Acrobat's compression feature is one small part of a much larger, subscription-priced tool. Shrinking a PDF's file size doesn't need the rest of what Acrobat offers.
PDF compression mainly means re-encoding embedded images at a lower quality or resolution setting. That's a self-contained operation that a focused browser-based tool handles just as effectively as a full desktop editor.
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Compress your PDF for free →For typical image-heavy PDFs, yes — both approaches re-encode the embedded images to reduce size; the underlying technique is the same idea.
No, it runs directly in your browser with no download or install.