We use cookies to give you the best experience on our website. If you continue to browse, then you agree to our privacy policy and cookie policy. Image for the cookie policy date
Unfortunately, activation email could not send to your email. Please try again.
Syncfusion Feedback

Trusted by the world’s leading companies

Syncfusion Trusted Companies


The Blazor Diagram component is a fast and powerful library for visualizing, creating, and editing interactive diagrams. It supports creating flowcharts, organizational charts, mind maps, and more.

Why choose Syncfusion Blazor Diagram?

Blazor Diagram automatic layout.

Automatic layout

Automatically arrange nodes based on a predefined layout algorithm.

Blazor Diagram data binding.

Seamless data binding

Populate diagrams with nodes and connectors created and positioned based on data from data sources. Without having to write any code, easily convert, map, and consume data in any format in the diagram by setting a few properties.

Blazor Diagram interactive editing.

Interactive editing

The Blazor Diagram lets you pan and zoom, snap, undo and redo, stencil, resize, and rotate interactively.

Blazor Diagram adapts to any resolution.

Adapts to any resolution

Diagram has a highly responsive layout and an optimized design for desktops, touchscreens, and phones. It works well on all mobile phones that use iOS, Android, or Windows OS.

Blazor Diagram reusable symbols.

The SymbolPalette displays a collection of palettes. A palette displays a set of nodes and connectors that you can drag and drop into the diagram.

Blazor Diagram template shapes.

Create your own template shapes

Visualize any graphical object using nodes that can be arranged and manipulated on a diagram page at the same time. Diagram allows you to add different kinds of nodes.

Blazor Diagram customizable themes.

Attractive, customizable themes

Cutting-edge design with several built-in themes, such as Fluent, Tailwind CSS, Bootstrap, Material, and Fabric. Utilize the online Theme Studio tool to customize themes of diagram easily.

Blazor Diagram globalization and localization.

Globalization and localization

Enable users from different locales to use the component by formatting dates, currency, and numbering to suit preferences.

Blazor Diagram Code Example

Easily get started with Blazor Diagram using a few simple lines of C# code, as demonstrated below. Also explore our Blazor Diagram Example that shows you how to render and configure the Diagram component in Blazor.

@using Syncfusion.Blazor.Diagram
@using System.Collections.ObjectModel
@using DiagramShapes = Syncfusion.Blazor.Diagram.Shapes
@using DiagramSegments = Syncfusion.Blazor.Diagram.Segments
<SfDiagramComponent Height="600px" Nodes="@NodeCollection" Connectors="@ConnectorCollection" NodeDefaults="@NodeDefaults" ConnectorDefaults="@ConnectorDefaults" ></SfDiagramComponent>
    int connectorCount = 0;
    // Reference to diagram
    SfDiagramComponent diagram;
    // Define diagram's nodes collection
    public DiagramObjectCollection<Node> NodeCollection { get; set; }
    // Define diagram's connector collection
    public DiagramObjectCollection<Connector> ConnectorCollection { get; set; }

    protected override void OnInitialized()

    private void InitDiagramModel()
        NodeCollection = new DiagramObjectCollection<Node>();
        ConnectorCollection = new DiagramObjectCollection<Connector>();
        CreateNode("Start", 50, FlowShapes.Terminator, "Start");
        CreateNode("Init", 140, FlowShapes.Process, "var i = 0;'");
        CreateNode("Condition", 230, FlowShapes.Decision, "i < 10?");
        CreateNode("Print", 320, FlowShapes.PreDefinedProcess, "print(\'Hello!!\');");
        CreateNode("Increment", 410, FlowShapes.Process, "i++;");
        CreateNode("End", 500, FlowShapes.Terminator, "End");
        OrthogonalSegment segment1 = new OrthogonalSegment()
            Type = DiagramSegments.Orthogonal,
            Length = 30,
            Direction = Direction.Right
        OrthogonalSegment segment2 = new OrthogonalSegment()
            Type = DiagramSegments.Orthogonal,
            Length = 300,
            Direction = Direction.Bottom
        OrthogonalSegment segment3 = new OrthogonalSegment()
            Type = DiagramSegments.Orthogonal,
            Length = 30,
            Direction = Direction.Left
        OrthogonalSegment segment4 = new OrthogonalSegment()
            Type = DiagramSegments.Orthogonal,
            Length = 200,
            Direction = Direction.Top
        CreateConnector("Start", "Init");
        CreateConnector("Init", "Condition");
        CreateConnector("Condition", "Print");
        CreateConnector("Condition", "End", "Yes", segment1, segment2);
        CreateConnector("Print", "Increment", "No");
        CreateConnector("Increment", "Condition", null, segment3, segment4);

