AI Image Generator for Social Media | Sizes & Examples

Social media is one of the most popular channels for connecting with your target audience, but it can be challenging to maintain a steady posting rhythm. Designing fresh, high-quality graphics consistently can be time-consuming and expensive if you’re relying on stock photos or professional design tools.

That’s where an AI image generator comes in. The right tool can help you instantly create custom images tailored to your goal and style on each social network—without expensive licenses or advanced design skills.

Use QuillBot’s free AI image generator for social media posts today. Input your desired aspect ratio, preferred image style, and prompt to generate social media posts in seconds.

Social media image sizes

Social media image sizes vary by network and purpose. If using an AI image generator for social media posts, it’s a good idea to know what size image you need. The table below outlines the most common sizes for the most popular networks.

General tips for using the AI image generator

Before looking at individual use cases, here are some general tips you should keep in mind when using the AI image generator for social media posts:

• The more detailed your prompt, the better: Include as many specific details in your prompt as you can. The more context you provide, the less the image generator has to “guess,” which means the output will be closer to what you’d imagined.
• Play with styles: If the first image you generate doesn’t match your expectations, try changing the style. For example, “artistic” may yield better results than “cinematic.” If you’re not sure what to choose, try “auto.”
• Understand aspect ratio: Aspect ratio is the relationship between the width and height of an image. It’s usually written as two numbers separated by a colon. If both numbers are the same (e.g., 1:1), the image is a square. If the first number is bigger (e.g., 16:9), the image is landscape (i.e., wider than it is tall). If the second number is bigger (e.g., 9:16), the image is portrait (i.e., taller than it is wide). Even if you change the size of the image, the aspect ratio stays the same as long as the size grows or shrinks proportionately.
• Review images before saving: QuillBot’s AI image generator automatically creates two variations based on your prompt. Review these and choose the one you prefer. Pay special attention to text and “complicated” body parts (e.g., fingers, toes, eyes), as these are areas that all AI image tools sometimes don’t get quite right. Once you’ve chosen, click the down-arrow icon to download the image.

Instagram post generator

An effective Instagram post combines eye-catching visuals and value. Think high-quality photos or videos and attractive aesthetics combined with a clear intention to entertain, educate, persuade, engage, or inspire.

Some sample prompts for generating Instagram posts are:

• Instagram post of the motivational quote “You are enough right now where you are.” with an abstract watercolor background in soft pinks, purples, and blues. Use the Instagram graphic design style and the font Montserrat in white, and don’t leave any white space in the background.
• A cozy living room with sunlight coming through the window, boho decor, neutral tones, Instagram lifestyle vibe. Format as an Instagram post and leave space at the top right so I can add text later.
• Create a portrait Instagram post of a brick wall with hip, colorful graffiti sprayed on it, spelling out “summer sale.”

YouTube banner maker

Your YouTube banner is the first thing visitors see when they land on your channel, so use it to make a strong impression. A good YouTube banner should reflect your brand identity and personality.

A few sample prompts for making YouTube banners are:

• A YouTube banner with an elegant minimalist design with a black background and gold accents, luxury brand style, with a wide panoramic format.
• Travel-themed collage of beaches, mountains, and famous landmarks. Cohesive color grading; bright and inviting. YouTube banner layout.
• Create a YouTube banner for a tech YouTube channel. Use a clean and modern banner with geometric shapes in blue and silver and a futuristic theme.

YouTube thumbnail maker

Learning how to make a thumbnail for YouTube is an important step in any YouTuber’s growth. Attractive thumbnails can help you get more views and help returning viewers more easily navigate your video library.

To make a thumbnail for YouTube with AI, you might use a prompt like:

• Make a YouTube thumbnail with a cartoon-style explosion with the words “TOP 5 SECRETS” in bold white font, a red background, and a dynamic comic design.
• Create a YouTube thumbnail for my fitness video. It should show a trainer mid-workout in a gym, in an energetic pose. Use a bold red and black color scheme and leave space at the left for large text.
• Make a YouTube thumbnail that features a mosaic of flags of the world on a white background. Leave a rectangular space in the middle with no flags, and put bold text: “Fun with flags” in a bold, clear font.

Twitch banner maker

Your Twitch banner is the visual anchor of your channel. It appears at the top of your profile and sets the tone for your brand. A strong banner is eye-catching, readable, and consistent with your channel’s theme.

Some sample prompts for making Twitch banners are:

• Make a Twitch banner with a dark sci-fi gaming background that features glowing blue neon lines. Leave space at the left for the channel name.
• Create a Twitch banner that shows a cartoon-style battle arena with characters fighting, using the style of old arcade fighting games. Use vibrant colors and focus the graphics at the left of the banner.
• Generate a Twitch banner with a lavender background and small, pink, puffy, smiling clouds scattered throughout it.

Facebook cover photo maker

Your Facebook cover photo is prime real estate at the top of your profile. The best cover photos are clean and aligned with what you want your profile to transmit: professionalism, creativity, warmth, etc.

A few sample prompts for making a Facebook cover photo with AI are:

• Create a Facebook cover photo showing a modern office with warm lighting and plants. It should have a professional branding vibe.
• Generate a Facebook cover photo with a bold graphic design featuring jewel-tone colors and geometric shapes. It should be reminiscent of tiles like you’d see in the Alhambra in Spain or in Portugal.
• Make a Facebook cover photo showing a beach sunset, with the sky in shades of pink and gold.

Twitter banner maker

Your Twitter banner—or rather, X banner—is one of the first things people see when they visit your profile. Due to its size and positioning, you should use bold, simple visuals. Position text and logos toward the center so they aren’t cut off on different screens.

These sample prompts can give you an idea of how to use a Twitter banner maker:

• Generate a Twitter banner with a playful cartoon-style banner with clouds, stars, and colorful icons.
• Create a Twitter banner. It should be a gentle purple gradient with a dotted white line around the border. Leave space in the middle so I can add text later.
• Make a Twitter banner with a light blue sky and a rainbow arching diagonally from the bottom left to the top right.

Frequently asked questions about AI image generator for social media posts

How do you design social media posts?

To design social media posts:

1. Choose the right size for each platform and format
2. Decide what the goal of the post is
3. Make sure any photos and videos are in a high enough quality for the network
4. Choose colors, fonts, and visuals that align with your brand and/or goal
5. Proofread all copy (with Grammar Checker, for example)
6. Publish or schedule your post

If you want to design social media posts with an AI image generator, QuillBot’s AI image generator is free to try today!

How do you schedule social media posts?

To schedule social media posts, check if the network itself allows scheduling. If not, use an external social media scheduling tool.

In general, to schedule a post:

• Upload the content.
• Choose a date and time.
• Click “schedule.”

Scheduling social media posts is a great strategy when you create content in batches. To write a bunch of social posts at one time, try a social media post generator, like QuillBot’s free social media post maker.

How many images are in an Instagram carousel?

There are up to 20 images in an Instagram carousel. You can add fewer, but that is the maximum number of images you can add to one carousel.

If you want to try using an AI image generator for social media posts you can upload as an Instagram carousel, try QuillBot’s AI image generator.