WhatsApp launches court action against India's social media clampdown
The regulations, which took effect the same day, come at a time of growing tensions between social media giants and the Indian government, which has demanded tech companies remove content critical of Prime Minister Narendra Modi.
The Facebook subsidiary did not give details of the legal action but made clear its opposition to the new guidelines that would also affect Twitter, Instagram and other platforms.
The new rules demand "traceability" of messages, which requires social media companies to give details of the "first originator" of posts deemed to undermine India's sovereignty, state security or public order.
They also require platforms to take down posts depicting nudity or manipulated photos within 24 hours of receiving a complaint.
"Requiring messaging apps to 'trace' chats is the equivalent of asking us to keep a fingerprint of every single message sent on WhatsApp, which would break end-to-end encryption and fundamentally undermines people's right to privacy," WhatsApp said in a statement.
Facebook and Google have said they are working towards complying with the guidelines.
But it has been accused of seeking to crack down on criticism from the public.
Police this week visited Twitter's offices in New Delhi as part of an investigation into the company's move to mark a tweet by a spokesman for the ruling Bharatiya Janata Party as "manipulated media".
Sambit Patra had shared a document that purported to be a plan from the opposition Congress party to malign the government's response to the Covid-19 pandemic.
Congress said the document was a fake.
The government last month ordered Twitter and Facebook to remove dozens of posts critical of Prime Minister Modi's handling of the coronavirus crisis.
Twitter had earlier agreed to a government request to ban some accounts criticising new agricultural laws that have sparked six months of protests by disgruntled farmers.
The platform reversed the ban in February.