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Use Case: Thumbnail Maker (Works with Google Sheets)

Turn a video title into a thumbnail, social card and A/B options.

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Written by Victor Couto

🔌 Works best with your content sheet. Connect Google Sheets and Jeremy AI reads the next video title from your calendar. It only reads.

You finished a video. Now you need a thumbnail that gets clicks, plus a post to announce it. Give Jeremy AI your video title. It makes a bold YouTube thumbnail and a matching square Instagram card. Ask once more and it gives you 2 more thumbnails with new text, so you can A/B test the headline.

Who it's for

  • Coaches, course creators and agencies who post on YouTube.

  • Anyone who needs a thumbnail and a launch post without a designer.

Goal

Get a thumbnail, a matching social card and 2 test options in about 5 minutes.

What this build does

  • Turns your title into a short, bold headline (5 words or less).

  • Makes a high-contrast thumbnail: surprised face on one side, proof visual on the other.

  • Makes a matching 1:1 Instagram card with a "NEW VIDEO" badge.

  • Makes 2 more thumbnails with new headlines. It keeps the face, colors and layout the same, so the test isolates the headline.

  • Says what angle each headline tests.

When to use it

  • You're about to publish a video.

  • An old video's click-through rate is low and you want to test a new thumbnail.

  • You want a launch post that matches the thumbnail.

Before you start

  • A Jeremy AI account. Nothing to connect to try the sample.

  • Your video title and the visual idea (what goes on each side).

  • About 5 minutes.

Steps

  1. Open a new chat. Go to Chats and click Create a new chat.

  2. Paste the prompt. Use the thumbnail prompt below. Fill in your title and visual. Click Send message.

  3. Wait about 2 minutes. The thumbnail and the square card show up.

  4. Open and download. Click each image to open it in the viewer. Click download.

  5. Ask for A/B options. Send "Give me 2 more thumbnail options with different text so I can A/B test them." Wait about 1-2 minutes and download both.

  6. Crop to 16:9. The thumbnails come out about 1.49:1, not 16:9. Crop them to 1280x720 before you upload. Check the headline isn't cut off.

  7. Check them. Look for typos, odd faces and awkward line breaks.

  8. Upload it yourself. Use YouTube's Test & Compare to run the options.

Copy-paste prompt

Make a YouTube thumbnail for my video titled '[your video title]'. Big bold text, max 5 words, high contrast, [visual for the left side] on one side and [proof visual] on the other. 16:9 if you can. Then make a matching square social card for Instagram announcing the same video.

The exact prompts are in the walkthrough video.

Run it safely

  • Nothing gets posted. You upload the images yourself.

  • The faces are AI-made. Don't pass them off as you or a client.

  • Only use numbers in the headline that are true for you.

  • Check the crop. A center crop can cut off a top headline.

Expected result

Two thumbnails' worth of options plus a social card: one 2528x1696 thumbnail, one 2048x2048 square card, then 2 more 2528x1696 thumbnails. In our run: about 2 minutes for the first two images, about 1-2 minutes for the variants.

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