Dipke, the founder of the Cockroach Janta Party, and the other leaders were detained when their plane landed in Delhi on Saturday as the movement planned to gather thousands of people at Jantar Mantar in Central Delhi.
They were produced in front of a magistrate early on Sunday.
"Condition - no breach of peace for one year," the CJP's legal head Ratna Singh said in a post on X announcing their release.
Activist and social media influencer Dhruv Rathee, who was also among those detained, was released past midnight on condition he did not participate in any further protests, said an interior ministry official who declined to be named.
Police detained more than 2000 people and locked down Delhi's city centre to thwart Saturday's protest, and thousands of police and paramilitary personnel continued to be deployed across the city on Sunday although metro stations reopened and mobile internet services were back up.
Most of those detained on the first day of protests were released late on Saturday night, police said.
Opposition parties and critics of Prime Minister Narendra Modi's government criticised what they said was the high-handed use of force against the protesters, while a UN body called on authorities to ensure that the right to peaceful assembly was respected and fulfilled.
India's foreign ministry said on Sunday the UN's approach was "selective" and its statement constituted "an unwarranted interference in the internal affairs of India."
The protests are calling for the resignation of Chief Election Commissioner Gyanesh Kumar over a revision of voter lists that critics say disproportionately benefits Modi's ruling Bharatiya Janata Party (BJP), which has been in power for more than 12 years.
Modi's BJP has accused groups opposed to it of trying to undermine the country's democracy by wrongly questioning legitimate electoral processes.
Election Commission data cited by the party shows about 130 million names, more than the population of Japan, have been deleted from electoral rolls during the verification exercise, including 63 million people who had relocated and 30 million who could not be traced.
The cockroach party, which began as an online satire, rapidly evolved into a pressure group, with street protests against exam paper leaks culminating in the resignation of Modi's education minister.
Police detained Dipke and senior leaders Saurav Das and Ashutosh Ranka when their flight from Mumbai landed in Delhi, the group said in a statement.
Television footage showed Dipke challenging officers who approached him on board the aircraft.
"I have come to be arrested, arrest me ... I am not afraid of you guys," he said.
"No, this is not an arrest," one officer replied. "Please co-operate."
The movement condemned what it called the "authoritarian detention" of its leaders, demanded their release and vowed to continue protesting.
"We will continue our protest tomorrow, day after ... until Gyanesh Kumar resigns. We will be on the streets," CJP leader Ajinkya Shinde told reporters.
CJP also said authorities refused to provide updates on the leaders' whereabouts or health, even after news arrived of the death of Dipke's grandmother. Police said Dipke was informed of her death and was offered help to return home for the funeral.
Across the capital of about 20 million people, security forces set up checkpoints on major roads and entry points, boarded buses searching for protesters and inspected vehicles.
Barricades and concrete blocks disrupted traffic while anti-riot vehicles equipped with tear-gas launchers guarded key routes.
The demonstrations represent one of the most serious tests yet for Modi, stemming from allegations that election authorities improperly revised voter rolls ahead of recent state polls.
Protests intensified after the Indian Express reported last week that two election commissioners had questioned Kumar's voter-list revisions that removed roughly 130 million names from voter lists.
The unrest also comes ahead of a series of important state elections beginning in early 2027.
