Do you need to know more about what are the recommended image sizes for social media?
Do you need a Social Media Image Sizes Cheat Sheet?
You present yourself best on social media if you get the image size tailored to the site.
The problem is all the different social media sites have different image size requirements.
Below you can find various helpful cheat sheets

Social Media Image Sizes Guides
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This is a round-up of the guides to the best social media guides online.

The Ultimate Social Media Image Size Guide for 2021 | Agency Analytics
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This post The Ultimate Guide to Social Media Image Sizes in 2021 [Infographic] (January 2021) provides you with an always up-to-date cheat sheet of social media image sizes in 2021 for the following social media platforms: See the example for Facebook below - use this link to see a more precise version

The 2021 Image Size Cheat Sheet | makewebsitehub.com

The 2021 Social Media Images Sizes Cheat Sheet can be downloaded as a PDF file from makeawebsitehub.com. 

​It covers these social media platforms:
  • Facebook
  • LinkedIn
  • YouTube
  • Instagram
  • Twitter
  • Pinterest
  • Tumblr
  • Google+
  • Ello
  • WeChat
  • Weibo
  • Snapchat
​Do go to the website and read the helpful notes (below the infographic) about how best to optimize images for different social media sites in terms of::
  • pixel height and width dimensions
  • the best sort of image to use
  • resolution
  • file size
  • embedding
  • where and when an image will be seen​​
Picture
EXAMPLE: This is the page about images sizes for Facebook - providing details about pixel numbers and file sizes

Always up to date guide to social media sizes | sproutsocial
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 The main advantage of the ​Always Up-to-Date Guide to Social Media Image Sizes  is that it doesn't produce one version per year - but rather updates as time passes.