    private void CreateConnector(string sourceId, string targetId, string label = default(string), OrthogonalSegment segment1 = null, OrthogonalSegment segment2 = null)
        Connector diagramConnector = new Connector()
            ID = string.Format("connector{0}", ++connectorCount),
            SourceID = sourceId,
            TargetID = targetId

        diagramConnector.Type = Segments.Orthogonal;
        if (segment1 != null)
            diagramConnector.Segments = new DiagramObjectCollection<ConnectorSegment>() { segment1, segment2 };
        if (label != default(string))
            var annotation = new PathAnnotation()
                Content = label,
                Style = new TextShapeStyle() { Fill = "transparent" }
            diagramConnector.Annotations = new DiagramObjectCollection<PathAnnotation>() { annotation };


    private void NodeDefaults(IDiagramObject obj)
        Node node = obj as Node;
        node.Width = 140;
        node.Height = 50;
        node.OffsetX = 300;
        node.Style = new ShapeStyle() { Fill = "#357BD2", StrokeColor = "white" };
    private void ConnectorDefaults(IDiagramObject obj)

        Connector connector = obj as Connector;
        connector.Type = DiagramSegments.Orthogonal;
        connector.TargetDecorator = new Decorator() { Shape = DecoratorShapes.Arrow, Width = 10, Height = 10 };
    private void CreateNode(string id, double y, FlowShapes shape, string label, bool positionLabel = false)
        ShapeAnnotation annotation = new ShapeAnnotation() { Content = label,
            Style = new TextShapeStyle()
                Color = "white",
                Fill = "transparent"
        if (positionLabel)
            annotation.Margin = new Margin() { Left = 25, Right = 25 };

        Node diagramNode = new Node()
            ID = id,
            OffsetY = y,
            Shape = new FlowShape() { Type = Shapes.Flow, Shape = shape },
            Annotations = new DiagramObjectCollection<ShapeAnnotation>() { annotation }


The Blazor Diagram component provides all the standard flowchart shapes as ready-made objects, making it is easy to add them to a diagram surface in a single call.

Flowchart Diagram created with built-in flowchart shapes available in Blazor Diagram component.

Organizational chart in Blazor Diagram component.

Organizational chart

A built-in automatic layout algorithm is specifically designed for organizational charts to arrange parent and child node positions automatically.

Mind map

Another built-in automatic layout algorithm is designed for mind map diagrams, allowing users to define which node should be at the center and which nodes should be placed around it in the diagram surface.

Mind map in Blazor Diagram.


Visualize any graphical object using nodes, which can be arranged and manipulated at the same time on a Blazor diagram page. With nodes,

  • Use many predefined standard shapes.
  • Create and add custom shapes easily.
  • Fully customize the appearance of a node.
  • Design a node UI template and reuse it across multiple nodes.


A connector represents a relationship between two nodes. Some of its key features like connector types, bridging, and more are listed below.

Different types of connectors available in Blazor Diagram component.


The Blazor Diagram component provides straight, orthogonal, polyline, and curved connector types. Choose any of these based on the type of diagram or the relationship between the connected nodes.

Connector line jump behavior in Blazor Diagram component.

Bridging or line jumps

Use bridging (line jumps) to illustrate a connector’s route, making it easy to see where connectors overlap each other in a dense diagram.

Predefined arrowheads in Blazor Diagram component illustrate flow direction in the diagram.


Use different types of predefined arrowheads to illustrate flow direction in flowchart diagrams. Also build custom arrowheads.

Connector appearance customization in Blazor Diagram component.


Like nodes, the connector look and feel can also be customized. The Blazor Diagram component provides a rich set of properties to customize connector color, thickness, dash and dot appearance, rounded corners, and even decorators.

Ports (connection points)

Attach connectors to specific places on a node through different types of ports or connecting points.

Connect to specific places on a node using ports in the Blazor Diagram component.


Additional information can be shown by adding text or labels on nodes and connectors.

