Quick Verdict
Use JPG when…
Use JPG for sharing, web publishing, and storage — it is 10–100× smaller than BMP with no perceptible quality difference for photographs at good quality settings.
Use BMP when…
Use BMP only for legacy Windows programming contexts or pixel-art workflows where lossless uncompressed pixel data is specifically required.
JPG vs BMP: Feature Comparison
| Feature | JPG | BMP |
|---|---|---|
| Compression | Lossy (DCT) | None (raw pixels) |
| File size (2 MP photo) | ~300 KB – 1.5 MB | ~6 MB |
| Transparency | No | Limited (1-bit mask) |
| Colour depth | 24-bit | 1, 4, 8, 16, 24, 32-bit |
| Web support | Universal | Not displayed natively in most browsers |
| Photo quality | Excellent at ≥80% quality | Perfect (no compression) |
| Editing & re-saving | Degrades each save | No degradation |
| Maximum resolution | 65535 × 65535 px | Varies by variant |
| Ideal use | Photos, web images, sharing | Pixel-art, legacy Windows apps |
When JPG wins
- ✓Compression: Lossy (DCT)
- ✓File size (2 MP photo): ~300 KB – 1.5 MB
- ✓Transparency: No
When BMP wins
- ✓Compression: None (raw pixels)
- ✓File size (2 MP photo): ~6 MB
- ✓Transparency: Limited (1-bit mask)
Frequently asked questions
Is BMP always better quality than JPG?
Technically yes — BMP has no compression so no artefacts. But in practice, a JPG saved at 90% quality is indistinguishable from BMP for photos. The difference only becomes visible at low quality settings or after many re-saves. For lossless photo editing, use TIFF or PNG instead of BMP.
Why does Windows still use BMP?
BMP is a native Windows format with deep OS integration — Paint uses it as default, system icons were historically BMP-based, and some APIs write BMP screenshots. Modern Windows uses PNG for icons, but BMP persists for backward compatibility and certain GDI programming contexts.
Can I convert BMP to JPG without visible quality loss?
Yes, at high quality settings. Convert with 90–95% quality in any image editor or converter — the result will be visually identical to the BMP and typically 10–15× smaller. Only avoid JPG if the image has text, sharp edges, or flat colour blocks (use PNG instead).
Will BMP display on websites?
Browsers technically support BMP but it is never used on websites because the files are enormous and PNG/WebP/JPG are always better alternatives. BMP images will load, but they'll consume far more bandwidth than necessary and slow page load times significantly.
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