Both 网上 and 在线 mean "online". What is the difference between 网上 and 在线?
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more examples at bkrs: 网上 on the net,#2255, 网上邻居,放到网上,在网上流传,网上年度报告,他成天在网上, many more, 在线 comp. online #17378,在线采访,在线预订,在线翻译,在线出版物,在线数据输入,在线商务信息, many more – user6065 Aug 10 '18 at 1:41
Specifically, although “网上” and “在线” can be both translated as "oline", “网上” actually means "on the internet", “在线” means "online".
Here are some examples
我在网上找到了这篇文章。
It means, I found this article online.
我的 QQ 是在线的。
This means, the status of my QQ is online.
Although they were both translated to "online", I bet you can see the difference there with actual examples.
在线 is more for instant messenger like facebook/whatsapp status that you are online.
网上 is for website elements, for example, an online forum, online application.