Additional information can be shown on nodes and connectors using labels in Blazor Diagram library.


Add and edit text at runtime and mark it read-only if it should not be edited.

Add multiple labels on nodes and connectors using Label feature in Blazor Diagram component.

Multiple labels

Add any number of labels and align them individually.

Align labels inside or outside a node in Blazor Diagram component.


Labels include sophisticated alignment options: place them inside or outside a node, or at the source or target end of a connector. Automatically align labels when a node or connector moves.

Interactive features

Use interactive features to improve the editing experience of a Blazor diagram at runtime. Furthermore, easily edit a Blazor diagram with mouse, touchscreen, or keyboard interfaces.

Select and drag the nodes or connectors using handlers in Blazor Diagram library.

Select and drag

Select one or more nodes, connectors, or annotations and edit them using thumbs or handlers.

Select and resize nodes using handlers in Blazor Diagram library.


Resize a node in eight different directions and lock a node’s aspect ratios to maintain its shape. Also, resize multiple objects at the same time.

Select and rotate nodes using handlers in Blazor Diagram library.


Rotate selected nodes from 0 to 360 degrees.

Undo and redo the recent changes using history manager feature in Blazor Diagram library.

Undo and redo

Don’t worry when you edit by mistake—undo and redo commands help to easily correct recent changes.

Cut, copy, and paste selected objects within a diagram using the clipboard feature in Blazor Diagram library.


Cut, copy, paste, or duplicate selected objects within and across Blazor diagrams.

Move objects to the top or bottom of the diagram using the z-order feature in Blazor Diagram.


When multiple objects overlap, the z-order controls which object is at the top and which is at the bottom.

Align nodes and connectors with the nearest gridlines or objects in Blazor Diagram library.


Precisely align nodes, connectors, and annotations while dragging them just by snapping to the nearest gridlines or objects.

Combine multiple nodes into a group node in Blazor Diagram library.


You can combine multiple nodes into a group and then interact with them as a single object. Nested groups are also possible.

Quick commands can be shown as buttons near a selector in Blazor Diagram library.

Quick commands

Frequently used commands like delete, connect, and duplicate can be shown as buttons near a selector. This makes it easy for users to quickly perform those operations instead of searching for the correct buttons in a toolbox.


Our Blazor Diagram library has predefined alignment commands that enable you to align selected objects, nodes, and connectors with respect to the selection boundary.

Arrange selected objects in equal intervals using spacing commands in Blazor Diagram library.

Spacing commands

Spacing commands enable you to place selected objects on the diagram at equal intervals from each other.

Resize selected objects to have equal sizes in Blazor Diagram library.

Sizing commands

Use sizing commands to equally size selected nodes with respect to the first selected object.

Align selected objects horizontally or vertically by using align commands in Blazor Diagram library.

Align commands

All the nodes or connectors in the selection list can be aligned at the left, right, or center horizontally, or aligned at the top, bottom, or middle vertically with respect to the selection boundary.

Automatic layout

Use automatic layouts to arrange nodes automatically based on a predefined layout algorithm. Features built-in hierarchical tree, organizational tree, and mind map layouts.

Build hierarchical tree layout using Blazor Diagram component.

Host reusable nodes inside the symbol palette using the symbol palette feature in Blazor Diagram library.

Symbol palette

Includes a gallery of stencils, reusable symbols, and nodes that can be dragged onto the surface of a Blazor diagram.

Overview panel

The overview panel allows you to improve the navigation experience when exploring large diagrams. It displays a small preview of the full diagram page that allows users to zoom and pan within it.

Improve the navigation experience with larger diagrams by using the overview panel in Blazor Diagram.

Drawing tools

Draw all kinds of built-in nodes and connect them with connectors interactively by just clicking and dragging on the drawing area.

Draw nodes and connectors interactively using Blazor Diagram library.

Zooming in and out in Blazor Diagram component.

Zoom and pan tools

View a large diagram closely or assume a wider view by zooming in and out. Also, navigate from one region of a diagram to another by panning across the Blazor diagram.


You can export a diagram to different image files such as PNG, JPEG, BMP, and SVG.

Export the diagram to different image formats using Blazor Diagram.

Print diagrams from the browser using Blazor Diagram.


Print diagrams from the browser. Users can also customize the page size, orientation, and page margin, and fit a diagram to a single page.


