About the BMP to JPG
BMP is the old Windows bitmap format: it stores every pixel without compression, so files are huge and many websites, forms and email services refuse them. This converter turns BMP images into JPG, the format every phone, browser and app understands, usually cutting the file size by 90% or more. Convert one bitmap or a whole folder at once, set the quality with a slider and download the JPGs one by one or in a ZIP. The conversion happens on your own device, so nothing is uploaded.
Updated October 2026
How to use the BMP to JPG
- 1Click Select images, or drop your BMP files on the page.
- 2Adjust the quality slider if you want smaller or sharper files.
- 3Wait a moment while each image converts.
- 4Compare the new sizes with the originals.
- 5Download the JPGs one by one or all together as a ZIP.
When to convert BMP files
Old scanners, Paint, some medical and industrial software and older Windows programs still save BMP files. Convert them before emailing, uploading to a website or storing them in the cloud: the files become far smaller and open everywhere. Keep the original if you might need perfect pixel accuracy later.
Choosing the quality
The slider sets how hard JPG compresses the picture.
- 90–100%: almost no visible change, larger files
- 75–85%: the best balance for photos
- 50–70%: small files for web previews; edges may look soft
- Screenshots with text: use BMP to PNG instead
BMP, JPG and PNG compared
BMP keeps everything but wastes space. JPG is ideal for photos and gives the smallest files. PNG is lossless like BMP but compressed, so it suits logos, screenshots and diagrams. If you aren't sure, convert a sample both ways and compare sizes and sharpness.
Large batches
Add as many files as you like; they are converted one after another. On older phones very large bitmaps can take a few seconds each. When the batch is done, Download all saves a single ZIP with the same file names and a .jpg extension.
What the numbers in the list mean
Each row shows the original name, the new size and how much smaller the file became. A 24-bit BMP of 1920 × 1080 pixels is about 6 MB; as a JPG at 85% it is typically 300 to 700 KB. If a saving looks small, the BMP may already have been compressed with RLE, which some older programs use for simple graphics.
Colour and colour depth
Old BMPs are sometimes saved with 256 colours or fewer. The JPG is always saved in full 24-bit colour, so the picture looks exactly the same; it simply has room for more colours than it needs. Black-and-white scans saved as 1-bit BMPs convert well too, though PNG keeps their crisp edges better.
Phone and computer
The page works the same on Windows, Mac, Android and iPhone. There is no app to install, no account and no watermark. If you need a lossless file instead, the BMP to PNG tool keeps every pixel, and the Compress Image tool then shrinks it for email.
Features
- Batch convert many BMPs
- Quality slider from 40 to 100%
- Full resolution kept
- Huge size savings
- Download all as ZIP
- Private: images never leave your device
Frequently asked questions
Why are BMP files so big?
BMP usually stores each pixel's colour as raw bytes with no compression. A 12-megapixel photo is about 36 MB as a BMP but only 2 to 4 MB as a good-quality JPG.
Will I lose quality converting BMP to JPG?
JPG uses lossy compression, but at 85 to 95% quality the difference is invisible for photos. For screenshots or diagrams with sharp text, BMP to PNG keeps every pixel exactly.
What happens to transparency?
Most BMPs have no transparency. If yours does, the see-through areas become white, because JPG can't store transparency.
Can I convert BMP to JPG on my phone?
Yes. Open the page in your phone's browser, pick BMP files from your files app and download the JPGs.
Are my images uploaded?
No. They are converted in your browser and never leave your device.
Can it handle 1-bit or 8-bit BMPs?
Yes. The browser decodes standard 1, 4, 8, 16, 24 and 32-bit BMP files, and the JPG is always full colour.
Can I convert JPG back to BMP?
Some old software needs BMP. Browsers can't save BMP files directly, so use an image editor such as Paint for that; for everything else, JPG or PNG is better.
Does the converter change the image size in pixels?
No. The JPG has exactly the same width and height as the BMP. To make it smaller in pixels too, use the Image Resizer afterwards.