Why do the images get blurry when posted on Social media?

[amarvilks]

I created thread before but haven't been here for long time and wasn't sure on responses. 

So if anyone knows perhaps I'm doing a setting wrong or whatever.

Anyhow, I create images on designer on 300dpi and export as png.

Now, on my site or websites shall i say the clarity is fine, seems good resolution. But if posted images on FB or twitter the images are not as sharp anymore infact kind of blurry.

I used to make images on canva and when posted on social media they remain super sharp, so why does the affinity files become 'low-resolution' looking when posted on social media?

[Pšenda]

1 hour ago, amarvilks said:

I created thread before but haven't been here for long time and wasn't sure on responses. 

Click on your name - show all your content.

 

Or set "Notify me of replies" (in your account settings can be set for all your other posts automatically).

[Pšenda]

1 hour ago, amarvilks said:

But if posted images on FB or twitter the images are not as sharp anymore infact kind of blurry.

I used to make images on canva and when posted on social media they remain super sharp

Example for compare? 

[IanSG]

2 hours ago, amarvilks said:

Anyhow, I create images on designer on 300dpi and export as png.

 

2 hours ago, amarvilks said:

I used to make images on canva and when posted on social media they remain super sharp, 

Are the "canvas" images .png as well, and do those old images remain sharp if you repost them now?