Convert to BMP only if you're working with legacy software that doesn't support modern formats, or specific professional workflows that require uncompressed images. BMP files are much larger but prevent further compression. For most users, PNG is a better choice.
No. Converting JPG to BMP won't restore quality lost from JPG compression. BMP just stores the already-compressed image without further compression. It's like making a photocopy - the BMP is a perfect copy of the JPG, but can't be better than the original.
BMP files are typically 5-15 times larger than JPG. A 1MB JPG photo might become a 15MB BMP. BMP stores every pixel without compression, leading to enormous file sizes compared to JPG's efficient compression.
Not necessarily. Modern image editors can work with JPG, PNG, and other formats just fine. PNG is better than BMP for editing - it's lossless like BMP but much smaller. Use BMP only if your specific software requires it.
Use BMP only for legacy software compatibility or specific professional workflows. For general image editing, use PNG (lossless). For photos, use JPG (smaller files). BMP's uncompressed nature makes it impractical for modern workflows.