JPG to BMP Converter — Convert JPEG to BMP Online
Need a JPG or JPEG as an uncompressed BMP bitmap for older Windows software? Drop your file below and pick BMP as the 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 JPG to BMP?
Almost nobody wants a BMP for its own sake. You convert a JPEG to BMP because something on the other end refuses to accept anything else — a program that was written before JPEG decoding was something you could take for granted, or a pipeline that wants plain pixels with no decompression step in front of them. Common reasons this conversion comes up:
- A legacy Windows application will only open
.bmpfiles - Firmware, splash screens, or embedded displays that expect raw bitmap data
- Machine-vision, OCR, or scientific tools that read pixels directly from the file
- Older Windows resource files and Win32 controls that take a device-independent bitmap
- A teacher, spec, or ticket that simply says the deliverable must be a BMP
What it is not good for is repairing a JPEG. If your goal is a lossless format that stays small, convert to JPG to PNG instead; if the goal is a smaller file for the web, use JPG to WebP.
BMP for Legacy Software Compatibility
BMP was Microsoft's native raster format, and its structure is about as simple as an image file gets: a short header followed by raw pixel rows. A program can read it with a few lines of code and no decoder library at all. JPEG is the opposite — a lossy codec with discrete cosine transforms, chroma subsampling, and a progressive mode that trips up naive readers. That gap is why decades-old software still asks for BMP, and why converting is usually easier than making the old program understand JPEG.
This converter writes a 24-bit uncompressed bitmap (BI_RGB, with the classic BITMAPINFOHEADER) — the most widely readable variant, which is exactly what you want when the reader is a piece of software you cannot change. Going the other direction later is easy: BMP to JPG turns the bitmap back into a compact, shareable file.
File Size Warning
Expect the BMP to be dramatically larger than the JPEG you started with — this is normal, and it is the whole point of an uncompressed format. A 24-bit BMP spends about 3 bytes on every pixel, so its size depends on the image's dimensions and nothing else. A blank white frame and a densely detailed photograph of the same size produce byte-for-byte identical file sizes:
- A 1920×1080 screenshot becomes roughly 5.9 MB of BMP
- A 12-megapixel photo at 4000×3000 becomes about 34 MB
The JPEG originals are frequently a tenth of that or less, because JPEG throws away information your eye is unlikely to miss. Since the conversion cannot recover any of that discarded detail, the extra megabytes buy you compatibility — not quality. Convert to BMP only when something downstream genuinely demands it, and keep the JPEG as the file you actually store and share.
How to Convert JPG to BMP
- Drag your JPG or JPEG file into the drop zone, or click to browse and select it.
- Choose BMP from the Output Format menu.
- Download the converted bitmap — it's saved straight to your device.
You can drop several JPEGs at once and grab them together as a ZIP. Nothing is uploaded: the decoding and the bitmap are both built in your browser, so even confidential scans and screenshots never leave your machine.
Frequently Asked Questions
Can I convert JPG to BMP for free?
Yes. This converter is completely free with no sign-up, watermarks, or file limits. Conversion runs entirely in your browser using JavaScript, so your images are never uploaded to a server.
Does converting JPG to BMP improve image quality?
No, and this is the most common misconception about BMP. JPEG permanently discards detail when it compresses, and nothing can put that detail back. Converting to an uncompressed format stores the damaged pixels faithfully — blocking, banding, and halos around edges are copied across exactly as they appear in the JPEG.
Does converting JPG to BMP lose quality?
The conversion itself adds no new loss. Your JPEG is decoded to pixels and every one of those pixels is written to the BMP unchanged. What the BMP cannot carry is metadata: there is no standard place for EXIF data or an embedded color profile, so keep the original JPEG as your master copy.
Why is the BMP so much larger than the JPG?
BMP stores every pixel uncompressed, while JPEG is built around aggressive lossy compression. A 24-bit BMP needs about 3 bytes per pixel, so its size is determined by the image dimensions rather than by what the image contains. Growth of ten times or more over the source JPEG is normal, not a sign that something went wrong.
What kind of BMP file does this produce?
A standard 24-bit uncompressed bitmap (BI_RGB) with a BITMAPINFOHEADER — the variant with the widest software support, including software old enough to predate every other format on this site. JPEG has no transparency, so there is no alpha channel to preserve.