Blazor RichTextEditor Component in WebAssembly App using Visual Studio

9 Jan 20243 minutes to read

This article provides a step-by-step instructions for building Blazor WebAssembly App with Blazor RichTextEditor component using Visual Studio.


Create a Blazor WebAssembly App in Visual Studio

You can create a Blazor WebAssembly App using Visual Studio via Microsoft Templates or the Syncfusion Blazor Extension.

Install Syncfusion Blazor RichTextEditor and Themes NuGet in the App

To add Blazor RichTextEditor component in the app, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search and install Syncfusion.Blazor.RichTextEditor and Syncfusion.Blazor.Themes. Alternatively, you can utilize the following package manager command to achieve the same.

Install-Package Syncfusion.Blazor.RichTextEditor -Version 25.2.3

Install-Package Syncfusion.Blazor.Themes -Version 25.2.3


Syncfusion Blazor components are available in Refer to NuGet packages topic for available NuGet packages list with component details.

Register Syncfusion Blazor Service

Open ~/_Imports.razor file and import the Syncfusion.Blazor and Syncfusion.Blazor.RichTextEditor namespace.

@using Syncfusion.Blazor
@using Syncfusion.Blazor.RichTextEditor

Now, register the Syncfusion Blazor Service in the ~/Program.cs file of your Blazor WebAssembly App.

using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
using Syncfusion.Blazor;

var builder = WebAssemblyHostBuilder.CreateDefault(args);

builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });

await builder.Build().RunAsync();

Add stylesheet and script resources

The theme stylesheet and script can be accessed from NuGet through Static Web Assets. Reference the stylesheet and script in the <head> of the main page as follows:

  • For Blazor WebAssembly app, include it in the ~/index.html file.
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
    <script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>


Check out the Blazor Themes topic to discover various methods (Static Web Assets, CDN, and CRG) for referencing themes in your Blazor application. Also, check out the Adding Script Reference topic to learn different approaches for adding script references in your Blazor application.

Add Blazor RichTextEditor component

Add the Syncfusion Blazor RichTextEditor component in the ~/Pages/Index.razor file.

<p>Rich Text Editor allows to insert images from online source as well as local computer where you want to insert the image in your content.</p>
<p><b>Get started Quick Toolbar to click on the image</b></p>
<p>It is possible to add custom style on the selected image inside the Rich Text Editor through quick toolbar.</p>
  • Press Ctrl+F5 (Windows) or +F5 (macOS) to launch the application. This will render the Syncfusion Blazor RichTextEditor component in your default web browser.

Blazor RichTextEditor Component