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---
layout: default
title: Basic Usage
description: Basic usage of the CommonMark parser
---
# Basic Usage
<i class="fa fa-exclamation-triangle"></i>
**Important:** See the [security](/2.6/security/) section for important details on avoiding security misconfigurations.
The `CommonMarkConverter` class provides a simple wrapper for converting Markdown to HTML:
```php
require __DIR__ . '/vendor/autoload.php';
use League\CommonMark\CommonMarkConverter;
$converter = new CommonMarkConverter();
echo $converter->convert('# Hello World!');
// <h1>Hello World!</h1>
```
Or if you want GitHub-Flavored Markdown:
```php
require __DIR__ . '/vendor/autoload.php';
use League\CommonMark\GithubFlavoredMarkdownConverter;
$converter = new GithubFlavoredMarkdownConverter();
echo $converter->convert('# Hello World!');
// <h1>Hello World!</h1>
```
## Using Extensions
The `CommonMarkConverter` and `GithubFlavoredMarkdownConverter` shown above automatically configure [the environment](/2.6/customization/environment/) for you, but if you want to use [additional extensions](/2.6/customization/extensions/) you'll need to avoid those classes and use the generic `MarkdownConverter` class instead to customize [the environment](/2.6/customization/environment/) with whatever extensions you wish to use:
```php
require __DIR__ . '/vendor/autoload.php';
use League\CommonMark\Environment\Environment;
use League\CommonMark\Extension\InlinesOnly\InlinesOnlyExtension;
use League\CommonMark\Extension\SmartPunct\SmartPunctExtension;
use League\CommonMark\Extension\Strikethrough\StrikethroughExtension;
use League\CommonMark\MarkdownConverter;
$environment = new Environment();
$environment->addExtension(new InlinesOnlyExtension());
$environment->addExtension(new SmartPunctExtension());
$environment->addExtension(new StrikethroughExtension());
$converter = new MarkdownConverter($environment);
echo $converter->convert('**Hello World!**');
// <p><strong>Hello World!</strong></p>
```
## Configuration
If you're using the `CommonMarkConverter` or `GithubFlavoredMarkdownConverter` class you can pass configuration options directly into their constructor:
```php
use League\CommonMark\CommonMarkConverter;
use League\CommonMark\GithubFlavoredMarkdownConverter;
$converter = new CommonMarkConverter($config);
// or
$converter = new GithubFlavoredMarkdownConverter($config);
```
Otherwise, if you’re using `MarkdownConverter` to customize the extensions in your parser, pass the configuration into the `Environment`'s constructor instead:
```php
use League\CommonMark\Environment\Environment;
use League\CommonMark\Extension\InlinesOnly\InlinesOnlyExtension;
use League\CommonMark\MarkdownConverter;
// Here's where we set the configuration array:
$environment = new Environment($config);
// TODO: Add any/all the extensions you wish; for example:
$environment->addExtension(new InlinesOnlyExtension());
// Go forth and convert you some Markdown!
$converter = new MarkdownConverter($environment);
```
See the [configuration section](/2.6/configuration/) for more information on the available configuration options.
## Supported Character Encodings
Please note that only UTF-8 and ASCII encodings are supported. If your Markdown uses a different encoding please convert it to UTF-8 before running it through this library.
## Return Value
The `convert()` method actually returns an instance of `League\CommonMark\Output\RenderedContentInterface`. You can cast this (implicitly, as shown above, or explicitly) to a `string` or call `getContent()` to get the final HTML output.
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