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.NET Excel Library - Overview

The Syncfusion Excel Library (Essential XlsIO) is a feature-rich and high-performance .NET Excel library that allows you to add robust Excel functionalities to any .NET application. It allows you to create, read, and edit Excel documents programmatically without Microsoft Office dependencies. This library also offers functionality to import and export data, visualize data as charts, tabulate data, calculate with simple and complex formulas, format cells and values, sort and filter data, protect Excel files, and more.

Overview Diagram of .NET Excel Library.

General information

Blazing-fast performance

Optimized for a server environment where speed and low memory usage are critical. It works much faster and consumes less memory than Office automation libraries.

No server deployment fees

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

Easy migration from Office automation

It’s easy to migrate existing Office automation code to Excel Library since the APIs are very similar.

Compatible with Excel versions 97 to 2019

This library reads and writes all popular Excel file formats including XLS and XLSX. A file can be opened in one format and saved in another format.

Powerful and comprehensive API

The comprehensive API makes it possible to create richly formatted Excel files with elements like text, numbers, formatting, images, charts, and pivot tables. It is also possible to extract any desired piece of information from an existing workbook.

Start reports with Excel and finish with Excel Library

Reports can be designed using Microsoft Excel, and Excel Library can be used to dynamically populate them with data. Final reports can then be saved to an Excel file or exported to other supported formats.


Import data.

Import data

Easily import data from common data sources, like arrays, data tables, collection objects, and HTML tables, into an Excel worksheet.

Export data.

Export data

Data in an existing worksheet can also be exported to data tables, collection objects, and nested classes.



Data sorting can be performed based on cell value, cell color, and font color using multiple sorting algorithms.



Excel Library supports various filter options like top, top10, and percent, with different filter types such as custom, combination, dynamic, color, icon, and advanced filters.

Data validation.

Data validation

Cell data validations can be applied with operators, alert messages, custom formulas, and dropdown lists.

Efficient calculations

Built-in functions.

Built-in functions

The built-in calculation engine quickly evaluates formula cell values during runtime. It supports over 400 Excel functions.

Named ranges.

Named ranges

Named ranges can be used in formulas as substitutes for cell references. The built-in name manager allows adding, editing, and deleting names.

Template markers

Import hierarchical data.

Import hierarchical data

Import hierarchical data from multiple tables.

Import images.

Import images

Import JPEG, PNG, BMP, TIFF, and GIF images in customized formats.

Dynamic formatting

Dynamic formatting

Apply conditional formats to template marker ranges with data bars, color scales, and icon sets.

Excel charting

Chart types.

80+ chart types

Create and edit all types of Excel charts including Excel 2016 charts.

Custom charts.

Custom charts

Create charts with different types of series.



Create a tiny chart in a worksheet cell that provides visual representation of data.

Chart to image.

Chart to image

Charts can also be converted to images using just a few lines of code.

Conditional formatting

Data bars.

Data bars

Use data bars to easily spot larger and smaller numbers.

Color scales.

Color scales

Use color scales to create visual effects for comparing a cell value with values in a range of cells.

Icon sets.

Icon sets

Icon sets distinguish data in three or five categories based on the threshold value.

Excel formatting

Formatting options

Formatting options

Excel Library supports various formatting options like number formats, alignments, font settings, borders, colors, and rich text that make data more readable.



Create custom styles or apply built-in styles to cell ranges or tables.

Row column manipulation.

Row and column manipulation

Excel Library performs various cell-level operations like resizing rows and columns, hiding and showing rows and columns, adding or deleting rows and columns, grouping and ungrouping, and subtotaling.

Page setup.

Page setup

Change page settings like orientation, paper size, scaling, margins, print area, print titles, and the header and footer.


Pivot tables.

Pivot tables

Create and edit pivot tables and pivot charts with just a few lines of code. General filter options, such as page filters, row filters, and column filters, with various pivot table visibility settings and custom sorting are supported. Layout and inline formatting are also supported in all the three formats (compact, outline, and tabular).

Pivot charts.

Pivot charts

Create pivot charts from pivot tables to visualize summarized data with legends, data labels, chart titles, axis titles, and more.

Conversion and printing

Convert Excel.

Convert Excel

Convert Excel documents to ODS, HTML, images, and JSON. Excel charts can also be converted to images.

Print Excel.

Print Excel documents from code with various print settings and without dependency on Microsoft Excel or Adobe Reader.


Encryption and decryption.

Encryption and decryption

Read and write password-protected Excel documents with various algorithms like SHA 128, SHA256, or SHA512.

Excel protection.


Enable and disable workbook and worksheet protections and lock cells.


Form controls.

Form controls

Create and edit text box, option button, check box, and combo box controls to enable user-friendly worksheets.



Create and edit 150+ AutoShapes in Excel.



Create and edit comment shapes with rich-text format and various fill options including gradient styles.

