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Need to compress a PDF to meet a strict upload limit? While you can’t type in an exact target size, you can get very close quickly with the right compression settings and a few practical workarounds. Oversized PDFs tend to fail at the worst moment. A form rejects your upload, an email won’t send, or a portal caps attachments at 1 MB and your PDF comes in just over the limit. In this guide, we’ll show you how to compress a PDF to a chosen size using Smallpdf, plus what to do when standard compression isn’t enough for tight limits like 500 KB or 300 KB.