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How to Compress a PDF on Mac Without Running the Filter Twice

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Preview's File > Export menu includes a Reduce File Size filter that shrinks PDFs locally on a Mac, without uploading anything. Users should save the result under a new name to keep the original intact, since Apple warns compressed copies may have lower quality. Testing showed large savings for scanned or photo-heavy files, while text-only PDFs barely shrink. Running the filter a second time backfired, growing one test file from 4.3 MB to 23.5 MB. Checking the output file size before sending is recommended.

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