UTAU wiki
UTAU wiki

UTAU (Vocal Synthesizer Tool UTAU formally) is a program which was developed to use wave files to simulate singing. UTAU is best known for letting regular people create their own voicebanks.


UTAU has its origin in "Jinriki Vocaloid" (人力ボーカロイド, translated as "Manual Vocaloid"). It is a re-edit of existing singing voices, extracting tones as .wav files and reassembling them. For this purpose, a support program was created. In March 2008, "Ameya/Ayame" (飴屋/菖蒲) released a free, advanced support tool as UTAU.

It was said that this program was developed as an answer to the very-expensive VOCALOID software.

Initially, the program came with only a sample voicebank, then only known as "Default". It gained popularity parallel to what VOCALOID had with Miku, with Teto's arrival to the UTAU scene. From there, many voicebanks were created.

Initially, UTAU was subpar to VOCALOID in terms of singing quality, but the author began developing the capabilities to the program until it became a viable substitute. For example, by 2010, the UTAU software was capable of supporting both triphones and software Plug-ins; both of which were not included in the capablities of the Vocaloid software until the vocaloid 3 version was released in October 2011.

Technical Information

UTAU is programmed in Visual Basic 6, and is encoded in UTF-16. It has provisions for localization, and is currently a closed-source software.


  1. UTAU Voicebanks, personified as UTAUloids.
  2. OREMO, a phoneme coding guide software aimed for UTAU voicebank making.

How to run UTAU

See this article.

How to synthesize songs with UTAU

See this article.


UTAUloids are names for the many different voicebanks used for UTAU. There are many UTAUloids, as more are created every week by YouTube and Niconico users.

A list of UTAUloids can be viewed here.

Further Reading

UTAU Usage Policy


External Links