Digitally Sign XLSM Files in C# .NET, Xamarin & Mono

Add Digital Signatures to XLSM in C#

Conholdate.Total for .NET supports signing XLSM documents with digital signatures using a few lines of C# .NET code.

Instantiate Signature with input (XLSM) document
Instantiate DigitalSignOptions object with certificate details & password
Call Sign method of Signature class and pass DigitalSignOptions to it

Download Digital Signature API

Signing digital documents requires GroupDocs.Signature namespace. You can download the respective files or fetch the whole package directly from NuGet.

Sign your digtial documents with Barcode, Text, Image, Metadata, QR Code, Form Field and stamp signatures on operating systems such as Windows, Linux or macOS while using platforms such as Windows Azure, Mono and Xamarin.

Add Image Signatures to XLSM in C# .NET

Programmatically add digital image signatures to XLSM documents in C# .NET applications. Create custom images, company logos, names, stamps or icons with advanced affects using the electronic signature API.

Instantiate Signature with input (XLSM) document
Instantiate ImageSignOptions object as required and specify image signature options
Call Sign method of Signature class and pass ImageSignOptions to it

XLSM Document Information Extraction

The documents information extraction API not only allows getting the basic information about the source document file (XLSM) but it also supports extracting some valuable document information such as file type, file size, pages count, page height and width etc.

Add custom digital signatures to document formats on different operating systems such as Windows, Linux or macOS while using platforms such as Windows Azure, Mono and Xamarin.

Add Barcode Signatures to XLSM in C# .NET

Digitally sign XLSM documents with barcode or QR-code signatures in any type of .NET application. Add 60+ popular barcode types (machine-readable form) as electronic signatures to a wide range of digital documents and image formats.

Instantiate Signature with input (XLSM) document
Instantiate BarcodeSignOptions object as per requirementand specify barcode signature type
Specify barcode signature type and set Text property value
Call Sign method of Signature class and pass BarcodeSignOptions to it

Load & Sign Remotely Located Documents

The document eSign API enables you to render remotely located documents from various cloud document storage sources such as stream, local disk, URL, FTP, Amazon S3, and Azure Blob storage. The document preview feature enables you to get the image representation of the document pages that can be useful to preview and adjust the position of digital signature inside the document.

Get the document preview of whole document or some specific page numbers in PNG, JPG or BMP image formats.

What is XLSM file format?

The XLSM file format is an extension of the XLSX file format used for Microsoft Excel workbooks. Similar to XLSX, it is based on the Open XML file format and is associated with the Excel application. The “M” in XLSM stands for “macro-enabled”, indicating that it supports the inclusion of macros.

XLSM files store spreadsheet data, including worksheets, formulas, charts, and other elements commonly found in Excel workbooks. Additionally, XLSM files allow the embedding of VBA (Visual Basic for Applications) macros within the workbook. Macros are scripts written in VBA that automate tasks, perform calculations, and interact with the spreadsheet data.

By including macros in XLSM files, users can create customized functions, automate repetitive tasks, and enhance the functionality of their Excel workbooks. Macros can be written to manipulate data, generate reports, perform complex calculations, or interact with other applications.

When opening an XLSM file, Excel prompts the user to enable or disable macros due to security concerns. Enabling macros allows the embedded VBA code to execute, while disabling macros prevents potential security risks associated with malicious code.

XLSM files provide advanced features and customization options for Excel users who require automation beyond the capabilities of the standard XLSX format. They are commonly used in business environments, financial modeling, data analysis, and other scenarios where complex calculations and automation are necessary.

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Digitally Sign XLSM in C# .NET