
Pictures for Facebook
Because the size of this social network, Facebook images are mostly utilitarian. Don't expect people to passionately explore them and pin them to their moodboards. However, Facebook supports a wide variety of sizes, so you can utilize them to build a solid brand image.
Profile picture

Pro Tip: People see this picture everywhere they stumble upon your page. Make sure it's a good one.
Image post

Pro Tip: Because posts with singular images take full width, you may use text as well as highly-detailed images. They will be easily recognizable and noticeable.
Cover photo

Pro Tip: Treat this like a billboard. Changing this picture regularly is usually a good decision. Experiment with images to see what your audience responds to best.

Pictures for Instagram
It's a part Facebook but it works different than Facebook itself. Today's Instagram is all about color palettes and visual aesthetics. People even design multiple images in a way that they look good together put into grid. Keep your images as visually appealing as possible.
Stories

Pro Tip: Because Instagram supports additional interactive Stories features such as stickers and polls, you can design your Stories cover with that in mind, carefully placing blank areas where interactive elements would be.
Square post

Pro Tip: It takes the full width, so you can use text and details. They will be seen. Consider not only that but the palette of the whole image as well because it will be shown both large and small.
Profile picture

Pro Tip: Keep your profile picture evergreen updating it as you travel or as the season changes. Try to match the palette and the overall visual aesthetic of your whole profile.
Even though supported, pictures are not the main part of Twitter feeds — text is the king. However, Twitter provides every way for you to design your profile to make it sleek and appealing.
Profile photo

Pro Tip: Create the whole new profile experience by matching your profile photo with your Header picture.
Post image

Pro Tip: It's slightly taller than an Open Graph image, but you may use Open Graph if you're designing a picture for the Twitter Card.
Header

Pro Tip: Because it will be displayed really wide, you can freely experiment with the layout. However, sometimes this image is cropped vertically, so don't put anything important to the very bottom of this image.

Pictures for YouTube
On the world's largest hosting for videos, pictures are still very important. On YouTube, they are the instrument of attracting new audience, less so of keeping the existing one entertained. As the platform changes and clickbait falls out of grace, it's better to keep video thumbnails informative and truthful.
Profile picture

Pro Tip: You can color-match your Profile picture with your Channel art to ensure premium experience. However, it's best not to leave your profile picture blank because it would also be displayed on its own.
Channel art

Pro Tip: Unlike in Twitter, on YouTube the channel art is not cropped vertically, so you can freely experiment with what content you put there.
Thumbnail

Pro Tip: Clickbait is a thing of the past. Nowadays it may damage how your audience perceives your channel. It's better to refrain from blank, filler thumbnails and instead choose the one that would be straight to the point.

Pictures for TikTok
This fast-paced social media was so influential that even YouTube made every attempt to catch on. Because of the speed of content consumption and its variety it's pretty much impossible to predict trends on TikTok, so the key is building the loyal audience that watches what you do because of who you are.
Vertical video ad
Pro Tip: Keep meaningful content away from edges and corners of the picture because TikTok UI features may obscure it.
Profile photo
Pro Tip: It's really small. Be careful with the details because they may not be recognizeable.

Pictures for Open Graph
Open Graph is your one stop shop for making your shared links beautiful whenever they're posted. Basically any social media, messenger and modern note-taking app supports it. If you have to choose just one image of one size, Open Graph is the way to go.

Pictures for Facebook
Because the size of this social network, Facebook images are mostly utilitarian. Don't expect people to passionately explore them and pin them to their moodboards. However, Facebook supports a wide variety of sizes, so you can utilize them to build a solid brand image.

Pictures for Facebook Ads
Remember that your ads will be cut by ad blockers. After that, they will be displayed among many others. Sometimes your ad will be put into a rotator that will switch between your ad and other people's ads several times each minute, so it's better to keep them recognizeable and straightforward.

Pictures for Google Banner Ads
Your ads will be displayed across countless websites that are part of Google Ad Network. Always test your images on different backgrounds to ensure they work in all circumstances.

Pictures for Instagram
It's a part Facebook but it works different than Facebook itself. Today's Instagram is all about color palettes and visual aesthetics. People even design multiple images in a way that they look good together put into grid. Keep your images as visually appealing as possible.
Even though supported, pictures are not the main part of Twitter feeds — text is the king. However, Twitter provides every way for you to design your profile to make it sleek and appealing.
Fleets images
Website card ad
App card ad
Carousels
Profile photo
Card image (min)
Post image
Video thumbnail
Conversation card
Direct message
Header

Pictures for YouTube
On the world's largest hosting for videos, pictures are still very important. On YouTube, they are the instrument of attracting new audience, less so of keeping the existing one entertained. As the platform changes and clickbait falls out of grace, it's better to keep video thumbnails informative and truthful.

Pictures for TikTok
This fast-paced social media was so influential that even YouTube made every attempt to catch on. Because of the speed of content consumption and its variety it's pretty much impossible to predict trends on TikTok, so the key is building the loyal audience that watches what you do because of who you are.

Pictures for LinkedIn
The number one professional social network even consider inappropriate some types of communication that are perfectly okay elsewhere. Because of its flexibility, LinkedIn allows you to customize your profile in every way you need to build your brand image while keeping it strictly professional.

Pictures for Pinterest
Visual aesthetics is importnat on any social media, but on Pinterest it's the only thing that matters. Even more than Instagram, Pinterest is focused entirely around visuals. This is the place where people build moodboards and design portfolios.

Pictures for Snapchat
Being slower than expected to grow on international markets, Snapchat has the most of its presence in the U.S. According to Insider and contrary to a popular belief, Snapchat user base isn't as young as some might think.

Pictures for Open Graph
Open Graph is your one stop shop for making your shared links beautiful whenever they're posted. Basically any social media, messenger and modern note-taking app supports it. If you have to choose just one image of one size, Open Graph is the way to go.

Pictures for Email
Fine-tuned image sizes for different mail clients including GMail, Outlook, Yahoo Mail, Apple Mail App, iCloud Mail and others.