Currently InstaPDF for iOS captures an image that is then embedded into a PDF. A single page document is therefore 100-200kb large. We are currently working on a feature that allows for a reduction of document file sizes.

Uploads are limited to 150MB and 250 pages per document.

Please update to InstaPDF 5.1 - upload reliability and speed has been drastically improved. Furthermore, all uploaded PDFs are now compressed by default.