BMP to JPG Converter — Convert Bitmap to JPEG Online
Drop a BMP below, set the quality you want, and download the JPG. JPG is already the selected output format — free, private, and entirely in your browser with no upload required.
Drop images here or click to browse
Supports HEIC, WEBP, AVIF, BMP, TIFF, SVG, GIF, ICO, PDF, JPG, PNG
100% Private — Your files never leave your device
All conversion happens directly in your browser using JavaScript. Nothing is uploaded to any server. Your images stay on your computer the entire time.
Why Convert BMP to JPG?
BMP was Microsoft's native raster format, and it stores pixels exactly as they are: a short header followed by raw, uncompressed rows. That simplicity is why old Windows software liked it, and it's also why a single bitmap can be tens of megabytes. JPG applies lossy compression tuned for photographs, discarding detail the eye is poor at noticing, and produces a file small enough to email, upload, or store in bulk. Common reasons to make the switch:
- Attaching photos to email or messaging apps that enforce size limits
- Uploading to websites, CMSes, and social platforms, which often reject BMP outright
- Reclaiming disk space from a legacy archive of bitmaps
- Making scans and old Windows screenshots shareable
- Serving images to browsers, where BMP support is inconsistent and never optimised
BMP vs JPG File Size Comparison
A BMP's size is arithmetic, not a guess. A 24-bit bitmap spends 3 bytes on every pixel — one each for red, green, and blue — plus a small header and a few padding bytes per row. Multiply width by height by three and you have the file, whatever the image actually shows:
| Dimensions | Pixels | 24-bit BMP size |
|---|---|---|
| 1280 × 720 | 0.9 million | ~2.8 MB |
| 1920 × 1080 | 2.1 million | ~6.2 MB |
| 3000 × 2000 | 6 million | ~18 MB |
| 4000 × 3000 | 12 million | ~36 MB |
JPG works the opposite way: its size depends on what the image contains and how hard you compress it. A photo of a clear sky compresses far further than a photo of gravel at the same dimensions, so no honest converter can promise you a fixed percentage saving. What is reliable is the direction — a photographic JPG lands well under its bitmap equivalent — and the control you have over it. Drag the quality slider down and the file shrinks while compression artifacts creep in around edges; drag it up and the file grows. If you need a smaller file with no quality loss at all, convert BMP to PNG instead: PNG compresses losslessly, so it beats BMP on size while keeping every pixel intact.
When to Keep BMP Format
Converting to JPG throws away image data permanently, and JPG cannot store transparency. Keep the bitmap when:
- Legacy Windows, industrial, or embedded software only accepts BMP
- A machine-vision, OCR, or scientific pipeline needs byte-predictable pixel access
- The image is a screenshot, diagram, logo, or anything with text and hard edges — JPG's compression smears exactly those
- You need an alpha channel, which JPG has no way to encode
- The BMP is your only master copy and further editing is likely
For the middle three cases, BMP to PNG is usually the better answer than staying on BMP: it is lossless, supports transparency, and every browser renders it. And if you have already converted to JPG and now want a lossless working copy, a JPG to PNG conversion will stop any further generational loss — though it cannot restore the detail the first JPG encode discarded.
How to Convert BMP to JPG
- Drag your BMP file into the drop zone above, or click it to browse and select one.
- Leave the Output Format menu on JPG — it's selected by default.
- Adjust the Quality slider if you need to. It starts at 92%, a good default for photographs; lower it for a smaller file.
- Click Download on the finished file, or Download All to get a ZIP of every conversion.
Keep the original BMP until you have checked the JPG at full size. The conversion is one-way — once the bitmap is gone, the discarded detail cannot be recovered by converting back.
Frequently Asked Questions
Can I convert BMP to JPG for free?
Yes. There is no sign-up, no watermark, and no file limit. The conversion runs in your browser using JavaScript, so your bitmaps are never uploaded to a server.
How much smaller will the JPG be?
Substantially smaller, but there is no fixed ratio. A BMP's size is set by its dimensions — a 24-bit bitmap uses about 3 bytes per pixel no matter what it depicts. A JPG's size depends on the picture's content and the quality setting you choose, so a smooth photo compresses far more than a detailed one.
Does converting BMP to JPG lose quality?
Yes. JPG is a lossy format, so some image data is discarded. At the default 92% quality the loss is usually invisible at normal viewing size. The loss compounds each time a JPG is re-saved, so convert once from the original BMP rather than repeatedly re-exporting the JPG.
Should I convert BMP to JPG or PNG?
Choose JPG for photographs and other continuous-tone images. Choose PNG for screenshots, logos, line art, text, or anything needing transparency — JPG's compression blurs sharp edges and cannot store an alpha channel.
Can I convert several BMP files at once?
Yes. Drop in as many bitmaps as you like and they are converted together. Once more than one has finished, a Download All button packages the results into a single ZIP file.