This app is Standard MIDI File Player like MP3 music player. You can play Standard MIDI File with your browser. Even if you do not own any external MIDI Device, this app support Web MIDI which is tone generator build on top of Web Audio API.

You can open MIDI files from your Google Drive™ and from your computer.
Supports mid files, MIDI-like (kar, hmi, hmp, mmp, mmpz, abc), Doom Music (mus), xmi (Simple MIDI Player), MuseScore (mscz, mscx), Module Music (mod, xm, s3m, it, vgm/vgz/nsf game music), MusicXML (musicxml, xml, mxl), and AdLib Sound (ksm, rol, sng..) formats.
You don't need to install any further software or plugin to play MIDI files.

This app provides 2-Type MIDI Player.
Simple MIDI Player (Fast Loading, Basic Instrument) and Full MIDI Player (Full Instrument)

Supported formats:
mid,midi,kar,hmi,hmp,mus,xmi,mod,xm,s3m,it,vgm,vgz,nsf,mmp,mmpz,mscz,mscx,abc,xml,musicxml,mxl

AdLib sound formats:
a2m,adl,agd,amd,bam,bmf,cff,cmf,d00,dfm,dmo,dro,dtm,got,ha2,hsc
hsp,hsq,imf,ims,jbm,ksm,laa,lds,m,mad,mdi,mkj,msc,mtk,rad,raw,rix,rol
sa2,sat,sci,sdb,sng,sop,sqx,xad,xms,xsm,as3m,cmf2,dro2,mkf,pis
sng2,sng3,u6m,wlf,xad2,xad3,xad4,xad5

Supports Chrome, Firefox, Safari, Edge...