Social media is a constant changing environment and every time you turn around, the images sizes have changed. It becomes frustrating to know what size you should be using, especially since there is no standard. Every social media platform has its own specifications.
Sprout Social has taken the pain out of knowing what size you need, with their always up-to-date Google Doc with social media image sizes. Their Always Up-To-Date Social Media Image Sizes Cheat Sheet gives you instructions, plus a tab for each social media platform so you can instantly review what the correct size is for each platform, currently.
Here is a quick run down of the recommended Dimensions:
Twitter Image Size Guide:
Profile Photo: 400 x400
Header: 1500 x 500
In-stream photo: 506 x 253
Facebook Image Size Guide:
Profile Photo: 180×180
Cover Photo: 828×315
Shared Image (Timeline): 1200 x 630
Shared Image (Newsfeed): 1200×630
Shared Link (Timeline): 1200×630
Shared Link (Newsfeed): 1200×630
Highlighted Image: 1200×717
Pinterest Image Size Guide:
Profile Picture: 165×165
Pin Board (large thumbnail): 222×150
Pin Board (smaller thumbnail): 55×55
Instagram Image Size Guide:
Profile Picture:110×110
Photo Thumbnails: 161×161
Photo Size (Instagram App): 1080×1080
