string filePath = @"C:\Downloads\myimage.png"; File.WriteAllBytes(filePath, fileBytes); Use code with caution. Step 3: Downloading via ASP.NET Core Web API

string rawInput = "data:application/pdf;base64,JVBERi0xLjQKJ..." string base64Payload = rawInput.Split(',')[1]; byte[] cleanBytes = Convert.FromBase64String(base64Payload); Use code with caution. Best Practices and Performance When dealing with large files, keep these tips in mind:

Validation: Check the length of the string before processing to prevent denial-of-service (DoS) attacks via oversized payloads.

For console apps or background services, use File.WriteAllBytes . This is the most efficient way to dump a byte array directly to the disk.

Download Base64 String As File C# |link| -

string filePath = @"C:\Downloads\myimage.png"; File.WriteAllBytes(filePath, fileBytes); Use code with caution. Step 3: Downloading via ASP.NET Core Web API

Validation: Check the length of the string before processing to prevent denial-of-service (DoS) attacks via oversized payloads. string filePath = @"C:\Downloads\myimage

For console apps or background services, use File.WriteAllBytes . This is the most efficient way to dump a byte array directly to the disk. string filePath = @"C:\Downloads\myimage.png"