> For the complete documentation index, see [llms.txt](https://docs.platter.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.platter.com/checkout/checkout-extensions.md).

# Checkout extensions

In this section, you will learn about each type of checkout extension, see examples, and get detailed instructions on how to add them to your checkout.

Here are links to each type of extension:

* [In-Checkout Cross-Sells](/checkout/checkout-extensions/in-checkout-cross-sells.md)
* [Tiered Promotion Progress Bar](/checkout/checkout-extensions/promotion-progress-bar.md)
* [Alert Banner](/checkout/checkout-extensions/alert-banner.md)
* [Testimonials](/checkout/checkout-extensions/testimonials.md)
* [Checkbox With Input](/checkout/checkout-extensions/checkbox-with-input.md)
* [Dropdown Text](/checkout/checkout-extensions/dropdown.md)
* [Icons With Text](/checkout/checkout-extensions/icons-with-text.md)
* [Image Block ](/checkout/checkout-extensions/image-block.md)
* [Text Block](/checkout/checkout-extensions/text-block.md)