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The ASP.NET Core Rich Text Editor is a feature-rich WYSIWYG HTML editor and WYSIWYG Markdown editor. The Rich Text Editor is widely used to create blogs, forum posts, notes sections, support tickets (incidents), comment sections, messaging applications, and more. The control provides an efficient user interface for a better editing experience with mobile support. It has a variety of tools to edit and format rich content and returns valid HTML markup or Markdown (MD) content. It allows users to insert images, links, tables, and lists with modular architectures.


The ASP.NET Core Rich Text Editor control can be used as a WYSIWYG HTML editor. It allows users to view and edit content as HTML markup and to view the HTML source using the Code View icon.

Markdown editor

The ASP.NET Core Rich Text Editor control can be used as a ASP.NET Core WYSIWYG Markdown Editor. It allows the content to be in the markdown format. The typed markdown syntax content can be previewed using a third-party plugin.

Inline mode

Makes the inline HTML editor to show up when you click or select the content in an editable area.

ASP.NET Core WYSIWYG Inline HTML editor

WYSIWYG HTML editor Iframe mode

The ASP.NET Core Rich Text Editor supports Iframe editing with customized Iframe attributes. It also easily changes the appearance of Iframe editor’s content when using external CSS and script files.

HTML editor toolbar

The WYSIWYG HTML editor toolbar provides a variety of commands for editing and formatting the content. You can format text, paragraphs, insert images, insert hyperlinks, insert tables, insert lists, etc. The tool commands are grouped together based on related functionality.

Multi-row toolbar

The overflow toolbar commands are wrapped in the following rows within the toolbar.

Expand toolbar

The overflow toolbar commands hidden in the next row become visible when the toolbar is expanded via the expand icon.

ASP.NET Core Rich Text Editor with Quick toolbar

Quick toolbar

This toolbar contains frequently used commands related to text, image, tables, and links. It helps access and format these elements (text, image, tables, links) quickly, and allows you to customize it.

ASP.NET Core Rich Text Editor with Floating toolbar

Floating the toolbar

The HTML WYSIWYG editor toolbar does not stick to the top of the editor, but floats within the editor area while scrolling the editor page.

Fully customizable tools in ASP.NET Core Rich Text Editor

Fully customizable

The toolbar of the ASP.NET Core Rich Text Editor control is fully customizable with its buttons. You can add or remove buttons and also group commands based on category. This helps you to design the toolbar based on the application needs like HTML blog editor, HTML email composer, and more.

Custom tool

Users can add their own commands(tools) with actions to the toolbar along with built-in commands.

Editing experience

The ASP.NET Core Rich Text Editor control provides a wide range of tools and options for a better editing experience.

Formatting text

You can apply formatting to a selected content, whole paragraphs, or specific words or characters:

  • Apply formatting to headings, quotations, code, paragraphs, etc.
  • Bold, italicize, underline, strikethrough, or capitalize letters and words.
  • Change paragraph indentation and spacing.
  • Select fonts and its size value.
  • Use subscripts and superscripts.
  • Select font color and the background color for the content.

Images Insert in ASP.NET Core HTML WYSIWYG editor

Insert images

You can insert images in your content from a local path or server path with image captions and then link URLs to the images. You can upload images to a server with drag-and-drop or file upload. Additionally, the editor offers options to insert images in BLOB or Base64 formats.

Hyperlinks Insert in WYSIWYG ASP.NET Core HTML editor

You can insert or change the hyperlinks with customization options such as display text, tooltip, and link to be opened in a new window.

Insert tables in ASP.NET Core rich text editor

Insert tables

You can insert and edit HTML tables to display grid-like tabular data in WYSIWYG Rich Text Editor. Allows manipulation of the table and its elements dynamically such as insert/remove rows and columns, resize whole table or rows or columns, and remove a table.

ASP.NET Core rich text editor with text alignment tools

Text alignment

The built-in settings are available to align your content to the left, center, right, or justify it.

Adding lists

Create ordered (numbered) or unordered (bulleted) lists to organize the content.

Full screen text editor

The built-in option makes the WYSIWYG HTML editor full screen size (full page editor) for editing the content.

ASP.NET Core rich text editor with clipboard operations

Cut, copy, and paste

The rich text editor typically allows users to use clipboard operations (cut, copy, and paste).

ASP.NET Core rich text editor with undo redo actions

Undo redo manager

The ASP.NET Core Rich Text Editor manages the undo action history to store users’ editing actions, and also to customize the undo steps.

Source code (HTML) view

Examine and edit the HTML code directly in source code and view the preview result (HTML live editor).

ASP.NET Core rich text editor with html live editor

ASP.NET Core rich text editor with format on pasting

Paste from Microsoft Word and Excel

The Rich Text Editor offers built-in options to paste content with images from Microsoft Word, Microsoft Outlook and Microsoft Excel to the editor by filtering out tags, attributes, and styles. Additionally, you can control if the content pastes as plain text, cleaned styles, or source-formatting styles.

Integrate with third-party libraries in ASP.NET Core rich text editor

Integrate with third-party libraries

Easy to integrate third-party libraries like spell checker, code mirror, etc., with the RTE to improve the content in ASP.NET Core HTML text editor.

ASP.NET Core rich text editor with print support

Print the WYSIWYG Rich Text Editor content either by using the print option from the toolbar or programmatically with applied format style.

Auto hyperlink of URL in ASP.NET Core rich text editor

Configured to turn text into a hyperlink automatically when user types the URL as a plain text.

ASP.NET Core form validations

The ASP.NET Core Rich Text Editor is a form control that seamlessly supports forms and obtains values on form submission actions. The two types of validation are,

  • Required validation

  • Maximum length validation

Limit content length

Users can restrict the content’s maximum number of characters.

Resizable editor

The ASP.NET Core Rich Text Editor has built-in resizable support that helps widen or shrink the content area.

Insert an image through File Manager

Integrated file manager within the Rich Text Editor to insert/upload images from cloud storage or the server.

Responsive ASP.NET Core rich text editor

Touch-friendly and responsive WYSIWYG editor

The ASP.NET Core Rich Text Editor (mobile HTML editor) recognizes touch gestures, allowing the user to swipe left or right to move the toolbar. The responsive, mobile friendly design provides the best user experience on all mobiles, tablets, and desktop form factors.

ASP.NET Core rich text editor with cross-browser support

Cross-browser support

The ASP.NET Core Rich Text Editor supports cross-browsers and cross-platforms. It also supports ie11 with the help of polyfills.


ASP.NET Core rich text editor with localization support


You can customize all static texts used in the Rich Text Editor control using the localization library.

Show right-to-left in ASP.NET Core rich text editor

Right to Left (RTL)

The ASP.NET Core Rich Text Editor supports right-to-left rendering, allowing the text direction and layout of the text editor to be displayed from right to left. This improves the user experience and accessibility for RTL languages such as Arabic, Farsi, Hebrew, etc.

HTML editor accessibility

  • Fully supports WAI-ARIA accessibility that helps the editor be accessed by on-screen readers and assistive devices.
  • The UI element visuals such as foreground color, background color, line spacing, text, and images are designed based on the WCAG 2.0 standards.
  • Follows WAI-ARIA best practices for implementing all features using accessible keyboard shortcuts.

Developer-friendly APIs

There are sufficient client-side APIs available to optimize the process of editing content.


Frequently Asked Questions

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