There are several legitimate methods to get free diamonds in Free Fire in 2025. Some of the best ways include:

1. Google Opinion Rewards: Earn Google Play credits by completing quick surveys via the Google Opinion Rewards app. Use these credits to buy diamonds in Free Fire. Surveys may be location-based and not available everywhere.
2. Participate in In-Game Events: Garena frequently runs in-game events where completing certain tasks or missions can earn you diamonds. Keep an eye on the "Events" tab in the game and official social media channels for announcements.
3. Advanced Server Participation: By registering in Garena's Advance Server and reporting bugs, players can earn diamond rewards based on the severity of the bugs.
4. Redeem Codes: Garena distributes redeem codes during official events, livestreams, and esports tournaments that can be redeemed for diamonds and other rewards at their official redemption site.
5. BOOYAH App: This official Garena app offers live-streaming challenges, tournaments, and giveaways where players can earn diamonds.
6. Elite Pass: While mostly requiring purchase, completing free daily and seasonal missions on the Elite Pass may yield some diamond rewards.

Additional methods include referral programs and reward apps that provide gift cards or credits which can be converted into diamonds. It is essential to avoid fraudulent websites, diamond generators, and hacks as they can lead to account bans or harm your device. These methods provide safe and legal avenues to earn free diamonds in Free Fire in 2025.