Chế độ mã hóa số và chữ-số
Numeric mode encodes digits at 3.33 bits/char (most efficient), while alphanumeric mode encodes uppercase + digits + 9 symbols at 5.5 bits/char. URLs in uppercase can use alphanumeric mode for 33% smaller codes.
Numeric mode encodes digits at 3.33 bits/char (most efficient), while alphanumeric mode encodes uppercase + digits + 9 symbols at 5.5 bits/char. URLs in uppercase can use alphanumeric mode for 33% smaller codes.