Will Compress make text fuzzy?

Selectable text usually stays sharp. Photos and scanned pages take the quality hit. If a scan looks bad, use a milder preset or OCR a better source.

Compress vs Optimize?

Compress reduces bytes, mostly via images. Optimize linearizes for streaming display. Run Compress for size, Optimize when the file will be read in a browser.

Is compression reversible?

No. Keep the original. Extreme especially discards image data you cannot get back.

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Compress

Reduce file size with quality levels

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