How to Shrink Large PDFs Without Noticeable Quality Loss

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Oversized PDFs are typically caused by high-resolution images, embedded fonts, duplicated content, and leftover metadata from incremental saves. Compression tools reduce file size by downsampling images, re-encoding them at lower quality, and stripping unused objects — some steps are lossy while structural cleanup is lossless. For screen viewing, 96–150 dpi images suffice, while standard printing calls for around 300 dpi. Experts recommend compressing a copy rather than the original, checking legibility after compression, and avoiding repeated compression cycles to prevent stacking quality loss. Scanning in grayscale, using 'web' export presets, and resizing photos before embedding them are practical ways to keep PDFs lean from the start.

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