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.NET Core Excel framework is a high-performance and feature-rich to work with Microsoft Excel. This framework has an Excel creation and editing library that allows you to create, read, and edit Microsoft Excel files in any .NET application. It offers Excel-inspired spreadsheet UI controls to create, edit, view, and format Excel documents. Its powerful conversion APIs make it easy to convert Excel files to HTML, images, and more.

Why choose Syncfusion .NET Core Excel Library?

.NET Core Excel deployment fees.

No server deployment fees

There are no distribution fees, per-server licensing fees, or royalties, which makes Excel Library very cost-effective.

.NET Core Excel blazing fast performance.

Blazing-fast performance

It is optimized for usage in a server environment where speed and low memory usage are critical.

.NET Core Excel powerful APIs.

Powerful and comprehensive API

All the elements in a typical Excel document such as text, formatting, images, shapes, and tables are accessible through a comprehensive set of APIs.

.NET Core Excel library.

Proven Excel library

Over more than 15 years, Syncfusion’s Excel Library (Essential XlsIO) has become a mature and proven product.

.NET Core Excel fully documented.

Fully documented

The Syncfusion’s Excel Library comes with extensive documentation, knowledge bases, and samples.

Cross platform support in .NET Core Excel.


Use a single API across all platforms.

Excel - creating and editing APIs

Syncfusion's Excel Library (Essential XlsIO) is a high-performance .NET Core Excel library that allows users to create, read, edit, and protect Excel documents in .NET Core applications without Microsoft Office or interop dependencies.

Import and export in .NET Excel.

Import and export

Import data from various data sources, collection objects, and HTML tables. Also, export data to data tables, collection objects, and nested classes.

Excel charts.

Excel charting

Excel Library supports 80+ charts to visualize data. Similarly, sparklines are supported to visualize data within a cell.

Excel formulas.


More than 400 Excel functions are supported to evaluate formula cells quickly. Add-in functions, external formulas, and an array of formulas are also supported.

Excel template markers.

Template markers

Import data to Excel worksheets like mail merge in a Word document. Customized data importing is also supported.

Excel formatting.


Use various cell and text formatting options along with advanced conditional formatting features to modify the appearance of the data.

Excel data processing.

Data processing

Perform various kinds of data processing such as data validation, sorting, and filtering.

Pivot tables.

Pivot tables

Pivot tables and pivot charts are widely used in the Spreadsheet control due to their ease-of-use in summarizing data. Syncfusion’s Excel Library allows you to create and edit them with a few lines of code.

Excel protection view.


Encrypt or decrypt password-protected Excel files. Also, protect the editing of workbooks, worksheets, and cells.

.NET Core Excel shapes.


Create and edit various form controls, autoshapes, and comments.

.NET Core Excel Code Example

Easily get started with the .NET Core Excel Framework using a few simple lines of C# code example as demonstrated below. Also explore our .NET Core Excel Library Example that shows you how to render and configure the .NET Core Excel.

//New instance of ExcelEngine is created 
//Equivalent to launching Microsoft Excel with no workbooks open
//Instantiate the spreadsheet creation engine
ExcelEngine excelEngine = new ExcelEngine();

//Instantiate the Excel application object
IApplication application = excelEngine.Excel;

//Assigns default application version
application.DefaultVersion = ExcelVersion.Excel2013;

//A existing workbook is opened.              
string basePath = _hostingEnvironment.WebRootPath + @"\XlsIO\Sample.xlsx";              
FileStream sampleFile = new FileStream(basePath, FileMode.Open);

IWorkbook workbook = application.Workbooks.Open(sampleFile);

//Access first worksheet from the workbook.
IWorksheet worksheet = workbook.Worksheets[0];

//Set Text in cell A3.
worksheet.Range["A3"].Text ="Hello World";

//Defining the ContentType for excel file.
string ContentType = "Application/msexcel";

//Define the file name.
string fileName = "Output.xlsx";

//Creating stream object.
MemoryStream stream = new MemoryStream();

//Saving the workbook to stream in XLSX format

stream.Position = 0;

//Closing the workbook.


