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.

Latest Articles

How to Convert Excel to HTML in C# How to Convert HTML to Excel in C#

Aspose.Cells HTML Converter Key Features

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.
Import HTML Content into Excel
Load HTML strings or files and convert them into Excel workbooks with support for tables, formatting, and structure.
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.
Stream-Based Input and Output
Save or load HTML via memory streams—ideal for web apps, APIs, or serverless environments.
Broad Format Support
Works with a wide range of formats: XLS, XLSX, XLSB, XLSM, XLTX, XLTM, HTML, and MHTML—allowing conversion between HTML and both legacy and modern Excel files.
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

Error	Solution
`File not found`	Ensure the input path is correct and file exists
`Unsupported format`	Confirm the file is either an HTML or Excel-compatible format
Missing styles in output HTML	Check HtmlSaveOptions and confirm formatting is retained
Content not aligned in imported Excel	Use tables in HTML and avoid deeply nested DIVs