Yes, you can publish a book for free on Kindle Direct Publishing (KDP).
KDP is Amazon's self-publishing platform, which allows authors to upload their books and make them available for purchase on the Kindle store. With KDP, authors can publish their books in both eBook and print formats, and set the price and distribution options for their titles.
One of the biggest advantages of using KDP to publish your book is that it's free to use. You don't have to pay any fees upfront or sign any contracts to publish your book on the platform. Instead, you simply create a KDP account, upload your book and cover, and set your price and distribution options.
However, it's worth noting that while KDP doesn't charge any upfront fees, they do take a percentage of your royalties. This percentage varies depending on the price of your book and the distribution options you select. For example, if you choose to enroll your book in KDP Select (which offers additional promotional tools and benefits), you will earn royalties based on a different calculation than if you opt out of KDP Select.
In order to publish your book on KDP, you will need to format your manuscript according to Amazon's guidelines, which include requirements for file type, cover image size, and more. You may also want to consider hiring a professional editor or cover designer to help ensure that your book is of the highest quality possible.
Overall, publishing a book for free on KDP is a great option for many authors who want to reach a large audience and keep control over their publishing process. With the right preparation and marketing efforts, you can use KDP to publish and sell your book to readers all over the world.