Convert XLS to XLTX in C# .NET or Online XLS Converter

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

Convert your XLS files to other popular documents formats such as PDF, HTML, PowerPoint presentations and Word processing documents using C# .NET code. Load the source XLS 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 XLS 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 XLTX 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 XLS to XLTX with Watermarks

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

Create Converter object to convert XLS 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 XLTX

Extract XLS Document Information

Discover valuable file-format specific information using the document information extraction feature. Obtain basic details from the source document file (XLS) 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 XLS in .NET

Converting a JSON file to XLS 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 (XLS) 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 XLS Conversion Simplified

With Conholdate.Total for .NET, developers can follow a simple method to load and convert XLS 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 XLS files to XLTX online without paying anything?

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

How do I convert XLS files to XLTX using C# code?

Converting XLS files to XLTX 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 XLS installed to perform XLS-to-XLTX conversions with C#?

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

How quickly does your online XLS-to-XLTX 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 XLS files.

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

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

Can I automate the XLS-to-XLTX conversion on my own servers?

Definitely! You can automate the XLS-to-XLTX 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 XLS files for online XLTX 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 XLS sheets into a single XLTX using C#?

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

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

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

Does the XLS to XLTX API work with .NET Core, .NET 5 and newer versions?

Absolutely. Our XLS-to-XLTX 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 XLTXs created from XLS files?

Yes. Conholdate.Total provides convenient features to enhance your XLTX documents. You can add watermarks for branding or confidentiality, apply password protection, and even customize other XLTX 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 XLS files to XLTX in .NET?

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

What are the licensing costs for Conholdate.Total’s XLS to XLTX 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 XLS file format?

The XLS file format is a file format used by Microsoft Excel, an application for spreadsheet and graphing. It is an updated version of the XLS file format that was introduced in Excel 97. The XLS file format is a spreadsheet format and can be used to store data in cells arranged in a tabular format. It can be used to create charts and graphs, along with other features such as formulas, variables and macros.

XLS files can be protected with passwords and encryption, allowing users to protect sensitive data. They also support multiple sheets, so they can contain large amounts of data. XLS files can be opened and read by a wide variety of software, including Microsoft Excel and other spreadsheet applications.

XLS files are compatible with a variety of operating systems and devices, making them a popular choice for storing, sharing and transferring data. They are usually used for data analysis, report-building, simulations and other business operations.

XLS files are also used for statistical analysis. They are used to visually display data in the form of charts, graphs and tables. They can also be used to store and analyze large amounts of data.

Overall, the XLS file format is an important file format used for storing and sharing data. It is used for data storage, analysis and report-building. It is compatible with a variety of different operating systems and devices, making it a popular choice for businesses.

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What is XLTX file format?

The Xltx file format is a Microsoft Excel spreadsheet file format which is used to store and exchange data. It is a binary file format that is written in the Microsoft Office Open XML format and is a part of the Office Open XML (OOXML). It is a file format that is a part of the ISO/IEC standard 29500. Xltx is essentially an Excel workbook that is saved in the Open XML format for maximum compatibility and stability. This format makes it easier for users to open, view and share their spreadsheets with others. The Xltx format provides the same functionality and features found in the standard .xlsx format, but with some advantages. The advantages of using the Xltx format include improved security, faster load times, smaller file sizes, and improved compatibility with other programs. Xltx files are also more reliable when transferring data between different versions of Excel. Additionally, Xltx files are less vulnerable to viruses and corruptions. Overall, the Xltx file format is a great choice for users who need to store and exchange data in Excel spreadsheets. It offers all of the same features found in the standard .xlsx format, with some added security and compatibility benefits.

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