Save the Blazor diagram state in JSON format and load it back later for further editing using the serializer.

Save and load a diagram by serializing it to JSON format using Blazor Diagram component.


In addition to all the features listed thus far, there many more that enhance the diagramming experience.

Align objects using gridlines in Blazor Diagram component.


Gridlines provide guidance when trying to align objects.

Define page-like appearance on the drawing surface using Blazor Diagram component.

Page layout

Give a page-like appearance to the drawing surface using page size, orientation, and margins.

Additional information about a node can be viewed by using tooltips in Blazor Diagram.


Use tooltips to provide additional information about a node.

Use context menu feature to map frequently used commands in Blazor Diagram.

Context menu

Easily map frequently used commands to the context menu.

Additional features

Keyboard navigation in Blazor Diagram.

Keyboard navigation

The Blazor Diagram control ensures that every cell is accessible using the keyboard. Major features like sort, select, and edit can be performed using keyboard commands alone; no mouse interaction is required. This helps in creating highly accessible applications using this control.

Blazor Diagram developer-friendly APIs.

Developer-friendly APIs

Developers can have full control over the UI and behavior of the event calendar through its built-in, developer-friendly APIs. It allows you to customize even the complex Diagram functionalities with ease.

Struggling to decide on the right product?

Our comprehensive competitor comparison of Blazor components will guide you to the perfect choice.

tick-mark 85+ UI components
tick-mark 960+ interactive Blazor demos
tick-mark 1.8M+ downloads
Blazor competitive image

Other supported frameworks

The Diagram component is also available for Angular, React, Vue, and JavaScript frameworks, built from its own TypeScript libraries. Check out the different Diagram platforms from the following links:

Supported browsers

The Blazor Diagram works well with all modern web browsers such as Chrome, Firefox, Microsoft Edge, Safari, and Opera.

Supported browsers in Blazor Diagram.

See how our components can be transformed into beautiful and efficient apps

Blazor Components – 85+ UI and DataViz Components

Frequently Asked Questions

  • Visualize, create, and edit interactive diagrams.
  • Blazing fast load time, rich UI interactions, and keyboard navigation.
  • Load a wide range of nodes with optimum performance.
  • Flowchart diagram support, many built-in shapes, and flexible data binding.
  • Easily arrange diagram components in layouts such as organization chart, mind map, radial tree, and hierarchical tree.
  • One of the best Blazor Diagram libraries on the market, offering a feature-rich UI to interact with the software.
  • Simple configuration and API.
  • Supports all modern browsers.
  • Mobile-touch friendly and responsive.
  • Extensive demos and videos to help you learn quickly and get started.

We do not sell the Blazor Diagram separately. It is only available for purchase as part of the Syncfusion team license. This contains over 1,800 components and frameworks, including the Blazor Diagram. The price of the team license starts at $395 per month for 5 developers, and includes support and updates until the subscription expires. In addition, we might offer discounts based on currently active promotions. Please contact our product specialists today to see if you qualify for any additional discounts.

You can find our Blazor Diagram demo, which demonstrates how to render and configure the Diagram.

No, our 1,800+ components and frameworks for web, mobile, and desktop, including our Blazor Diagram, are not sold individually. They are only available as part of a team license. However, we have competitively priced the product, so it only costs a little bit more than what some other vendors charge for their Diagram component alone. We have also found that, in our experience, our customers usually start off using one of our products and then expand to several products quickly, so we felt it was best to offer all 1,800+ components and frameworks for a subscription fee that starts at $395 per month for a team of 5 developers. Additionally, we might be able to offer discounts based on currently active promotions. Please contact our product specialists today to see if you qualify for any additional discounts.

No, this is a commercial product and requires a paid license. However, a free community license is also available for companies and individuals whose organizations have less than $1 million USD in annual gross revenue, 5 or fewer developers, and 10 or fewer total employees.

A good place to start would be our comprehensive getting started documentation.

Our Customers Love Us

Having an excellent set of tools and a great support team, Syncfusion reduces customers’ development time.
Here are some of their experiences.

Rated by users across the globe

Transform your applications today by downloading our free evaluation version
Download Free Trial No credit card required.


Greatness—it’s one thing to say you have it, but it means more when others recognize it. Syncfusion is proud to hold the following industry awards.

Up arrow icon
Live Chat Icon For mobile