HTML Converter

The Aspose.Cells HTML Converter for .NET Plugin enables developers to export Excel files to HTML and load HTML files or markup directly into Excel workbooks. Whether you’re building browser-based viewers, email-based reports, or integrations with CMS systems, this plugin helps bridge Excel and HTML effortlessly.

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Aspose.Cells HTML Converter Key Features

  1. Export Excel to HTML
    Convert Excel files to HTML for web display or lightweight sharing. Export entire workbooks or specific worksheets as clean, responsive HTML using the Excel to HTML Converter.

  2. Import HTML Content into Excel
    Load HTML strings or files and convert them into Excel workbooks with support for tables, formatting, and structure. This functionality allows you to convert HTML in Excel seamlessly.

  3. Flexible HTML Rendering Options
    Control the output with HtmlSaveOptions, including how hidden rows/columns are handled, whether to export worksheets individually or together, and more.

  4. Stream-Based Input and Output
    Save or load HTML via memory streams—ideal for web apps, APIs, or serverless environments. This includes the ability to Aspose Cells Save to Stream for efficient data handling when you need to convert spreadsheet to HTML.

  5. Broad Format Support
    Works with a wide range of formats: XLS, XLSX, XLSB, XLSM, XLTX, XLTM, HTML, and MHTML—allowing you to convert XLS to HTML, and both legacy and modern Excel files.

  6. Native .NET Integration
    Easily integrates with .NET Framework and .NET Core/6/7/8 projects using NuGet or direct assembly reference.

Getting Started with Aspose.Cells HTML Converter for .NET

1. Install Aspose.Cells for .NET

Use NuGet to add Aspose.Cells to your project:

dotnet add package Aspose.Cells

Excel to HTML Conversion

Export your Excel workbooks to clean HTML format:

Convert Excel File to HTML File 

Workbook workbook = new Workbook("Book1.xlsx");
HtmlSaveOptions options = new HtmlSaveOptions(SaveFormat.Html);
workbook.Save("output.html", options);

Export Excel File to HTML Stream (e.g., for web app) 

Workbook workbook = new Workbook("Book1.xlsx");

using (MemoryStream stream = new MemoryStream())
{
    workbook.Save(stream, SaveFormat.Html);
    stream.Position = 0;
    // Use the stream for web response, writing to file, etc.
}

HTML to Excel Conversion

Convert HTML files or raw markup back into an Excel workbook:

Load HTML Content from a File 

HtmlLoadOptions loadOptions = new HtmlLoadOptions();
Workbook workbook = new Workbook("input.html", loadOptions);
workbook.Save("html_to_excel.xlsx");

Load HTML Content from a String 

string html = "<html><body><table><tr><td>Product</td><td>Price</td></tr><tr><td>Pen</td><td>$1.99</td></tr></table></body></html>";
using (MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(html)))
{
    Workbook workbook = new Workbook(stream, new HtmlLoadOptions());
    workbook.Save("html_string_to_excel.xlsx", SaveFormat.Xlsx);
}

Most Popular Scenarios

Convert Excel Worksheet to HTML for Web Use 

Workbook workbook = new Workbook("report.xlsx");
HtmlSaveOptions options = new HtmlSaveOptions
{
    ExportHiddenWorksheet = false,
    ExportGridLines = true
};
workbook.Save("report.html", options);

Import Styled HTML Table into Excel 

Workbook workbook = new Workbook("styled_table.html", new HtmlLoadOptions());
workbook.Save("styled_table.xlsx");

Best Practices for HTML Conversion

  • Use HtmlSaveOptions.ExportGridLines = true to mimic the spreadsheet layout.
  • Preprocess Excel data to fit within browser-friendly dimensions.
  • When importing, ensure the HTML is well-formed and uses table elements for optimal results.
  • Save to a stream if you intend to serve HTML directly in web APIs or cloud functions.

Common Issues and Resolutions

ErrorSolution
File not foundEnsure the input path is correct and file exists
Unsupported formatConfirm the file is either an HTML or Excel-compatible format
Missing styles in output HTMLCheck HtmlSaveOptions and confirm formatting is retained
Content not aligned in imported ExcelUse tables in HTML and avoid deeply nested DIVs

With these capabilities, Aspose.Cells provides a powerful tool for converting Excel to HTML while ensuring that formatting is preserved, allowing for seamless integration and display across various platforms. You can also convert Excel to HTML with formatting to enhance user experience and visual appeal. Additionally, our Excel to Web App Converter simplifies the process of sharing your spreadsheets online. If you’re looking to convert HTML to Excel, our tools will ensure a smooth transition. For further assistance with the HTML to Excel conversion, please refer to our comprehensive guides on how to convert XLS to HTML efficiently. Furthermore, if you need to convert HTML file to Excel C# or utilize an Excel HTML Converter, our solutions are designed to meet those needs effectively.

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