If you need to obtain WhatsApp messages for use as evidence — whether messages already on your own device or messages you don't currently possess but need for a case — here's how this actually works procedurally, since the approach differs significantly depending on which situation applies to you.

If the messages are already on your own phone. This is the more straightforward scenario, and your task here is primarily about proper preservation and certification rather than "obtaining" something new. As discussed extensively throughout our conversation, any electronic evidence, including your own WhatsApp messages, requires the mandatory certificate under Section 63 of the Bharatiya Sakshya Adhiniyam, 2023 (the successor to Section 65B of the Evidence Act, made compulsory by the Supreme Court in Arjun Panditrao Khotkar v. Kailash Kushanrao Gorantyal, 2020) before it can be admitted in court. Your practical steps are: preserve the messages carefully without deleting or altering them, extract them properly (ideally through a screen recording of the full conversation thread showing timestamps and sender details, or a proper forensic export rather than isolated screenshots that can be challenged as selectively edited), and have your lawyer arrange for either your own certification (since you, as the device owner, occupy a "responsible position" in relation to it) or, for more contested or high-stakes matters, a professional forensic extraction and certification from a government Forensic Science Laboratory or a court-recognized private cyber forensic expert, as discussed in the earlier response regarding where to obtain Section 63 BSA certification.

If the messages are on someone else's phone or account, and you need to legally obtain them. This is considerably more restricted, since WhatsApp uses end-to-end encryption, and as a foreign entity (part of Meta), it doesn't directly hand over message content to Indian police, courts, or private individuals in the ordinary course, even upon request. The formal international mechanism for compelling this kind of data from a foreign company is the Mutual Legal Assistance Treaty (MLAT) process, which is slow, bureaucratically involved, and realistically reserved for serious criminal investigations where Indian law enforcement formally requests cooperation through diplomatic and legal channels — this isn't a practical route for routine civil disputes, matrimonial matters, or most private complaints.

The more practical route when messages exist on another person's device. If the specific device itself (belonging to the other party) becomes case property in a criminal investigation — meaning it's been seized by police as part of an FIR investigation — the investigating officer can have it forensically examined at a government FSL or an accredited private lab, extracting and certifying relevant WhatsApp data from that specific device, following the same Section 63 BSA certification requirement, with the added evidentiary strength of proper chain-of-custody documentation since it went through formal police seizure and forensic examination procedures rather than an informal or private extraction.

If you're the complainant in a criminal case and specific WhatsApp messages on the accused's phone are relevant to your case. You can request the investigating officer to specifically seize the relevant device and have it forensically examined, and if the investigating officer is slow to act on this, your lawyer can file an application before the Magistrate under Section 94 of the Bharatiya Nagarik Suraksha Sanhita, 2023 (Section 91 CrPC, discussed extensively throughout our conversation), specifically directing that this evidence be secured and examined given its relevance to the ongoing investigation.

If you're pursuing a civil matter and need WhatsApp data from the opposing party. Your lawyer can seek a court order (an application within your civil suit) directing the opposing party to produce their device or relevant data for examination, similar to discovery procedures generally, though compliance here depends on the opposing party's cooperation, and if they refuse, the court can draw adverse inferences against them for withholding relevant evidence, which itself can work in your favour even without directly accessing the actual messages.

Limited metadata versus full content. It's worth understanding that even where formal legal process is pursued, WhatsApp (through the MLAT route or otherwise) is generally more willing and able to provide limited metadata (such as account registration details, or very limited technical information) rather than actual message content, given its end-to-end encryption architecture, which technically means WhatsApp itself often cannot access message content even if compelled to, since it's encrypted in a way the company itself doesn't hold the decryption capability for standard message content — this is a genuine technical limitation, not merely a policy reluctance, and it's important to have realistic expectations about what's achievable through formal requests to WhatsApp directly, as opposed to obtaining the messages from an actual device where they're stored in readable form.

Practical bottom line for most situations. For the vast majority of practical purposes — whether you're building a criminal complaint, defending yourself, or pursuing a civil matter — the realistic and effective route to WhatsApp messages you don't already possess is through proper forensic examination of the actual physical device (yours if you have access, or the other party's device once it's been legally obtained through seizure in a criminal investigation or court-directed production in a civil matter), rather than attempting to obtain this data directly from WhatsApp/Meta as a company, which remains genuinely difficult, slow, and often technically limited even when pursued through the correct formal channels.

Conclusion: For WhatsApp messages already on your own device, focus on proper preservation and Section 63 BSA certification rather than any "obtaining" process; for messages on someone else's device, the practical and effective route is through forensic examination of that physical device once it's legally secured, either through police seizure in a criminal investigation (with your lawyer pushing for this via a Section 94 BNSS application if the investigating officer is slow) or court-directed production in a civil matter, since directly obtaining message content from WhatsApp as a company remains both technically limited by its encryption and procedurally difficult through the slow MLAT process. You can reach out to the team at Aapka Legal Advice to have your specific evidence needs and strategy reviewed, and this list of Top Criminal Lawyers in India | Aapka Legal Advice can help you find suitable representation to pursue this properly.