Compress a PDF Hard
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Recompress the pictures inside the file. Much smaller than lossless, and lossy by design.
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The standard Compress PDF tool rewrites the file structure and repacks its streams without altering a single image byte. On a text document that is most of the file and the saving is real. On a document that is mostly photographs it is almost nothing, because the photographs are already compressed and are the whole file.
This tool re-encodes those photographs. On a scanned or image-heavy document the difference is not marginal: where lossless saves a fifth, this can save the large majority of the file.
This is lossy and irreversible. Keep the original if the images matter, and use the lossless Compress PDF tool when the document must not change at all.
Compress PDF is lossless: it repacks the file and leaves every image byte alone. This one re-encodes the images, which is where the size is in a photo-heavy document, and that means it changes them.
It depends entirely on how much of the file is images. A text document may barely change. A scanned or photo-heavy one commonly loses most of its size.
60 is a reasonable start. Above 80 the difference from the original is hard to see; below 40 it is obvious. Try one and look at the result.
It downsamples any image wider than that value. A 4000 pixel photograph placed at a tenth of that size on the page is carrying detail nobody will ever see, and reducing it saves more than quality alone.
No. Recompression is lossy and the discarded detail is gone. Keep the original.