What are the required PDF specifications?

We advise the following PDF settings:

• Non-flattened file, minimum Acrobat 5 (PDF 1.4)
• All pages same size
• First page (cover) should be included as single page, subsequent pages can be included as single pages or spreads
• No bleed and registration marks
• Automatic maximum quality JPEG compression
• Don't convert text to outlines (embed fonts)
• Minimum 150 dpi