Digitally Sign XLSX File Online via e-Signature App or using .NET

Develop powerful .NET based XLSX document signing applications. Freely add digital signature into various documents including XLSX files online via app with instant download.

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Add Digital Signature into XLSX Files Online using App

Upload XLSX files to sign digitally
Add text for signature or upload signature image
Click the “Sign” button
Download the signed XLSX file

Digitally Sign XLSX File via .NET

Load XLSX file using Workbook class object
Create DigitalSignatureCollection object
Load pfx certificate
Use DigitalSignature method to load the certificate
Use Add method for adding signature into signature collection
Invoke AddDigitalSignature with collection as parameter
Finally save it

.NET Code : Add Digital Signature in XLSX Files

Develop E-Signature Application using .NET

Need to develop .NET script or utility app to easily sign multiple XLSX files digitally? With Aspose.Cells for .NET , child API of Aspose.Total for .NET , any .NET developer can integrate the above API code to program eSignature app for signing across spreadsheets. Powerful .NET library for spreadsheet signing, supports many popular formats including XLSX format.

XLSX eSignature library for .NET

There are three alternative options to install “Aspose.Cells for .NET” or “Aspose.Total for .NET” onto your system. Please choose one that resembles your needs and follow the step-by-step instructions:

Install a NuGet Package . See Documentation
Install the library using Package Manager Console within Visual Studio IDE
Install the library by hand using Windows Installer

System Requirements

Our product is fully cross-platform and supports all major .NET implementations following ‘.NET Standard 2.0’ specification:

Microsoft .NET Framework, starting from the earliest 2.0 version, and ending with the latest ‘.NET Framework 4.8’
.NET Core, starting from the earliest 2.0, and ending with the latest ‘.NET 6’
Mono >= 2.6.7

As .NET code doesn’t rely on the underlying hardware or operating system, but only on a Virtual Machine, so you are free to develop any kind of software for Windows, macOS, Android, iOS and Linux. Just make sure you have installed the corresponding version of .NET Framework, .NET Core, Windows Azure, Mono or Xamarin.

We recommend using Microsoft Visual Studio, Xamarin, and MonoDevelop IDE to create C#, F#, VB.NET applications.

For more details please refer to Product Documentation .

FAQs

Can I use above .NET code in my application?
Yes, you are welcome to download this code. One can easily develop a professional solution to add digital signature in XLSX file using .NET. Use Aspose XLSX eSignature API to develop high-level, platform independent software in .NET.
Is this document digital signing App work only on Windows?
You have the flexibility to initiate document signing from any device, irrespective of the operating system it runs on, whether it be Windows, Linux, Mac OS, or Android. All that's required is a contemporary web browser and an active internet connection.
Is it safe to use the online app to sign multiple XLSX documents?
Of course! The output files generated through our service will be securely and automatically removed from our servers within a 24-hour timeframe. As a result, the download links associated with these files will cease to be functional after this period.
What browser should to use App?
You can use any modern web browser like Google Chrome, Firefox, Opera, or Safari for online XLSX document compression.
How can I sign multiple XLSX files?
Start by uploading one or more files you want to sign. You can either drag and drop your XLSX files or simply click inside the white area. Afterward, click the 'Sign' button, and our online esigning app will quickly process the uploaded files.
How long does it take to sign the XLSX files?
This e-signature application operates quickly, It may take a few seconds to upload the files and sign them.