I've done a few border runs in my time just the walk over ones. As I stand there I see the Thai and Malaysian come and go seemly no checks ??? . I'm off to Kuala Lumpur soon for a few days and you know it is my Thai lady friend says I come I come. So the question is do a Thai need a passport to go to Malaysia ?
TLDR : Answer Summary
Thai citizens generally need a passport to enter Malaysia. However, they may cross the border by land using a valid national ID card, especially in specific cases near the border with countries like Laos. It's important to note that for air travel, a passport is required due to formal immigration processes.