[HttpGet("download-pdf")] public IActionResult DownloadPdf() { string base64Pdf = "JVBERi0xLjcKJcKzx9gNCjEgMCBvYmoNPDwvTmFtZXMgPDwv..."; // Your Base64 string try { byte[] pdfBytes = Convert.FromBase64String(base64Pdf); // Return the file with the correct MIME type and a suggested filename return File(pdfBytes, "application/pdf", "DownloadedDocument.pdf"); } catch (FormatException) { return BadRequest("Invalid Base64 string format."); } } Use code with caution. 3. Key Implementation Details c# - convert base64Binary to pdf - Stack Overflow
Converting a Base64 string into a downloadable PDF in C# is a common task when handling file transfers via JSON APIs or storing documents in databases. The process generally involves decoding the string into a byte array and then either saving it to a local disk or streaming it back to a web browser. 1. Basic Conversion (Console or Desktop) how to download base64 pdf in c#
If you are working on a standalone application, you can decode the Base64 string and save it directly to a file using the System.IO and System namespaces. The process generally involves decoding the string into
26 Oct 2009 — * 6 Answers. Sorted by: 52. Step 1 is converting from your base64 string to a byte array: byte[] bytes = Convert.FromBase64String( Stack Overflow Base64 Encode a PDF in C#? - Stack Overflow 26 Oct 2009 — * 6 Answers
using System; using System.IO; public class PdfDownloader { public static void SaveBase64AsPdf(string base64String, string outputPath) { // 1. Remove the Data URI prefix if it exists (e.g., "data:application/pdf;base64,") if (base64String.Contains(",")) { base64String = base64String.Split(',')[1]; } // 2. Convert Base64 string to a byte array byte[] pdfBytes = Convert.FromBase64String(base64String); // 3. Write bytes to a local file File.WriteAllBytes(outputPath, pdfBytes); Console.WriteLine($"PDF saved successfully to {outputPath}"); } } Use code with caution. 2. Downloading in ASP.NET Core (Web API/MVC)
In web applications, you typically want the user's browser to trigger a download window. You can achieve this by returning a FileResult from your controller.