OfficeIMO.Html.Pdf 2.0.1

OfficeIMO.Html.Pdf

OfficeIMO.Html.Pdf converts HTML directly to PDF with the same first-party layout scene used by HTML-to-PNG and HTML-to-SVG. It also converts PDF to semantic or positioned-review HTML.

The HTML-to-PDF path has no browser process, Office automation, Markdown bridge, Word bridge, or new external dependency.

Install

dotnet add package OfficeIMO.Html.Pdf

HTML to PDF

using OfficeIMO.Html;
using OfficeIMO.Html.Pdf;

string html = """
<h1>Quarterly update</h1>
<p>Generated directly by OfficeIMO.</p>
<table>
  <tr><th>Area</th><th>Status</th></tr>
  <tr><td>PDF</td><td>Green</td></tr>
</table>
""";

HtmlConversionDocument source = HtmlConversionDocument.Parse(html);
byte[] pdf = source.ToPdf();
source.SaveAsPdf("quarterly-update.pdf");

Naming is consistent across the direct output APIs:

• ToPdf() returns encoded bytes.
• ToPdfDocument() returns the first-party PDF model.
• ToPdfDocumentResult() returns the PDF model plus diagnostics.
• ExportImage() and ExportImages() return image output, dimensions, and diagnostics.
• SaveAsPdf(path) and SaveAsPdf(stream) write to a destination.
• Async counterparts use the same names with Async appended.

One options shape for PDF, PNG, and SVG

HtmlPdfSaveOptions derives from HtmlRenderOptions, so one configured instance can drive all three direct outputs.

using OfficeIMO.Drawing;
using OfficeIMO.Html;
using OfficeIMO.Html.Pdf;

var options = new HtmlPdfSaveOptions {
    PageSize = OfficePageSizes.A4,
    Margins = HtmlRenderMargins.All(32),
    DefaultFontFamily = "Arial",
    BackgroundColor = OfficeColor.White,
    Scale = 1.5
};

HtmlConversionDocument source = HtmlConversionDocument.Parse(html);
byte[] pdf = source.ToPdf(options);
byte[] png = source.ToPng(options);
string svg = source.ToSvg(options);

PDF always uses paged layout. PNG and SVG honor the selected render mode and page index.

Diagnostics and external resources

Options are reusable configuration and are not mutated with operation results. Request a result when diagnostics matter.

var options = new HtmlPdfSaveOptions {
    ResourceResolver = (request, cancellationToken) =>
        Task.FromResult<HtmlResolvedResource?>(null)
};

HtmlConversionDocument source = HtmlConversionDocument.Parse(html);
var result = await source.ToPdfDocumentResultAsync(options);
var pngResult = await source.ExportImageAsync(OfficeImageExportFormat.Png, options);
var svgResult = await source.ExportImageAsync(OfficeImageExportFormat.Svg, options);
await result.SaveAsync("report.pdf");

foreach (var warning in result.Report.Warnings) {
    Console.WriteLine($"{warning.Code}: {warning.Message}");
}

foreach (var diagnostic in pngResult.Diagnostics) {
    Console.WriteLine($"{diagnostic.Code}: {diagnostic.Message}");
}

foreach (var diagnostic in svgResult.Diagnostics) {
    Console.WriteLine($"{diagnostic.Code}: {diagnostic.Message}");
}

Resource resolution is opt-in and controlled by HtmlUrlPolicy, timeouts, byte limits, count limits, and stylesheet-depth limits inherited from HtmlRenderOptions.

Explicit document projections

Direct rendering is the normal HTML-to-PDF path. If the desired target is an editable Word document or a Markdown AST, request that target explicitly and then use its PDF converter:

using OfficeIMO.Markdown.Html;
using OfficeIMO.Markdown.Pdf;
using OfficeIMO.Word.Html;
using OfficeIMO.Word.Pdf;

HtmlConversionDocument source = HtmlConversionDocument.Parse(html);
byte[] markdownPdf = source.ToMarkdownDocument().ToPdf();

using var word = source.ToWordDocument();
byte[] wordPdf = word.ToPdf();

Those adapters remain separate packages and are not dependencies of OfficeIMO.Html.Pdf.

PDF to HTML

using OfficeIMO.Html.Pdf;

string semantic = PdfHtmlConverterExtensions.ToHtml("quarterly-update.pdf", new PdfHtmlSaveOptions {
    Profile = PdfHtmlProfile.Semantic
});

PdfHtmlConverterExtensions.SaveAsHtml("quarterly-update.pdf", "quarterly-review.html", new PdfHtmlSaveOptions {
    Profile = PdfHtmlProfile.PositionedReview,
    IncludeLinkAnnotations = true,
    IncludeFormWidgets = true,
    ImageExportMode = PdfHtmlImageExportMode.EmbeddedDataUri
});

PDF-to-HTML profiles describe how an existing PDF is projected to HTML. They are unrelated to HTML-to-PDF, which has one direct rendering path.

Targets and license

• Targets: netstandard2.0, net8.0, net10.0.
• License: MIT.
• Repository: EvotecIT/OfficeIMO

Dependency footprint

• External: None beyond AngleSharp/AngleSharp.Css already isolated in OfficeIMO.Html; no browser process or native HTML renderer.
• OfficeIMO: OfficeIMO.Html, OfficeIMO.Pdf, and OfficeIMO.Drawing own layout, rendering, reverse projection, and reports.

See the complete OfficeIMO package map for related formats and conversion paths.