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Home Forums How can you get the size of a file in bytes? – MindStick
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1 Answers

Utpal Vishwas
Utpal Vishwas 21 May 2025
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To get the size of a file in bytes in C#, you can use the FileInfo class from the System.IO namespace.

Example: Get File Size in Bytes

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = @"C:\example\myfile.txt";

        if (File.Exists(filePath))
        {
            FileInfo fileInfo = new FileInfo(filePath);
            long sizeInBytes = fileInfo.Length;

            Console.WriteLine($"File size: {sizeInBytes} bytes");
        }
        else
        {
            Console.WriteLine("File does not exist.");
        }
    }
}

Notes:

  1. FileInfo.Length returns the size in bytes as a long.
  2. Always check if the file exists to avoid exceptions.

Convert to KB/MB (Optional):

double sizeInKB = sizeInBytes / 1024.0;
double sizeInMB = sizeInBytes / (1024.0 * 1024.0);
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