How to Autogenerate Images for New Ghost Posts (Step by Step Tutorial)

In this tutorial, we will discuss how to automatically cross-promote your blog posts with the right image sizes for each social network.
by Juliet Edjere ·


    Sharing your blog posts on social media encourages an influx of new visitors to your site and drives a steady stream of social traffic.

    More importantly, if you want to increase traffic to your blog posts, how can you tailor your blog share messages to each social network?

    Visual posts receive a much higher amount of interaction than text posts. The images featured in your social feeds are the first thing people will see when they visit your profile. As you know, first impressions count.

    It's important to make sure that your social media visuals stand out in the best way possible on each social network. Thus, it's a good idea to review the image sizes that work best on each social network.

    What we will do

    This tutorial will guide you through how to automatically share the right image size to your social media network for every new post published on

    We will demonstrate how to effectively cross-promote your blog posts on social media by tailoring the share images to each social network.

    • Generate multiple images based on a Template Set on Bannerbear
    • These image cards are automatically posted on social media.

    You will need:

    • Ghost account and a site in Ghost
    • Bannerbear account
    • Zapier account
    • Pinterest, Twitter, Instagram and Facebook accounts

    Example Images

    By automatically optimizing your social media planning, you can improve reach and engagement with minimal manual effort.

    Now let's get into the steps to make your social media visuals stand out in the best way.

    Setup your Ghost Account

    Ghost is an open-source, professional publishing platform built on a modern Node. Ghost comes in two variants: hosted version on Ghost's own servers, or self-host Ghost on your own server, computer, or Raspberry Pi to have full control over your production environment. Creators can publish, share, and grow a business around their content.

    In order to use Ghost with Zapier, it is necessary to have a Ghost account. If you do not have one, you can create a Ghost account at //

    Add Zapier Integrations in Ghost

    To add integrations in Ghost:

    1. Log in to your Ghost account.

    2. From the left menu, click IntegrationZapier:

    Zapier screenshot for tutorial integration

    Retrieve your Ghost API Key to Zapier

    To connect your account to Zapier, you need to obtain your Admin API Key and Admin API URL.

    Copy the Admin API Key and Admin API URL to your clipboard. We will use this at a later step.

    Set up your Bannerbear Template

    Sign in to your Bannerbear account or create a new account.

    If you want to make sure your social media visuals stand out, it is worth looking into the image sizes best suited for the different social networks.

    Image size guidelines across social media platforms

    Now, let's take a glance at the ideal image post size guidelines for each social network so that you'll know exactly what to use.

    You will find that the aspect ratio, image size, and posting options vary.

    • Facebook Image post: 1200 x 630 px
    • Pinterest Pin: 1000 x 1500 px
    • Twitter Image post: 1200 x 670 px
    • Instagram Story: 1080 x 1920 px

    👀 Take a look at our Image size guide for a comprehensive list

    This gives you options for spreading and optimizing your content.

    Create a template set

    Navigate to your Projects page and create a new project:

    Bannerbear screenshot for tutorial integration

    A project must have 2 or more templates before you can create a Template Set. Click on 'Browse Template Library':

    Bannerbear screenshot for ghost tutorial integration

    Add these 4 templates to the project:

    Bannerbear screenshot for ghost tutorial integration

    Take note of the Template ID for each of these templates.

    Bear Tip 🐻: Template Sets work best with templates that have layers with consistent naming conventions.

    Next, ensure that the four templates we have added have the exact same layer names, so Bannerbear just merges them.

    Edit each template and rename the relevant layers accordingly:

    • Title
    • Feature Image
    • Authors Name
    • Published At
    • Authors Profile Image

    Bannerbear tutorial for template editor

    Now, it's time to group these templates together in a Template Set!

    Scroll through the project page to add the templates created to a template set. Hit the Create Template Set button and you'll create an empty set:‌

    How to create a template set on bannerbear

    After adding Templates to a Template Set, you can send a single payload of data to the /collections endpoint in order to generate a Collection of images in one go.‌

    Bear Tip 🐻: For a more detailed tutorial on how to auto-generate multiple image sizes at once using Bannerbear, visit this link.

    Get your Project API Key

    Bannerbear uses API keys to allow access to the API. You can get an API key by creating a project in Bannerbear.

    You can find the API key in your Project → Settings page:

    How to find Bannerbear API key

    Copy the API key to your clipboard.

    Zap Step #1: Start the Zap with a Ghost trigger

    Zapier is a tool that helps you automate repetitive tasks between two or more apps—no code necessary. A Zap is an automated workflow that tells your apps to follow this simple command: " When this happens, do that."

    With Zapier, you can set the following Ghost triggers:

    • when a new member is added
    • when a member is deleted
    • when a member is updated
    • when a page is published
    • when a post is published
    • when a post is scheduled.

