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Why compressing PDFs to an exact small file size is often impossible

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A developer analyzed the technical constraints of compressing PDFs to meet strict size limits like 200KB. They explained that PDF tools typically use generic compression presets, which are ineffective for hard upload caps. The article details four compression mechanisms, two lossless and two lossy, and how they interact. It demonstrates through arithmetic that for multi-page scanned documents, reaching such a small target size often renders text unreadable. The author argues for tools that can report when a target is unreachable, and highlights the privacy benefit of client-side processing.

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