The advent of internet has made lives easier and businesses to prosper. Anyone in one part of the world can access the services in other end of the world, without any difficulties. The online audio mastering services are also now available online. Mastering is done to improve the quality of the music track and to make it more professional. It is the last stage in the creation of music that is aimed at improving the sound quality by making up for any deficiency that might have occurred in the prior stages. The sound is made sweeter through correction or enhancement. The music is tweaked wherever necessary to give it the professional touch that it needs to compete in the music market. Mastering is even more necessary when more than one track is involved. When there are two or more tracks in an album, the mastering engineer will add consistency throughout the album by fixing the gap between sings, leveling the volume, improving the loudness by reducing background noise etc. The mastering engineer has a range of equipments to test the audio quality of the track and make up for any drawbacks. The trained ears of the mastering engineer are able to identify any deficiencies in the audio track that might have remained unfulfilled in the earlier stages. Now the services of the mastering engineer are also available online. The customer may be residing in any other part of the world but he may be able to access the services of the mastering engineer anywhere in the world. The mastering services available online are at par with their offline counterparts.