How to Make My Videos Hd From My iPhone To Youtube?

I been making videos on my iPhone and uploading them to youtube. They look great on my iphone but when I upload them to youtube they aren't as clear. I can't edited my videos on youtube right now because my internet is off. So is there something I could do on my phone to make my videos look better when or before I upload them to youtube?

> You can't increase the video quality of a video
> There's no software that will reliably improve the video quality

> You can only use some tweaks like increasing brightness or contrast etc.

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