The maximum file size is 120MB for PDF or overlay PDF.
Colors of PDF's made for print might look different on the iPad screen because the iPad iOS does not support the CMYK color profile common in PDF's for printing.
PDF's need to be in the RGB color profile.
PDF's created from powerpoint or word are already in RGB. PDF's that come from graphical programs like Indesign are typically made for print in CMYK. To change the color scheme you will need to export it with RGB from Indesign. To do this with Acrobat, you'll need Acrobat Pro. Here's how: Converting PDF
dINK handles PDF documents with links.
When adding links with Indesign or Acrobat, please take care to point to links to the page number. Relative links (for example: link to 'Previous Page') will not work correctly.
We do not support secured PDF's. To enable this, you can unlock your PDF with free online tools like: www.pdfunlock.com