How many pages fit on a sheet?

It depends on the columns you choose — four across on A4 gives around twenty.

Will the thumbnails be readable?

Not for reading. They are for recognising a page, not for reading it.

Make a PDF Contact Sheet

One sheet showing thumbnails of every page, for reviewing a long document.

Runs in your browser

How it works

Renders every page small and lays them out in a grid, numbered. It is the fastest way to find a particular page in a long scan, to check a document came out in the right order, or to spot the blank and upside-down pages before you start fixing them.

Related tools

N-Up PDF

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PDF to Images

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Inspect PDF

/inspect-pdf

Questions

How many pages fit on a sheet?: It depends on the columns you choose — four across on A4 gives around twenty.
Will the thumbnails be readable?: Not for reading. They are for recognising a page, not for reading it.
Can I do part of a document?: Yes, with a page range.