BMP vs MJPEG
A detailed comparison of BMP Image and Motion JPEG — file size, quality, compatibility, and which format to choose for your workflow.
Technical Specifications
| Specification | .BMP | .MJPEG |
|---|---|---|
| MIME type | image/bmp | video/x-motion-jpeg |
| Extensions | .bmp, .dib | — |
| Compression | None (typical); RLE 4/8 bit (rare) | — |
| Color depths | 1, 4, 8, 16, 24, 32 bits per pixel | — |
| Byte order | Little-endian | — |
| Extension | — | .mjpeg, .mjpg |
| Frame format | — | Sequential JPEG (Baseline, usually 4:2:0) |
| Typical containers | — | AVI, MOV, MP4 (rare), raw stream |
| Common in | — | IP security cameras, USB webcams, scientific imaging |
Strengths Comparison
.BMP Strengths
- Dead-simple format — trivially easy to read and write.
- Lossless and uncompressed — perfect bit-exact pixel storage.
- Universally supported in Windows applications since 1985.
- Supports 1, 4, 8, 16, 24, and 32-bit color depths.
.MJPEG Strengths
- Trivially simple — any JPEG decoder handles frames.
- Every frame is a keyframe — instant seek and edit.
- No inter-frame dependencies — recover from packet loss easily.
- Hardware cost is minimal — any JPEG decoder works.
- Lossless across edits — cutting and rejoining doesn't degrade quality.
Limitations
.BMP — Limitations
- Enormous file sizes — no meaningful compression in typical use.
- Not a web format — browsers support it but nobody serves BMPs over HTTP.
- No metadata support (no EXIF, no ICC profile in practice).
- Multiple header versions mean "a BMP" is ambiguous — parsers must handle several variants.
.MJPEG — Limitations
- 3-5× larger than MPEG-2; 8-10× larger than H.264 at comparable quality.
- No audio — requires a separate track.
- No standard container — appears inside AVI, MOV, MKV, MJPEG-over-HTTP.
- Obsolete for mass-market delivery.
Frequently Asked Questions
BMP (Bitmap) is a raster image format developed by Microsoft for Windows. It stores images with no compression by default, resulting in large file sizes but pixel-perfect quality. It has been part of Windows since version 1.0.
MJPEG (Motion JPEG) is a video container format that bundles one or more video streams, audio tracks, and optional subtitles into a single file. The container format determines how metadata is organised and which codecs can live inside; the visual quality itself depends on the codec (H.264, H.265, VP9, AV1) rather than the MJPEG wrapper. It is part of the video files family.
BMP files open in Windows Paint, Photos, macOS Preview, GIMP, Photoshop, and virtually any image viewer. All Windows applications support BMP natively.
VLC, MPV and PotPlayer play nearly every MJPEG file on desktop. Browser support varies: modern Chromium, Firefox and Safari play common containers via the HTML5 <video> tag, but niche MJPEG variants may fail. If a device refuses your MJPEG, convert to MP4 with our MJPEG to MP4 converter for universal playback.
PNG is better than BMP in almost every scenario since it provides lossless compression (smaller files), transparency support, and wider cross-platform use. BMP is mainly relevant for legacy Windows applications.
Upload your MJPEG to KaijuConverter and pick MP4, MOV, MKV, WebM, or any other target. Our pipeline uses FFmpeg under the hood and stream-copies when codecs are compatible (no quality loss) or transcodes at high-quality defaults otherwise. Conversion runs server-side; both files delete within two hours.
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