BMP (Bitmap Image File) and JPG (Joint Photographic Experts Group (JPEG)) are built for different jobs. BMP is typically used for legacy windows apps, embedded systems, while JPG is best for photos, social media, email attachments. Converting lets you open, share or upload your files wherever JPG is expected.
How to use the BMP to JPG converter
- Add your BMP filesClick “Choose Files” or drag and drop them into the box. You can add many files at once — or paste a file with Ctrl+V.
- Choose JPG and adjust settingsJPG is selected automatically. Optionally open Settings to change quality, size or background.
- Convert and downloadPress “Convert”. Your JPG files appear instantly — download them one by one or all together as a ZIP.
BMP vs JPG
BMP Bitmap Image File
BMP stores raw pixel data with little or no compression. Files are large but simple to read, which is why legacy Windows software, embedded devices and some printers still require it.
- Compression
- Uncompressed
- Features
- No transparency (usually)
- Origin
- 1985, Microsoft
- Best for
- Legacy Windows apps, embedded systems
JPG Joint Photographic Experts Group (JPEG)
JPG is the most widely supported photo format. It uses lossy compression that discards detail the eye barely notices, producing small files that open on every device, browser and app — ideal for photographs, less so for text or line art.
- Compression
- Lossy
- Features
- No transparency
- Origin
- 1992, JPEG committee
- Best for
- Photos, social media, email attachments
Why use ConvertMathly?
Files are processed on your device and never uploaded. Close the tab and they are gone.
No account, no daily cap, no queue and no watermark — convert as much as you want.
No waiting for uploads or downloads: results are ready as fast as your device can process them.
Windows, Mac, Linux, Chromebook, iPhone and Android — any modern browser, nothing to install.
Frequently asked questions
How do I convert BMP to JPG?
Add your BMP files above, make sure JPG is selected and press Convert. The JPG files are ready to download a few seconds later — no installation or account required.
Will converting BMP to JPG reduce quality?
JPG uses lossy compression, but at the default 90% quality the difference is practically invisible. Raise the quality slider to 100% for maximum fidelity or lower it for smaller files.
What happens to transparent areas?
JPG does not support transparency, so transparent pixels are filled with a background color — white by default. You can choose any color in Settings.
Is there a file size or daily limit?
No. Since everything runs locally, there are no daily caps, queues or file size limits beyond what your device can handle.
Are my BMP files uploaded to a server?
No. ConvertMathly converts files entirely inside your web browser using JavaScript and WebAssembly. Your files never leave your computer or phone, which makes it safe for private photos and documents.
Can I convert multiple BMP files at once?
Yes — add as many files as you like. They are converted one after another and you can download everything in a single ZIP.