PJPEG to BMP2 Converter
FileFlip converts PJPEG to BMP2 entirely inside your browser, using ImageMagick compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert a PJPEG file to BMP2?#
- Drop your PJPEG file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to BMP2 and the conversion starts on its own. FileFlip downloads 14.1 MB of WebAssembly the first time and nothing after that, then runs ImageMagick on your own machine.
- Save the BMP2 file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting PJPEG to BMP2 lose quality?#
BMP2 is a lossless format, so nothing further is lost here, but nothing is recovered either. Whatever the PJPEG encoder already threw away is gone, and the BMP2 file will usually be several times larger for exactly the same content.
Is it safe to convert PJPEG files online?#
Yes, because nothing is uploaded. FileFlip converts PJPEG files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What PJPEG to BMP2 actually does to the file#
Converting PJPEG to BMP2 runs on ImageMagick, downloads 14.1 MB of WebAssembly the first time and nothing after that, writes a lossless file that cannot recover what the source already discarded, and drops EXIF metadata and ICC colour profile.
| Engine | ImageMagick |
|---|---|
| Conversion path | One step: PJPEG → BMP2 |
| Downloaded to your browser | 14.1 MB, once, then cached by your browser |
| Quality | Lossless output, but nothing is recovered |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| EXIF metadata | Dropped | The target format has nowhere to put it. |
| ICC colour profile | Dropped | The target format has nowhere to put it. |
What is a PJPEG file?#
PJPEG is progressive JPEG, a JPEG encoding choice rather than a different file format, where the image is built up through several increasingly detailed scans across the whole picture instead of filling in top to bottom in one pass.
Choose progressive encoding for images shown over a slow or uncertain connection, where a quick blurry preview beats a slow top-down reveal.
Convert to baseline JPEG when a downstream tool or embedded device only supports the simpler sequential scan order.
What is a BMP2 file?#
BMP2 is ImageMagick's name for a Windows bitmap saved with the original 12-byte BITMAPCOREHEADER from 1987's OS/2 1.x, an encoding choice rather than a different file format, so the result is an ordinary uncompressed .bmp using the oldest and most limited header structure.
Choose BMP2 only when a specific legacy OS/2 or early-1990s Windows program requires the old-style bitmap header.
Save as standard BMP or BMP3 for anything opened on a modern system, since BMP2's extra compatibility buys nothing there.
PJPEG to BMP2 questions people ask#
What is PJPEG?
PJPEG is progressive JPEG, a JPEG file encoded in a handful of increasingly detailed scans instead of one pass from top to bottom. It's still a JPEG file, just encoded differently, and opens anywhere JPEG does.
What's the difference between PJPEG and a regular JPEG?
A regular, baseline JPEG fills the image in from top to bottom as it loads. PJPEG encodes several scans of the whole picture, each adding sharper detail, so a rough version of the entire image appears almost immediately and refines as more data arrives.
Does progressive JPEG reduce image quality?
No, PJPEG uses the same lossy JPEG compression as baseline JPEG at a given quality setting, and often produces a slightly smaller file because each scan can use its own optimized Huffman table.
What is BMP2?
BMP2 is ImageMagick's name for a Windows bitmap written with the original 12-byte BITMAPCOREHEADER from OS/2 1.x, not a separate image format. The file is still a plain, uncompressed .bmp and opens anywhere BMP does.