title: What file size is data if it's 450KB base64 encoded?
body: <p>Is it possible to compute the size of data if I know its size when it's base64 encoded?</p>
  
  <p>I've a file that is 450KB in size when base64 encoded but what size is it decompressed?</p>
  
  <p>Is there a method to find output size without decompressing the file first?</p>