DPI different and PIXEL remain the same, will export to Web has different?

"I try to convince my team using higher dpi " ppi (the more fashionable name for dpi) is ignored when exporting for the web. It affects ONLY print output.

The size in pixels is what matters for the web. In print output the EFFECTIVE ppi is what matters, which is not based on the ppi in the file. Be sure you know what effective ppi is, that is the important thing, not a "magic number" in the file.

"we found out higher dpi display the complicated text nicer than 72 dpi in some situation. "

Can you post some examples?

You misunderstand.

The file is just pixels. Ppi comes later, it is not a property of the file.

Read it literally: pixels per inch. It means exactly what it says. So many image pixels to so many inches of paper. It's a measure of pixel density, and this determines print size.

On screen ppi doesn't apply. It's redundant, because the pixel density is already given by the screen pixel grid. The image pixels just align to that.

On paper there is no such pixel grid, so one has to be invented. That's ppi, pixels per inch.

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All that said, you can also use the ppi number as a guide to resampling the file to a different pixel size. This is a different story, and something you should not do unless absolutely necessary. In that case you are actually changing the data into something else.

I fail to see your point. DPI is meta information that merely tells a program how to interpret pixels in relation to physical dimensions. You need to educate yourself about such basic stuff. For video processing it doesn't even matter - all that After Effects cares for is absolute pixels. Similarly, file size is determined by the actual data stored, not its interpretation. A million pixels at 72 DPI is the same as a million pixels at 200 DPI. You have several gaps in your knowledge and misunderstandings here.

Mylenium