What is the maximum size of the pdf generated on Salesforce Visualforce Attribute RenderAs?

Hi,

The maximum response size when creating a PDF file must be less than 15 MBbefore being rendered as a PDF file.

When designing Visualforce pages intended to be rendered to PDF, take the following considerations into account. Always verify the formatting and appearance of the PDF version of your page before putting it into production.
Limitations of the Visualforce PDF rendering service include the following.PDF is the only supported rendering service.
The PDF rendering service renders PDF version 1.4.

Rendering a Visualforce page as a PDF file is intended for pages designed and optimized for print.

A Visualforce page rendered as a PDF file displays either in the browser or is downloaded, depending on the browser’s settings. Specific behavior depends on the browser, version, and user settings, and is outside the control of Visualforce.
The PDF rendering service renders the markup and data on your page, but it might not render formatting contained within the contents of rich text area fields added to the page.
Long lines of text that don’t have break points, such as a space or dash, can’t be wrapped by the PDF rendering service. This most commonly happens with very long URLs, registry entries, and so on. When these lines are wider than the page, they increase the width of the page’s content beyond the edge of the PDF page. This causes content to “flow” off the side of the page, cutting it off.
Don’t use standard components that aren’t easily formatted for print, or form elements such as inputs or buttons, or any component that requires JavaScript to be formatted.
PDF rendering doesn’t support JavaScript-rendered content.
PDF rendering isn’t supported for pages in the Salesforce app.
The font used on the page must be available on the Visualforce PDF rendering service. Web fonts aren’t supported.
If the PDF file fails to display all the page’s text, particularly multibyte characters such as Japanese or accented international characters, adjust your CSS to use a font that supports them.

Hope this helps!