Convert HTML to GIF – C# Examples and Online Converter

Using Converter.ConvertHTML methods is the most common way to convert HTML code into various formats. With Aspose.HTML, you can convert HTML to GIF format programmatically with full control over a wide range of conversion parameters.

GIF is a popular image format that supports animated images and frequently used in web publishing. HTML to GIF conversion allows you to save an HTML document as a GIF image. In this article, you find information on how to convert HTML to GIF using ConvertHTML() methods of the Converter class, and how to apply ImageSaveOptions and ICreateStreamProvider parameters.

Online HTML Converter

You can check the Aspose.HTML API functionality and convert HTML in real-time. Please load HTML from the local file system, select the output format and run the example. In the example, the save options are set by default. You will immediately receive the result as a separate file.

                
            

If you want to convert HTML to GIF programmatically, please see the following C# code examples.

Convert HTML to GIF

Converting a file to another format using the ConvertHTML() method is a sequence of operations among which document loading and saving:

  1. Load an HTML file using the HTMLDocument class ( spring.html).
  2. Create a new ImageSaveOptions object with GIF ImageFormat. By default, the Format property is PNG.
  3. Use the ConvertHTML() method of the Converter class to save HTML as a GIF image. You need to pass the HTMLDocument, ImageSaveOptions, and output file path to the ConvertHTML() method for HTML to GIF conversion.

Please take a look over the following C# code snippet which shows the process of converting HTML to GIF using Aspose.HTML for .NET.

 1using System.IO;
 2using Aspose.Html;
 3using Aspose.Html.Converters;
 4using Aspose.Html.Rendering.Image;
 5using Aspose.Html.Saving;
 6...
 7    // Prepare a path to a source HTML file
 8    string documentPath = Path.Combine(DataDir, "spring.html");
 9
10    // Prepare a path for converted file saving 
11    string savePath = Path.Combine(OutputDir, "spring-output.gif");
12
13    // Initialize an HTML document from the file
14    using var document = new HTMLDocument(documentPath);
15
16    // Initialize ImageSaveOptions 
17    var options = new ImageSaveOptions(ImageFormat.Gif);
18
19    // Convert HTML to GIF
20    Converter.ConvertHTML(document, options, savePath);

You can download the complete examples and data files from GitHub.

Save Options

Aspose.HTML allows converting HTML to GIF using default or custom save options. ImageSaveOptions usage enables you to customize the rendering process; you can specify the image format, page size, margins, compression level, CSS media-type, etc.

PropertyDescription
CompressionSets Tagged Image File Format (TIFF) Compression. By default, this property is LZW.
CSSGets a CssOptions object which is used for configuration of CSS properties processing.
FormatSets the ImageFormat (JPG, PNG, BMP, TIFF, or GIF). By default, this property is PNG.
BackgroundColorThis property sets the color that will fill the background. By default, this property is Transparent.
PageSetupThis property gets a page setup object and uses it for configuration output page-set.
HorizontalResolutionSets horizontal resolution for output images in pixels per inch. The default value is 300 dpi.
VerticalResolutionSets vertical resolution for output images in pixels per inch. The default value is 300 dpi.
SmoothingModeThis property sets the rendering quality for this image. Available values are Invalid, Default, HighSpeed, HighQuality, None, and AntiAlias.
TextGets a TextOptions object which is used for configuration of text rendering.

To learn more about the ImageSaveOptions class, please read the Fine-Tuning Converters article.

Convert HTML to GIF using ImageSaveOptions

To convert HTML to GIF with ImageSaveOptions specifying, you should follow a few steps:

  1. Load an HTML file using one of the HTMLDocument() constructors of the HTMLDocument class.
  2. Create a new ImageSaveOptions object with GIF ImageFormat and specify save options. By default, the Format property is PNG.
  3. Use the ConvertHTML() method of the Converter class to save HTML as a GIF image. You need to pass the HTMLDocument, ImageSaveOptions, and output file path to the ConvertHTML() method to convert HTML to GIF.

The following C# code snippet shows how to convert HTML to GIF using custom save options:

 1using System.IO;
 2using Aspose.Html;
 3using Aspose.Html.Converters;
 4using Aspose.Html.Rendering.Image;
 5using Aspose.Html.Saving;
 6using System.Drawing;
 7using System.Drawing.Drawing2D;
 8...
 9    string documentPath = Path.Combine(OutputDir, "convert-to-gif.html");
10    string savePath = Path.Combine(OutputDir, "convert-to-gif-options.gif");
11
12    // Prepare HTML code and save it to a file
13    var code = "<h1> HTML to GIF Converter </h1>\r\n" +
14               "<p> HTML to GIF conversion allows you to save an HTML document as a GIF image.</p>\r\n";
15
16    File.WriteAllText(documentPath, code);
17
18    // Initialize an  HTML Document from the html file
19    using var document = new HTMLDocument(documentPath);
20
21    // Initialize ImageSaveOptions 
22    var options = new ImageSaveOptions(ImageFormat.Gif)
23    {
24        SmoothingMode = SmoothingMode.Default,
25        HorizontalResolution = 100,
26        VerticalResolution = 100,
27        BackgroundColor = System.Drawing.Color.MistyRose
28    };
29     options.PageSetup.AnyPage = new Page(new Aspose.Html.Drawing.Size(500, 200), new Margin(30, 20, 10, 10));
30
31    // Convert HTML to GIF
32    Converter.ConvertHTML(document, options, savePath);   

The ImageSaveOptions() constructor initializes an instance of the ImageSaveOptions class that is passed to ConvertHTML() method. The ConvertHTML() method takes the document, options, output file path savePath and performs the conversion operation.

In the above example, we apply:

The figure illustrates the convert-to-gif-options.gif file.

Text “convert-to-gif-options.gif image”

You can download the complete examples and data files from GitHub.

Aspose.HTML offers a free online HTML to GIF Converter that converts HTML to GIF image with high quality, easy and fast. Just upload, convert your files and get results in a few seconds!

Text “Banner HTML to GIF Converter”

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