Instagram highlight cover is smaller than the profile picture. It should be 1080 x 1920px.
My recommendation is to use a highlight cover having square dimensions, which is 2000 x 2000 pixels.
Instagram highlight cover format
IG highlight cover photo should be JPG or PNG file with high resolution. Make sure all the elements look visible.
Why your Instagram highlight cover matters
Instagram highlight cover is a small but powerful tool for promoting your business, services, or your brand. IG's feature should be appropriately utilized as a repetition of post-build trustworthiness and brand popularity.
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