Upload PDFs and embed them straight into your site – just like adding images! PDFs will be automatically sized to their natural size and shape (or just fill the width available if they are too big). Optionally, you can specify a width and the correct height will be calculated automatically. The shape will be recalculated whenever the page is resized by the user.
The free viewer currently has Next/Prev buttons to page through the document, and zoom buttons.
Even if other plugins use similar technology, they will insert the PDF itself into an ‘iframe’ which means they do not get the flexibility over sizing.