Convert text to PDF in ASP.NET

Nutrient Web SDK is a client-side JavaScript library that’s fully compatible with ASP.NET for converting text documents to PDF directly in the browser, without the need for server-side processing. To convert text files to PDF, Nutrient Web SDK relies entirely on its own technology built from the ground up, and it doesn’t depend on third-party tools. For more information on the supported formats, see the list of supported file types.

Converting text documents to PDFs after displaying

To convert a text document to a PDF after displaying it in the Nutrient viewer, follow the steps below.

1. Load the source text document (optional). To load the document without a user interface visible to the user, use the headless parameter.
2. Make changes to the document (optional). For example, add annotations.
3. Convert the source document to a PDF with the exportPDF method (optional). Use the outputFormat flag to create a PDF/A document. For more information, see converting PDF to PDF/A.
4. Save the output document. The exportPDF method returns a Promise that resolves to an ArrayBuffer containing the output PDF document. You can use the resulting ArrayBuffer to download or persist the output PDF in storage. For more information on downloading or persisting the exported ArrayBuffer, see the guides on saving a document.

The following example loads a text document and exports it to a PDF:

NutrientViewer.load({
  container: "#pspdfkit",
  document: "source.txt",
  licenseKey: "YOUR_LICENSE_KEY"
}).then((instance) => {
  instance.exportPDF();
});

The following example loads a text document, exports it to a PDF with conformance level PDF/A-4f, and downloads it in the client’s browser:

NutrientViewer.load({
  container: "#pspdfkit",
  document: "source.txt",
  licenseKey: "YOUR_LICENSE_KEY"
})
  .then((instance) =>
    instance.exportPDF({
      outputFormat: {
        conformance: NutrientViewer.Conformance.PDFA_4F
      }
    })
  )
  .then(function (buffer) {
    const blob = new Blob([buffer], { type: "application/pdf" });
    const objectUrl = window.URL.createObjectURL(blob);
    downloadPdf(objectUrl);
    window.URL.revokeObjectURL(objectUrl);
  });
function downloadPdf(blob) {
  const a = document.createElement("a");
  a.href = blob;
  a.style.display = "none";
  a.download = "output.pdf";
  a.setAttribute("download", "output.pdf");
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
}

When exporting a document, you have several options. Refer to our guides on flattening annotations and incremental saving for more details.

Auto saving can be configured for different scenarios and use cases. You can find more information in our auto save guide.

Converting text documents to PDFs without displaying

To convert a text document to a PDF without displaying it in the Nutrient viewer, follow the steps below.

1. Load and convert the source text document using the convertToPDF method. This method takes the following parameters:
   • A Configuration object that specifies the path to the source document and the license key.
   • A member of the Conformance enumeration that specifies the conformance level of the output PDF document (optional). If you provide this parameter, the output is a PDF/A document.
2. Save the output document. The convertToPDF method returns a Promise that resolves to an ArrayBuffer containing the output PDF document. You can use the resulting ArrayBuffer to download or persist the output PDF in storage. For more information on downloading or persisting the exported ArrayBuffer, see the guides on saving a document.

The following example exports the loaded document to a PDF with conformance level PDF/A-4f:

NutrientViewer.convertToPDF(
  {
    document: "source.txt",
    licenseKey: "YOUR_LICENSE_KEY"
  },
  NutrientViewer.Conformance.PDFA_4F
);

The following example converts a text document to a PDF document and downloads it in the client’s browser:

NutrientViewer.convertToPDF({
  document: "source.txt",
  licenseKey: "YOUR_LICENSE_KEY"
}).then(function (buffer) {
  const blob = new Blob([buffer], { type: "application/pdf" });
  const objectUrl = window.URL.createObjectURL(blob);
  downloadPdf(objectUrl);
  window.URL.revokeObjectURL(objectUrl);
});
function downloadPdf(blob) {
  const a = document.createElement("a");
  a.href = blob;
  a.style.display = "none";
  a.download = "output.pdf";
  a.setAttribute("download", "output.pdf");
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
}

When exporting a document, you have several options. Refer to our guides on flattening annotations and incremental saving for more details.

Auto saving can be configured for different scenarios and use cases. You can find more information in our auto save guide.