Initially, it started as an independent project called Blogmusik, which allowed users to stream music directly from the web.

[8] The site was relaunched as Deezer in August 2007 after reaching an agreement with SACEM, a French organization that manages music copyrights.

Additionally, Deezer allowed users to download songs streamed on the platform through iTunes, earning a commission for each purchase made.

In its first month of operation, Deezer's website attracted approximately 773,000 visitors, and its popularity grew rapidly over the following years.

While continuing basic free web streaming, the company also introduced two subscription services: users paying €4.99 monthly received higher audio quality music without ads, and users paying €9.99 monthly gained access to downloadable applications for computers, as well as Android, BlackBerry and iOS mobile devices.

[16] On 7 December 2011, Deezer, at the time available only in Belgium, France and the United Kingdom, announced plans to expand worldwide during the rest of 2011 and continuing into 2012.

[20] On 15 August, Deezer announced it would be available in Indonesia, Malaysia, Pakistan, the Philippines, Singapore, and Thailand within several weeks.

[23] CEO Dauchez said that Deezer was also looking for a partner to introduce service in the United States, who was "able to provide us with a significant volume of subscribers" to help offset what he called the "unbelievably high" costs of entering the US market.

[24] In January 2013, Deezer announced its expansion into 22 new countries across Africa, Asia, Brazil, the Middle East, and the United States, bringing its total to 182.

Chromecast support became available to Deezer Premium+ users from 25 June 2014 onwards in Australia, Belgium, Brazil, Canada, Finland, France, Germany, the Netherlands, Norway, Portugal, South Korea, Spain, Sweden, Switzerland, and the United Kingdom.

In the US, Deezer HiFi offers 36 million tracks of 16-Bit/44.1 kHz of FLAC quality music for a $19.95 monthly subscription.

In July 2021, Deezer announced that free account users could use Google Assistant speakers to stream music.

[50] In June 2023, Deezer announced the launch of an AI-based tool designed to identify and label songs utilizing artificially generated vocal duplicates.

[51] In September 2023, it was announced that Deezer and Universal Music Group had struck a deal to change the way royalty payments were split between artists.

[52] In November 2023, Deezer announced a new brand identity, changing the app's logo to a stylized purple heart, and rebranding as an "experience services platform".