desktop:

Image size:  600 x 1200 px 

File size: Max. 200 kB

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desktop:

Medium Rectangle

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Mobile:

Image size: 300 x 250 px

File size: 200 kB

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Instagram: 

• Square (1:1): 1440 x 1440 pixels.
• Landscape (max, 191:100): 1440 x 753 pixels.
• Portrait (min, 400:500): 1440 x 1800 pixels.

Highest Resolution: Upload the image at the highest resolution that meets the ratio requirements. There are no maximum resolution limits.

Facebook

• Standard (1.91:1 Ratio): 1440 x 754 pixels.
• 4:5 Ratio: 1440 x 1800 pixels.
• 1:1 Ratio: 1440 x 1440 pixels.

No maximum size restrictions.