XLSX to PDF C#

Convert MS Office Excel files to PDF in .NET C#

Converting XLS and XLSX to PDF in C# is a common need for developers who want to generate printable, shareable reports from Excel spreadsheets while preserving layout, formulas, and formatting.

With ConvertAPI, you can convert XLSX files to high-quality PDFs in seconds using a simple, reliable C# integration. Whether you are automating financial reports, invoices, or any spreadsheet-based workflow, our SDK handles the heavy lifting while giving you control over page size, orientation, and security.

Key Benefits:

• No need for MS Office installation and licensing.
• Preserves tables, formulas, and formatting during conversion.
• ConvertAPI .NET C# SDK library makes setup quick with minimal code.
• Set advanced parameters like page ranges, add passwords, generate PDF/A, and compress outputs for reduced file sizes.

XLSX to PDF with Custom Parameters

Once you have installed the NuGet package, and authenticated the ConvertAPI library, you can set up the XLSX to PDF conversion parameters on the live-demo page. You will receive an auto-generated code snippet that looks something like this:

var convert = await convertApi.ConvertAsync("xlsx", "pdf",
    new ConvertApiFileParam("File", @"C:\path\to\my_file.xlsx"),
    new ConvertApiParam("WorksheetActive", "true"),
    new ConvertApiParam("PageOrientation", "landscape"),
    new ConvertApiParam("PageSize", "a2"),
    new ConvertApiParam("AutoFit", "true"),
    new ConvertApiParam("Scale", "0.7"),
    new ConvertApiParam("ThousandsSeparator", "."),
    new ConvertApiParam("DecimalSeparator", ","),
    new ConvertApiParam("DateFormat", "iso")
);
await convert.SaveFilesAsync(@"C:\converted-files\");

In this example, we are converting an XLSX file to PDF while fitting as much content as possible on a single page for clear, compact reporting.

We set the PageOrientation to landscape to fit more columns horizontally, and PageSize to a2 to provide a larger printable area. Additionally, we apply Scale set to 0.7 to slightly shrink rows and columns, making it easier to fit wide datasets on one page without losing readability.

Other parameters like AutoFit, custom thousands and decimal separators, and ISO date formatting ensure that your PDF output remains clean, well-structured, and ready for sharing or printing, even when handling large tables.

Feel free to try the conversion for free on the XLSX to PDF live demo page. You can fine-tune the conversion parameters to match your intended result with no coding at all. Happy converting!