How was the word Qianlong written during the Qianlong period?
Calligraphy fonts include line, grass, kai, Li and seal; Various ancient calligraphy styles, such as Yan Ti, Liu Ti, Wang Xizhi's running script, Dong Qichang and dozens of famous fonts.
There is no limit to the font in Qianlong period, and the word Qianlong can be written in any font. According to Baidu, Emperor Qianlong likes martial arts. But there is no such font converter, so I don't know what it looks like.