Launch the Previewer tool to preview your book. Take the necessary time to ensure each page appears exactly as intended. 

A screenshot from the KDP publishing process. The heading is Book Preview and the button saying 'Launch Previewer' has been highlighted in green.
A screenshot from the KDP Previewer tool. Along the left side of the screen are errors the tool has picked up. Taking up the majority of the screen is the preview of our example book's cover.

Amazon will flag any issues it detects, such as images or text outside the margins. These will appear on the left side of the screen

A screenshot from the KDP Previewer tool. Along the left side of the screen are errors the tool has picked up. This section has been highlighted in green. 

Taking up the majority of the screen is the preview of our example book's interior. There is an error sign because the text is beyond the trim lines.

Depending on the issues, it may be able to correct them automatically. In our example, Amazon gave us the option to correct the manuscript size in order to avoid text being outside of the trim area, which it did relatively successfully: 

A screenshot from the KDP Previewer tool, following its automatic correction of our text and trim issue. Along the left side of the screen are errors the tool has picked up. 

Taking up the majority of the screen is the preview of our example book's interior. The text is now within the trim lines.

It is important to carefully review each page yourself, as the Amazon tool may not catch every error. 

After checking your book thoroughly, click Approve in the bottom-right of the preview tool.

Note – clicking Approve typically returns you to the top of the Content page. From here, scroll down to the bottom of the page and select ‘Save and Continue’ to move forward through the process. If publishing a paperback or hardback, you will notice that at the bottom of the page, there is now a Summary box which details your printing costs. 

A screenshot from the KDP publishing process for paperback and hardback books. The heading is 'Summary' and there is an overview of print options and printing costs in various marketplaces.