Will content be stretched?

No — pages are scaled proportionally and centred on the new sheet size.

Which size should I pick?

A4 for most of the world, US Letter for North America.

Rescale a document so every page matches A4 or US Letter, keeping content proportional so nothing is cut off.

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Will content be stretched?: No — pages are scaled proportionally and centred on the new sheet size.
Which size should I pick?: A4 for most of the world, US Letter for North America.

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Trim margins from every page.

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Turn pages the right way up.

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Combine PDFs in the order you want.

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Shrink file size, keep quality.