| A compiler converts an high level language program in machine language in one go. | An interpreter converts an high level language program into machine language line by line and simultaneously executes the converted line. |
| If there are errors in the program, it gives the error list along with the line numbers. | If an error occurs in a line, the line is displayed and interpreter does not proceed unless the error is rectified. |
| Once the errors are removed, error-free object code is made available and after this compiler is no more needed in the memory. | An interpreter must always be present in the memory along with the program for its execution. |