noun, noun or participle which takes 'suru'
big thanks; great gratitude
Expresses a strong, heartfelt thank you. Often used in casual or enthusiastic contexts, such as social media, personal messages, or informal announcements.
プレゼントをもらって大感謝！
I'm so grateful for the present!
皆さんに大感謝しています。
I'm really thankful to everyone.
感謝 is the standard neutral word for 'gratitude' or 'thanks'. 大感謝 is a more emphatic, casual expression.
Compound of 大 (dai, 'big') + 感謝 (kansha, 'gratitude'). A straightforward emphatic form.