
BMP, the Windows bitmap format, generally stores images with no compression at all: every pixel colour value is written out in full, one after another. A 1920 by 1080 image at 24-bit colour comes out to roughly 6 megabytes as a BMP, for a photo that would fit in a few hundred kilobytes as a JPEG. Nothing is wrong with a BMP that size; it is simply what an uncompressed format costs at that resolution.
JPEG typically brings that same image down 10 to 20 times smaller at a quality setting most people cannot tell apart from the original, because JPEG spends its compression budget on discarding detail the eye does not register rather than storing every value verbatim.
BMP shows up less from choice these days and more from legacy sources: older flatbed scanner software that defaults to it, industrial or scientific imaging equipment that has not been updated in years, and some very old screen-capture tools on Windows. If something upstream of you is producing BMP files, converting them to JPEG before storing or sharing them is almost always the right call.
How to use it
Upload the BMP
Drag or browse. Even single files can be surprisingly large, so give the upload a moment.
Set JPEG quality
80 to 85 is a strong starting point; BMP has no existing compression artefacts to worry about compounding.
Compare the file size
Expect a reduction of roughly 90 to 95 percent, which is normal for uncompressed source material.
Download the JPEG
A far smaller file, ready for email, upload, or storage.
Your images never leave your device
The encode happens in your browser tab, which is worth knowing when the BMP came off a legacy medical imaging device or an old flatbed scanner digitising a paper legal document. The file never has to pass through an external converter just because the equipment that produced it predates modern formats.
- No file is ever uploaded to a server
- Works offline after the first visit
- No account, no watermark, no limits
Format and quality tips
There is rarely a reason to keep a BMP long term
Unless a specific piece of legacy software requires BMP input, converting to JPEG for storage or sharing loses essentially no visible quality while cutting the file down by an order of magnitude.
Batch old scan folders in one pass
If a scanner has been dumping BMP files into a folder for years, running the whole folder through at once and keeping the JPEGs will free up a large amount of storage with very little visible trade-off.
Frequently asked questions
Why is my BMP file so much bigger than a JPEG of the same photo?
BMP typically stores every pixel with no compression at all, while JPEG discards detail the eye barely notices. A 1920 by 1080 24-bit BMP runs around 6 megabytes; the same image as JPEG is usually a few hundred kilobytes.
Do I lose quality converting BMP to JPG?
Yes, JPEG is lossy, so some detail is discarded. At quality 80 or above the difference from an uncompressed BMP is rarely visible to the eye.
Why does my old scanner save files as BMP?
Many legacy scanner drivers default to BMP because it requires no compression logic to implement, which made sense when the software was written decades ago but leaves you with unnecessarily large files today.
How much smaller will my file be after converting BMP to JPG?
Typically 10 to 20 times smaller, sometimes more, since BMP stores no compression at all and JPEG can discard a large amount of imperceptible detail.
Can I still open a BMP in most modern software?
Usually yes, BMP support is old and widespread, but the files are so much larger than necessary that converting to JPEG makes far more sense for sharing or storage.
Is BMP a lossless format like PNG?
Yes, standard BMP is uncompressed and therefore lossless, but unlike PNG it does not compress the data at all, which is why the files are so much larger for the same image.
Further reading
- WebP vs JPG vs AVIFJPG is universal, WebP is smaller and works everywhere that matters, and AVIF is smaller still but slow to make. Here is how to choose without guessing.6 min read
- PNG vs JPG: Which Should You Use?The rule is short: photographs go to JPG, anything with sharp edges or transparency goes to PNG. This post explains why, so you never have to guess again.6 min read
- What Is HEIC, and How Do You Open It?HEIC is why an iPhone photo will not open on a friend Windows laptop. Here is what the format is, why Apple chose it, and how to turn it into something everything can read.6 min read