Convert EXCEL to XLSX in C# .NET or Online EXCEL Converter

Convert EXCEL to PDF/Word/HTML/PPTX in C#

Convert your EXCEL files to other popular documents formats such as PDF, HTML, PowerPoint presentations and Word processing documents using C# .NET code. Load the source EXCEL file and save it as a converted document in some other document format such as PDF, DOCX, HTML or PPTX.

Create Converter object and pass source EXCEL file to it
Instantiate the proper ConvertOptions class e.g. (PdfConvertOptions for conversion to PDF, WordProcessingConvertOptions for conversion to Word formats, MarkupConvertOptions for conversion to HTML, PresentationConvertOptions for conversion to PowerPoint formats)
Call Convert method of Converter class instance for conversion to PDF/HTML/PPTX or Word document format

Auto-Cache Converted XLSX Document

In certain situations, the converted document may have a larger file size and require additional time for conversion. By default, the cached converted documents are stored locally. However, with Conholdate.Total for .NET, you can take advantage of the custom cache implementation feature using the iCache interface. This allows you to efficiently manage and customize the storage of conversion results according to your specific requirements. By implementing this feature, you can significantly improve the repetitive conversion process.

The .NET Excel conversion library offers comprehensive support for converting to and from password protected archives. Additionally, it provides the ability to compress the conversion results into various archive formats, including ZIP, RAR, 7Z, TAR, GZ, and BZ2.

Convert EXCEL to XLSX with Watermarks

Accurately convert EXCEL to XLSX exactly as the original source file and apply text or image watermarks to XLSX pages using C# .NET.

Create Converter object to convert EXCEL document
Create new instance of WatermarkOptions class
Specify watermark properties (color, width, text, image etc)
Instantiate the proper ConvertOptions class
Set Watermark property of the ConvertOptions instance
Call Convert method of Converter class instance for conversion to XLSX

Extract EXCEL Document Information

Discover valuable file-format specific information using the document information extraction feature. Obtain basic details from the source document file (EXCEL) and extract additional data, including project start and end dates from Microsoft Project files, printing restrictions from PDF documents, and a list of enclosed folders from Outlook data files.

Easily convert popular document file formats across various operating systems including Windows, Linux, and macOS. Seamlessly utilize platforms such as Windows Azure, Mono, and Xamarin for efficient document conversions.

Convert JSON File to EXCEL in .NET

Converting a JSON file to EXCEL in .NET is now easier with Conholdate.Total for .NET APIs. Easily leverage JSON files as data sources and precisely convert them to Excel spreadsheet format (EXCEL) using just a few lines of C# code, all without the need for external software.

Create Converter object to convert JSON file
Instantiate SpreadsheetConvertOptions class
Call Convert method of Converter class instance for conversion to XLSX

Remote EXCEL Conversion Simplified

With Conholdate.Total for .NET, developers can follow a simple method to load and convert EXCEL documents from remote locations and cloud-based document storage resources. Supported sources include Amazon S3, Microsoft Azure Blob, FTP, local disk, stream, and simple URLs. By specifying the appropriate method to obtain the remotely located document stream, programmers can easily pass it on to the Converter class as a constructor, enabling seamless conversion capabilities.

The Conholdate.Total for .NET APIs seamlessly integrate with various application types based on the .NET Framework 2.0 or later, including Windows Forms, ASP.NET, WPF, and WCF. Enjoy the native compatibility and leverage the APIs’ functionality within your preferred .NET application environment.

Frequently Asked Questions (FAQs)

Can I convert EXCEL files to XLSX online without paying anything?

Yes. You can easily convert EXCEL files to XLSX online using our completely free converter. It requires no software installation or user registration—just upload your file, convert and download your XLSX.

How do I convert EXCEL files to XLSX using C# code?

Converting EXCEL files to XLSX using C# is straightforward with the Conholdate.Total for .NET APIs. We provide practical, ready-to-use code samples and clear documentation to simplify the integration into your applications.

Do I need to have Microsoft EXCEL installed to perform EXCEL-to-XLSX conversions with C#?

No. you don’t need Microsoft EXCEL installed. Conholdate.Total APIs operate independently, allowing you to convert EXCEL documents directly to XLSX format within your .NET applications without EXCEL itself.

How quickly does your online EXCEL-to-XLSX converter work?

Our online converter is built for speed and efficiency. Most conversions take just a few seconds—even when dealing with larger or more complex EXCEL files.

Will the online converter preserve formulas and hyperlinks from my EXCEL files?

Our online EXCEL-to-XLSX converter keeps all your hyperlinks, images, charts and formatting intact. However, EXCEL formulas are converted into their resulting values in the final XLSX, ensuring an accurate and readable document.

Can I automate the EXCEL-to-XLSX conversion on my own servers?

