The maximum file size is 120MB for PDF files.
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. PDFs that come from graphical programs like Indesign are typically made for print in CMYK. To change the color scheme you will need to export the file with RGB from Indesign. To change the color scheme with Adobe Acrobat, you'll need Acrobat Pro. Here's how: Converting PDF
Linking pages in PDF
d!nk 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 PDFs. To use secure PDFs, we suggest to unlock your PDF with free online tools like www.pdfunlock.com