//Dispose the Excel engine

//Creates a FileContentResult object by using the file contents, content type, and file name.
return File(stream, ContentType, fileName);

Create and manipulate Excel on many platforms

Unlock the power of Excel creation and manipulation on any platform with our Excel Framework. It empowers you to easily create, read, and manipulate Excel documents programmatically across various platforms (applications), including .NET, Blazor, .NET MAUI, .NET Core, Flutter, WinUI, Xamarin, and UWP. Explore the platform-wise features of our Excel creation and manipulation library.

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Blazor Excel Library.Blazor
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.NET MAUI Excel Library..NET MAUI
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Flutter Excel Library.Flutter
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Xamarin Excel Library.Xamarin
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Spreadsheet viewer and editor

The Spreadsheet control provides a Microsoft Excel-like control with major features of Microsoft Excel,
including editing, formulas, charting, importing, and exporting.

.NET Excel High performance.

High performance

Open and save large Excel files in less time with minimal memory consumption. Experience smooth scrolling even with many cells in a view.

Open and save.

Open and save

Import and edit existing Excel files in the Spreadsheet control. Spreadsheets can be exported to XLS, XLSX, CSV, and PDF file formats.

Excel Charts.


Spreadsheet supports charts and sparklines. Visualize data easily.



More than 400 Excel-compatible functions are supported, such as cross-sheet references, named ranges, and formulas.



The Spreadsheet control provides a variety of text and number formatting options along with conditional formatting to improve the appearance and effectiveness of spreadsheet.

Data virtualization.

Data virtualization

The Spreadsheet control supports on-demand data loading when bound to data sources. It improves initial loading time by requesting only the visible data from the data source.

View Excel documents in any platform

Our Excel Framework offers Spreadsheet components tailored for web, desktop applications, providing a comprehensive ecosystem and allowing you to integrate Excel viewing functionality seamlessly. Explore the features of our Spreadsheet components by platform.

Excel Conversions

Excel to PDF conversion in .NET Core.

Excel to PDF

Convert an Excel workbook or worksheet to PDF format. Use various customization options, like embedding fonts, ignoring empty pages or worksheets, showing or hiding headers, and footers.

Worksheet to Image conversion in .NET Core.

Worksheet to Image

Worksheets can be converted to BMP, JPEG, PNG, and other image formats, with content such as data, formatting, charts, tables, and shapes.

Excel to CSV conversion in .NET Core.

Excel to CSV/TSV

Convert spreadsheet data to CSV and TSV formats to generate, lightweight reports.

Excel to HTML conversion in .NET Core.

Excel to HTML

Dynamically render an Excel workbook or worksheet as an HTML file.

Excel to ODS conversion in .NET Core.

Excel to ODS

Save Excel files in ODS formats to use in applications like OpenOffice and Google Sheets.

Excel to SpreadsheetML conversion in .NET Core.

Excel to SpreadsheetML

SpreadsheetML is easy to work with and designed to be human readable and editable. Convert Excel files to SpreadsheetML using Syncfusion’s Excel Library.

Excel to JSON conversion in .NET Core.

Excel to JSON

Convert an Excel workbook or worksheet to JSON file in schema and non-schema formats.

Frequently Asked Questions

The Syncfusion .NET Core Excel Framework provides the following features:

  • Create, read, edit, and view Excel files with just a few lines of code.
  • Utilize top features: charts, formulas, tables, pivot tables, data validation, data import and export, conditional formatting, shapes, and security.
  • Import data into a customized format using Template Markers.
  • Perform quick evaluation with 400+ functions.
  • Convert Excel files into ODS, HTML, and images.
  • One of the best .NET Core Excel libraries on the market, offering a rich set of APIs to interact with the software.
  • Extensive demos, documentation, and videos to learn quickly and get started with Syncfusion XlsIO.

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.

Apart from .NET Core, the Syncfusion Excel framework supports platforms for web (Blazor, Flutter, ASP.NET MVC, and ASP.NET Web Forms), mobile (.NET MAUI, Flutter, Xamarin, and UWP), and desktop (Windows Forms, WPF, WinUI, .NET MAUI, Flutter, Xamarin, and UWP).

You can find our .NET Core Excel Framework demo, which demonstrates how to render and configure the .NET Core Excel.

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.

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