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Introduction

The markdown editor allows you to edit and preview markdown content, as well as upload images using drag and drop. 
use Filament\Forms\Components\MarkdownEditor;

MarkdownEditor::make('content')

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Security

By default, the editor outputs raw Markdown and HTML, and sends it to the backend. Attackers are able to intercept the value of the component and send a different raw HTML string to the backend. As such, it is important that when outputting the HTML from a Markdown editor, it is sanitized; otherwise your site may be exposed to Cross-Site Scripting (XSS) vulnerabilities. When Filament outputs raw HTML from the database in components such as TextColumn and TextEntry, it sanitizes it to remove any dangerous JavaScript. However, if you are outputting the HTML from a Markdown editor in your own Blade view, this is your responsibility. One option is to use Filament’s sanitizeHtml() helper to do this, which is the same tool we use to sanitize HTML in the components mentioned above: 
{!! str($record->content)->markdown()->sanitizeHtml() !!}

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Customizing the toolbar buttons

You may set the toolbar buttons for the editor using the toolbarButtons() method. The options shown here are the defaults: 
use Filament\Forms\Components\MarkdownEditor;

MarkdownEditor::make('content')
    ->toolbarButtons([
        ['bold', 'italic', 'strike', 'link'],
        ['heading'],
        ['blockquote', 'codeBlock', 'bulletList', 'orderedList'],
        ['table', 'attachFiles'],
        ['undo', 'redo'],
    ])
Each nested array in the main array represents a group of buttons in the toolbar.

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Uploading images to the editor

Images may be uploaded to the editor. They will always be uploaded to a publicly available URL with public storage permissions, since generating temporary file upload URLs is not supported in static content. You may customize where images are uploaded using configuration methods: 
use Filament\Forms\Components\MarkdownEditor;

MarkdownEditor::make('content')
    ->fileAttachmentsDisk('s3')
    ->fileAttachmentsDirectory('attachments')

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Validating uploaded images

You may use the fileAttachmentsAcceptedFileTypes() method to control a list of accepted mime types for uploaded images. By default, image/png, image/jpeg, image/gif, and image/webp are accepted: 
use Filament\Forms\Components\MarkdownEditor;

MarkdownEditor::make('content')
    ->fileAttachmentsAcceptedFileTypes(['image/png', 'image/jpeg'])
You may use the fileAttachmentsMaxSize() method to control the maximum file size for uploaded images. The size is specified in kilobytes. By default, the maximum size is 12288 KB (12 MB): 
use Filament\Forms\Components\MarkdownEditor;

MarkdownEditor::make('content')
    ->fileAttachmentsMaxSize(5120) // 5 MB