From there you need to download the file.

Once the conversion to midi is completed you will be redirected to the download page. This converter will convert the uploaded audio file to midi. You can also enter its URL to get started. After selecting the audio file, just hit the Start Conversion button. Just open this converter and click the Choose File button to select the local file from your PC or smartphone. Conversion Tool is a free online mp3 to midi converter site that doesn’t require you to install any software on your Windows/Mac machine. While most of the audio to midi converter would require software installations to be made in your PC, this one wouldn’t. Upon hitting the enter button the file will be converted and the audio to midi online converter will give you the generated midi file to download. You can also enter the URL of the file to convert. You are ready to go, this tool will instantly convert the audio file to midi format. Just click on it and choose the audio file that you want to convert into midi. Once you open the Bear File Converter, you will find an Upload button.

Good mp3 to midi converter