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+---
+title: Introduction
+description: An introduction to Hugo's render hooks.
+categories: [render hooks]
+keywords: []
+menu:
+  docs:
+    identifier: render-hooks-introduction
+    parent: render-hooks
+    weight: 20
+weight: 20
+---
+
+When rendering Markdown to HTML, render hooks override the conversion. Each render hook is a template, with one template for each supported element type:
+
+- [Code blocks](/render-hooks/code-blocks)
+- [Headings](/render-hooks/headings)
+- [Images](/render-hooks/images)
+- [Links](/render-hooks/links)
+
+{{% note %}}
+Hugo supports multiple [content formats] including Markdown, HTML, AsciiDoc, Emacs Org Mode, Pandoc, and reStructuredText.
+
+The render hook capability is limited to Markdown. You cannot create render hooks for the other content formats.
+
+[content formats]: /content-management/formats/
+{{% /note %}}
+
+For example, consider this Markdown:
+
+```text
+[Hugo](https://gohugo.io)
+
+![kitten](kitten.jpg)
+```
+
+Without link or image render hooks, this example above is rendered to:
+
+```html
+<p><a href="https://gohugo.io">Hugo</a></p>
+<p><img alt="kitten" src="kitten.jpg"></p>
+```
+
+By creating link and image render hooks, you can alter the conversion from Markdown to HTML. For example:
+
+```html
+<p><a href="https://gohugo.io" rel="external">Hugo</a></p>
+<p><img alt="kitten" src="kitten.jpg" width="600" height="400"></p>
+```
+
+Each render hook is a template, with one template for each supported element type:
+
+```text
+layouts/
+└── _default/
+    └── _markup/
+        ├── render-codeblock.html
+        ├── render-heading.html
+        ├── render-image.html
+        └── render-link.html    
+```
+
+The template lookup order allows you to create different render hooks for each page [type], [kind], language, and [output format]. For example:
+
+```text
+layouts/
+├── _default/
+│   └── _markup/
+│       ├── render-link.html
+│       └── render-link.text.txt
+├── books/
+│   └── _markup/
+│       ├── render-link.html
+│       └── render-link.text.txt
+└── films/
+    └── _markup/
+        ├── render-link.html
+        └── render-link.text.txt
+```
+
+[kind]: /getting-started/glossary/#page-kind
+[output format]: /getting-started/glossary/#output-format
+[type]: /getting-started/glossary/#content-type
+
+The remaining pages in this section describe each type of render hook, including examples and the context received by each template.