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XLSX to XLSX using C#

The C# library for converting one Excel document to another Excel document format.

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XLSX to XLSX features

The C# library for converting XLSX file to XLSX file.

C# library install

ConvertAPI provides an ASP.NET C# library that allows you to perform a XLSX to XLSX conversion with just a few lines of code. Convert XLSX to XLSX documents using C# programming language with no effort at all!

NuGet Terminal >
Install-Package ConvertApi
NuGet GitHub

Authenticate ConvertAPI C# library

You can obtain your secret key by signing up for a free account. Once you sign up, you'll receive 250 free conversions instantly! Grab your authentication secret from the account dashboard, and authenticate the ConvertAPI C# library like this:

// get your secret key here: https://www.convertapi.com/a/auth
ConvertApi convertApi = new ConvertApi("secret_or_token");

XLSX to XLSX using C# in no time!

Once you have your authentication in place, simply copy-paste this xlsx to xlsx conversion code snippet into your C# project:

// Code snippet is using the ConvertAPI JavaScript Client: https://github.com/ConvertAPI/convertapi-js

// Code snippet is using the ConvertAPI Node.js Client: https://github.com/ConvertAPI/convertapi-nodejs

// Code snippet is using the ConvertAPI PHP Client: https://github.com/ConvertAPI/convertapi-php

// Code snippet is using the ConvertAPI Java Client: https://github.com/ConvertAPI/convertapi-java

// Code snippet is using the ConvertAPI C# Client: https://github.com/ConvertAPI/convertapi-dotnet

# Code snippet is using the ConvertAPI Ruby Client: https://github.com/ConvertAPI/convertapi-ruby

# Code snippet is using the ConvertAPI Python Client: https://github.com/ConvertAPI/convertapi-python

// Code snippet is using the ConvertAPI Go Client: https://github.com/ConvertAPI/convertapi-go

REM Code snippet is using the command line utility program: https://github.com/ConvertAPI/convertapi-cli

<!-- For conversions with the multiple file result please refer to this example: https://repl.it/@ConvertAPI/HTML-Form-with-multiple-file-result -->

Try the conversion online - no coding required!

You can try out advanced conversion parameters and test the conversion result online using our interactive demo tool. This tool will produce the same conversion output as if you were using the library from your solution, and it will auto-generate the code snippet for you!

Try for FREE!

Conversion parameters

Password String

Sets the password to open protected documents.

Try XLSX to XLSX for free!