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PDF compression mainly reduces the weight of embedded images (photos, scans, logos). Vector text and curves are preserved losslessly, even at 30% quality. For a purely text-based PDF without images, the gain is often negligible (less than 10%).
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Max 100 Mo
PDF compression mainly reduces the weight of embedded images (photos, scans, logos). Vector text and curves are preserved losslessly, even at 30% quality. For a purely text-based PDF without images, the gain is often negligible (less than 10%).
Technical limit
Too aggressive compression (< 40%) can degrade QR codes and small text within images. Always check the output before deleting the original.
Recommended quality
80-100%
Archiving, printing
10-30%
50-70%
Email sharing, web
40-60%
20-40%
Drafts, large attachments
70-85%
When compression is useless
A 3-page PDF containing only text and simple tables: the gain will be under 5%, because vector text does not "compress". In this case, prefer a PDF cleanup to remove unnecessary objects.