To understand why that might be, we need to look into how compression works at a high level. Zipping photographs, music, and videos will typically not make them significantly smaller and can even make them slightly larger. Since photos, mp3, and other popular file formats are already compressed, compressing them again rarely has much effect, and can even make them larger. Compressing already-compressed files is one common scenario. All compression algorithms can create situations where the result could be bigger than the original.
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