Definitely! You can automate the EXCEL-to-XLSX conversion process using Conholdate.Total for .NET. It’s perfect for handling batch jobs, scheduled conversions, or integrating seamlessly into your backend workflows.

Is it safe to upload my EXCEL files for online XLSX conversion?

Your security and privacy are extremely important to us. Uploaded files are securely processed and automatically deleted from our servers shortly afterward, ensuring your data remains confidential.

Can I convert several EXCEL sheets into a single XLSX using C#?

Yes. you can. Conholdate.Total allows you to select and combine multiple sheets from your EXCEL workbook into a single XLSX document effortlessly.

Does Conholdate.Total for .NET support batch EXCEL files conversion to other formats?

Yes. Conholdate.Total for .NET supports batch conversion of EXCEL documents, allowing developers to convert multiple files at once.

Does the EXCEL to XLSX API work with .NET Core, .NET 5 and newer versions?

Absolutely. Our EXCEL-to-XLSX conversion API supports all modern .NET frameworks, including .NET Core, .NET 5, .NET 6, and even .NET 7. This gives you flexibility regardless of your project environment.

Can I add watermarks or passwords to XLSXs created from EXCEL files?

Yes. Conholdate.Total provides convenient features to enhance your XLSX documents. You can add watermarks for branding or confidentiality, apply password protection, and even customize other XLSX security settings easily during the conversion process.

What file formats for documents and images are supported by Conholdate.Total for .NET?

Conholdate.Total for .NET integrates APIs from Aspose and GroupDocs to enable .NET programmers to perform various document manipulation actions on a wide range of file formats including Word, Excel, PDF, PowerPoint, Visio, HTML and images in .NET, C#, ASP.NET and VB.NET applications.

Can I convert password-protected EXCEL files to XLSX in .NET?

Yes. Conholdate.Total for .NET supports the conversion of password-protected EXCEL files. With built-in methods to handle encrypted documents, you can securely convert sensitive files to XLSX while preserving their confidentiality and integrity.

What are the licensing costs for Conholdate.Total’s EXCEL to XLSX conversion API?

Conholdate.Total for .NET offers a fully functional free trial version for 30 days. Paid plans are available for higher usage levels. Developers should carefully review the pricing and licensing terms before using the document conversion API.

What is EXCEL file format?

Excel is an immensely popular spreadsheet software program developed by Microsoft Corporation. Its file format, a binary file format, stores data in worksheets comprising cells organized into rows and columns. Excel files typically possess either a .xlsx or .xls file extension. Within these files, one can find an array of data types including numbers, text, formulas, charts, and images. The file format also supports a plethora of formatting options, ranging from font styles, colors, and borders to conditional formatting that permits users to apply distinct formatting based on specific criteria.

The multifaceted nature of Excel files renders them invaluable for various tasks, including financial analysis, budgeting, and data analysis. When faced with large amounts of data, Excel provides an efficient means of organization and manipulation. Additionally, it serves as a versatile tool for creating visually appealing charts and graphs that facilitate data visualization.

Apart from the standard Excel file format, several other formats are commonly employed alongside it. For instance, CSV (Comma Separated Values) files enable the seamless import and export of data between diverse software applications. XML (Extensible Markup Language) files, on the other hand, allow structured data storage and exchange.

Excel’s enduring popularity stems from its user-friendly interface and extensive range of features. Its functionalities empower users to perform complex calculations, generate reports, and automate repetitive tasks. Whether you’re a professional in finance, data analysis, or simply an individual looking to effectively organize information, Excel remains an indispensable tool for achieving these objectives.

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What is XLSX file format?

The XLSX file format is a widely used file format for storing spreadsheet data. It was introduced by Microsoft as part of their Microsoft Office suite, specifically for the Excel application. XLSX stands for Excel Open XML Spreadsheet. Unlike its predecessor, the XLS format, which was based on a proprietary binary file structure, XLSX is based on the Open XML file format.

XLSX files are structured as a collection of XML files compressed into a single ZIP archive. This XML-based structure allows for more efficient storage and faster data processing. XLSX files store data in a tabular format, with rows and columns that can contain text, numbers, formulas, and other types of data. They also support formatting options such as cell styles, fonts, colors, and conditional formatting.

One of the advantages of the XLSX format is its compatibility across different platforms and software applications. Many spreadsheet programs, including Microsoft Excel, Google Sheets, and LibreOffice Calc, can open and edit XLSX files. This makes it easy to share and collaborate on spreadsheet data with others, regardless of the software they are using.

XLSX files also offer features like data validation, filtering, sorting, and the ability to create charts and graphs based on the data. Additionally, XLSX files can contain multiple sheets within a single file, allowing users to organize and manage different sets of data within a single document.

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