Actually, it's not that complicated; you can use Word's built-in envelope feature.
Open Word, email – Chinese envelope – Envelope creation guide
Both small and large sizes are available; if you use it normally in China, C5 will be fine.
Then proceed step by step, selecting only what's needed and leaving the rest unselected. You can generate them individually or in bulk. A laser printer is sufficient for printing.
闽ICP备2021006864号-7
闽公网安备35020602002794号