Fed up with scheduling social media content that exceeds the character count or posting images that don’t look as good as they could? Then take a look at our social media guide and make your social media posts pop!

As each social platform has its own set of rules when it comes to image sizes and character counts, this is just one of many reasons why one size doesn’t fit all when it comes to your social content plan.

Start by getting the basics right – what exactly is the maximum social media post number of characters you can use, and more importantly, what’s the optimum length for each platform? And, how should you resize images so they look their best on different channels? Should you be using 40 characters or 125 characters? Should I add a call to action? What’s the difference per social network?

As a PR agency we make sure we’re always up to date with the guidelines, so please use our Team AMBITIOUS ‘at-a-glance guide’ to the social media post character limits and image sizes you need to know.


Facebook character limits:

  • Posts: 63,206 characters
  • Username: 50 characters
  • Page Description: 155 characters

What’s the best length for a Facebook post?

While Facebook allows you to post long-form, research shows that shorter is generally better when it comes to company posts. Try to aim for 40-80 characters to see if it increases engagement – Jeff Bullas claims that posts with 80 characters or less receive 66% higher engagement.

Facebook image sizes

  • Page Cover photo: 820 x 312 pixels desktop / 640 x 360 mobile
  • Profile photo: 170 x 170
  • Photo post: 476 x varied height


Twitter character limits:

  • Tweet: 280 characters
  • Direct Message: 10,000 characters
  • Handle: 15 character
  •  Profile Name: 20 characters

What’s the best length for a tweet?

Like Facebook, you are more likely to encourage people to engage with your tweets if they are shorter – aim for between 70 and 100 characters. And keep hashtags short, too – ideally to a single word and a few letters.

Twitter image sizes

  • Header image: 3:1 or 1,500 x 500 pixels
  • Profile image: 1:1 or 400 x 400
  • Tweeted Image: 16:9 or 1,200 x 675


Instagram character limits:

  • Instagram Caption Character Limit: 2,200 characters
  • Hashtag Limit: 30 hashtags
  • Bio Character Limit: 150 characters
  • Username Character Limit: 30 characters

What’s the best length for an Instagram post?

Instagram is primarily a visual platform, so it’s not surprising that, on the whole, posts with 150 characters maximum tend to perform better. Play with the Instagram bio character limit, use emojis to communicate your skills and offerings!

However, there is a growing trend for longer posts and longer-form storytelling on Instagram, and accounts that do this well can build some really meaningful engagement with their followers. It doesn’t work for everyone and depends on the nature of your business and what you have to say. Think carefully about your status update before publishing. It’s worth looking at some accounts that do this well to see if there are any opportunities for your business to try this out.

When it comes to hashtags, the Instagram hastag game is legendary. Use around nine hashtags on each post. And they can be longer than Twitter according to TrackMaven, whose research concluded that hashtags that are 21 to 24 characters long work best.

Instagram image sizes

Instagram posts aren’t limited to square, but images are cropped to square on your grid, so it’s worth making sure they still look good in a 1:1 format.

  • Profile Photo: 110 x 110 pixels minimum
  • Instagram photo size: minimum 1080 width for best quality – 1080 X 1080 for best square image
  • Landscape photo size: 1.91:1 proportion, or 1080 x 566
  • Portrait photo size: 4:5 proportion, or 1080 x 1350


LinkedIn character limits:

  • Page name: 50 characters
  • Company name: 100 characters
  • About us/Summary: 2,000 characters
  • Company update: 700 characters
  • LinkedIn Publishing post headline: 150 characters
  • LinkedIn Publishing content length: 120,000 characters

What’s the best length for a LinkedIn update?

Again, shorter is generally better here. The ‘see more’ button, cuts your message off at 140 characters, so it’s a good idea to stick to 25 words or less as the ideal length.

Head over to LinkedIn articles, however, and you can really wax lyrical. Paul Shapiro of Search Wilderness, analysed more than 3,000 of the most successful posts on LinkedIn’s publishing platform. He discovered that articles with between 1,900 and 2,000 words perform best.

LinkedIn image sizes

  • Profile cover photo: 1,584 wide by 396 pixels high or 4:1 proportion
  • Profile image: any square size from 400 x 400 pixels to 20,000 x 20,000
  • Blog post link: 1200 x 628
  • Photo share: 1200 x 1200 square is best for desktop, but gets cropped to horizontal on mobiles.

If you need more in-depth information on social media posts, we recommend you check out Louise Myers’ social media cheatsheet for image sizes and Influencer Marketing Hub for character limits of all kinds. Alternatively if you have any questions, let us know in the comments below – or connect with us on Twitter @Ambitiouspr.