How to Compress a PDF Without Losing Quality
Some PDF compression is genuinely lossless and some is not. Here is exactly which operations change your document and which cannot possibly.
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4 guides tagged “PDF”.
Some PDF compression is genuinely lossless and some is not. Here is exactly which operations change your document and which cannot possibly.
A scan is a stack of photographs, so ordinary PDF compression barely helps. Downsampling to 150 DPI and greyscale typically cuts 80–95%.
Divide the file size by the page count and the cause becomes obvious — scanned images, print-resolution graphics or embedded fonts each need a different fix.
Find out why your PDF is large — scanned pages, embedded fonts or print-resolution images — then pick the compression method that fits your platform.