Feature Matrix

Workbook Features XLSX XLS
Create an Excel workbook from scratch or modify an existing workbook. Yes Yes
Open an existing Excel workbook from file system or stream. Yes Yes
Save Excel workbook to a local file, stream, or stream it to the client browser. Yes Yes
Read worksheets on demand when Excel file contains multiple worksheets. Yes Yes
Hide and unhide worksheets. Yes Yes
Add or extract custom XML documents. Yes Yes
Add or modify document properties. Yes Yes
Import and Export XLSX XLS
Import data from data tables, data columns, data views, arrays, collection objects, and HTML tables to worksheets. Yes Yes
Import data into a preformatted template using template markers. Yes Yes
Importing large amounts of data with minimal memory consumption can be achieved using the import-on-save option. Yes Yes
Export data from a worksheet to data table by triggering an event to skip any row, change any value, and continue without any action. Yes Yes
Export data from worksheets to collection objects. Yes Yes
Import data from various external sources like Microsoft Access, SQL Server, and Excel, which maintain the connection to refresh data dynamically. Yes No
Import or export hyperlinks. Yes Yes
Formulas XLSX XLS
Read and write Excel formulas. Yes Yes
Add or modify named ranges in workbook and worksheet levels. Yes Yes
Perform calculation for a range of cells using named ranges. Yes Yes
Apply or modify Excel formula auditing settings. Yes Yes
Enable automatic and manual calculation options. Yes Yes
Trace relationships between cells and formulas through dependent and precedent ranges. Yes Yes
Creation and manipulation of Excel 2D charts. Yes Yes
Creation and manipulation of Excel 3D charts. Yes Yes
Creation and manipulation of custom charts. Yes Yes
Creation and manipulation of sparklines. Yes NA
Creation and manipulation of Excel 2016 charts. Yes NA
Pivot Tables
Creation and manipulation of pivot tables (while saving as XLS format, the pivot table is preserved as-is from the input XLS file). Yes No
Apply various pivot table settings like page filter, row filter, and column filter (while saving in XLS format, pivot table is preserved as-is from the input XLS file). Yes No
Supports pivot table settings such as visibility of field list, collapse button, field caption and field option, and header captions. Yes No
Apply custom sorting and direction sorting for pivot table fields. Yes No
Supports compact layout, tabular layout, and outline layout in pivot tables. Yes No
Apply cell formatting in pivot tables. Yes No
Worksheet Features XLSX XLS
Creation and manipulation of conditional formatting (supports icon sets, data bars, color scales, specific dates in XLSX, top-bottom rules, above-below average, and formats unique/duplicate values). Yes Yes
Auto fit or resize rows and columns. Yes Yes
Apply or modify number formats. Yes Yes
Apply or modify fill settings. Yes Yes
Apply or modify font settings. Yes Yes
Apply or modify cell border settings. Yes Yes
Apply or modify all the cell text alignments. Yes Yes
Excel 2007 themes. Yes Yes
Add or copy worksheets within or across workbooks. Yes Yes
Copy a range to another range across worksheets. Yes Yes
Copy a range with different copy options. Yes Yes
Move a range to another range across worksheets. Yes Yes
Creation and manipulation of data validation. Yes Yes
Apply or modify AutoFilters to filter worksheet data. Yes Yes
Apply or modify color or icon filters to filter worksheet data. Yes Yes
Apply or modify data sorting. Yes Yes
Find and replace data. Yes Yes
Find average, maximum, minimum, and sum values of the numeric cells. Yes Yes
Row and Column Manipulation
Apply and modify view settings to freeze, unfreeze, and split panes. Yes Yes
Hide and unhide rows and columns. Yes Yes
Merge and unmerge cells. Yes Yes
Trim empty rows and columns at the top or bottom. Yes Yes
Insert and delete images in worksheets. Yes Yes
Apply or modify background image in a worksheet. Yes Yes
Add, remove, and modify hyperlinks. Yes Yes
Group or ungroup rows and columns. Yes Yes
Add or modify subtotals of grouped data. Yes Yes
Add and delete OLE objects. Yes No
Open and save encrypted and decrypted documents. Yes Yes
Protect and unprotect workbooks. Yes Yes
Protect and unprotect worksheets. Yes Yes
Lock and unlock cells for write protection. Yes Yes
Page Setup
Set and get header and footer settings. Yes Yes
Apply and modify horizontal and vertical page breaks. Yes Yes
Apply and modify custom page breaks. Yes Yes
Apply various page setup options like paper size, orientation, scaling, and margins. Yes Yes
Apply print settings. Yes Yes
Print workbook with custom page settings. Yes Yes
Creation and manipulation of autoshapes. Yes Yes
Creation and manipulation of check boxes. Yes Yes
Creation and manipulation of combo boxes. Yes Yes
Creation and manipulation of comments. Yes Yes
Creation and manipulation of text boxes. Yes Yes
Creation and manipulation of group shapes. Yes Yes
Create and edit macros Yes Yes
Conversion XLSX XLS
Convert an entire Excel worksheet into a single image. Yes Yes
Convert a specific range of an Excel worksheet into a single image. Yes Yes
Convert Excel charts to images (.NET Framework 4.0 and above). Yes Yes
Convert Excel document to ODS (open document spreadsheet). Yes Yes
Convert an entire Excel workbook or single worksheet or specified range to JSON file. Yes Yes



Syncfusion’s file format components helped me create the reports I needed, fast. – J. Pereira, Software Developer.

The libraries have been built from scratch and refined for more than a decade to provide blazing-fast performance, comprehensive API, and compatibility across the latest and older versions of these files.

CONTINUE READING View all Customer Stories


Syncfusion File Format Libraries - Manipulate Excel, Word, PowerPoint, and PDF files

Read and write Excel, Word, PDF, and PowerPoint files. Also includes integrated visualization capabilities. Advanced features include support for pivot tables, pivot charts, mail-merge, and extensive formatting.


Succinctly Series: Statistics Using Excel Succinctly

Succinctly Series: Statistics Using Excel Succinctly

- by Charles Zaiontz


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.

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