    For this tutorial, we want to trigger an action when a post is published. Select Post Published from the trigger event dropdown:

    Bannerbear and Ghost integration screenshot

    Click Continue.

    Choose account and paste the API Key and API URL copied to your clipboard earlier:

    Authentication of Zapier to Ghost account

    Continue to test the trigger. Zapier will find a recent post in your Ghost account Ghost to confirm that the right account is connected:

    Ghost and Bannerbear integration screenshot

    If the trigger is set up correctly, Zapier will pull a post from your Ghost account:

    Trigger ghost and Zapier integration

    Click Continue. In the Zap editor, click the Action step, or click the plus + icon to add a step to your Zap.

    Zap Step #2: Create an Image Collection on Bannerbear

    Add an action - an event a Zap performs after it starts. Search for the Bannerbear app:

    Create an image collection on Bannerbear screenshot

    Choose Create Collection as the event. This generates multiple images based on the template set created earlier:

    Screenshot of Integration and collection of Bannerbear

    Click continue and sign into your Bannerbear account. To authorise access, enter the project API key retrieved earlier:

    Screenshot of Zapier permission to Bannerbear

    Click Continue to proceed to set up the action. Select the Template Set and map the modification fields to the Bannerbear layers:

    Set up trigger screenshot tutorial of Bannerbear and Zapier

    Bear Tip 🐻: Use Zapier Formatter’s Date/Time transform to reformat dates and times in your Zap. Once you've set up the Formatter Date/Time transform, you can use the results in further actions in your Zap.

    Proceed to Test & Continue:

    Screenshot of test action for the tutorial of Zapier integration

    If this works as planned, a collection will be sent to Bannerbear:

    Screenshot of test action on Bannerbear

    Check your Bannerbear template set page to preview the images. Each template will have a different image_url connected to the individual template ID:

    Tutorial step by step of integration between bannerbear and Zapier

    Next, we will set up automation to push these images to social media.

    Zap Step #3: Promote a new blog post

    We now know that each social network offers different image sizes and character limit options for promoting your content.

    Bear Tip 🐻: Remember to map the correct Template ID to each social media platform.

    1. Share on Facebook

    Add a new action to create page photo in Facebook Pages:

    Share on Facebook screenshot integration

    Click Continue. Proceed to link Zapier to Facebook and configure what Zapier can do with the Pages you want to use with Zapier.

    Set up the action by selecting your Facebook page and mapping the Photo and Description from the dropdown menu:

    Step by step promotion screenshots

    After the required fields are mapped, proceed to Test & Continue. A page post will be sent to the Facebook page with the image attached:

    Facebook post review

    2. Tweet It on Twitter

    Tweets with images on Twitter get almost 3 times as many interactions and generate 18% more clicks and 150% more retweets than text-only tweets.

    Add a new action to create a tweet on Twitter:

    Step by step Twitter integration with Bannerbear

    Click Continue and set up your Twitter account. Twitter limits you to 140 characters, so keeping your message short and simple is key.

    Twitter trigger on Zapier and Bannerbear

    To test Twitter, Zapier will create a new tweet with the information provided:

    Twitter promotion card

    3. Pin It on Pinterest

    On Pinterest, the image is the most important part of your pin.

    Add a new action to create a new Pin on the board you specify:

    Tutorial for pinterest promotion and Bannerbear

    Click Continue and sign in to Pinterest. Authorise Zapier to see all of your boards and create new Pins and boards for you.

    Use the description to convey what the pin is about:

    Tutorial on Pinterest integration with Bannerbear

    A pin will be sent to Pinterest:

    Pinterest promotion card with Bannerbear

    You can add more Zapier actions to automatically send these posts to other social media platforms.

    In the upper right, click to toggle the switch ON. Once your Zap is turned on, Zapier will run your action steps each time your trigger event occurs. Voilà! That's it.

    You can view a log of all your Zap activity, including all the data that goes in and out of each of your Zap steps, in your Zap History.

    Key Takeaways

    Cross-promoting your content on social media can help drive traffic to your blog. Taking advantage of the different features of each social network will help you cross-promote your blog posts effectively.

    However, there are different ways to post images on each social network. It is not enough to simply broadcast the same message across all social networks; you must tailor your message to fit each platform and audience.

    Thus, it's worth planning ahead by automating with Bannerbear so that you can make your social media visuals look their most professional.

    About the authorJuliet Edjere@juliethiri
    Juliet is a no-code expert and product strategist. Her expertise spans across products, technology and people, particularly solving user problems with no-code tools.

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    How to Autogenerate Images for New Ghost Posts (Step by Step Tutorial)
    How to Autogenerate Images for New Ghost Posts (Step by Step Tutorial)