Important Tips: Write Effective Prompts for YouTube Thumbnail Generation

Keep the Prompt Length Moderate: A well-written prompt should have just enough detail—too little won’t guide the AI effectively, while too much may obscure the main focus. A good prompt is key to generating a high-quality YouTube thumbnail that accurately reflects your vision.
Place Key Elements at the Beginning: Important components like the main text, image style, and character details should be mentioned early in the prompt to ensure they are prioritized in the generated thumbnail.
Reference photos: When using a reference photo of a person, the prompt should mention the subject of the person and provide a corresponding description. Otherwise, the image may not reflect the corresponding person.
Refer to Examples, But Experiment: You can reference our example images and prompts to understand how to create your own prompts. However, it’s important to experiment with different combinations—use your creativity to discover unique and engaging outcomes. Experimenting with prompts allows you to generate thumbnails that stand out and draw viewers in.

If you’re unsure, use our prompt generator tool for guidance. Simply provide basic information, and it will generate prompts for you to refine.

Prompt Generator Tool: For example: input “a YouTube thumbnail, with the text 'hello, try this with fluxailab' on the left, and a woman pointing at the text on the right.” The prompt tool will then create a detailed prompt, which you can adjust to make your thumbnail more appealing.
AI describer: If you have an image that you would like to generate a similar image but don't know how to build the prompt, use our AI describer, just upload an image and it will help you build a description of the image, then you can choose what you'd like to keep, or modify it!

How to Create YouTube Thumbnail Using AI - Complete Guide

1. Determine Your Thumbnail Style, Layout, and Display Text

Conceptualize the Thumbnail: Start by deciding what kind of text, style, and layout you want for your thumbnail. For instance, you could include a phrase like "hello, try this with fluxailab" displayed on a whiteboard. You should also think about where the text should appear on the image and how it should look—these details will make your prompt more effective when generating thumbnails.

Specify the Image Style: Be clear about the style you want for your thumbnail. Whether it’s professional, cartoonish, or realistic, describing the intended style helps the AI create a more fitting thumbnail.
Include People (Optional): If your YouTube thumbnail involves people, describe their positions, appearance, expressions (e.g., surprised, scared, laughing), or posture (e.g., pointing at the text). Adding these specific details helps the AI generate a more engaging thumbnail that attracts viewers.

2. How to Control Thumbnail Style Using Lora Model (Optional)

Flux Lora allows you to adjust the style and appearance of your generated thumbnails with precision. You can control various aspects of the image generation process to match your desired aesthetic.

Selecting the LoRA: Choose from a wide variety of pre-trained LoRAs to control the style of the thumbnail. For example, you can use one LoRA to generate a professional look and another for a more vibrant, cartoonish style.
Adjusting the Weights: You can also fine-tune the intensity of each LoRA’s effect by adjusting the weight parameter. Increasing the weight will apply more influence from the selected LoRA, while lowering the weight gives the model more freedom to generate a balanced image. Typically, setting the weight between 0.5 and 0.8 is ideal for subtle control, but you can experiment based on your requirements.
Mix and Match LoRAs: To achieve more complex styles, you can combine multiple LoRAs, adjusting their respective weights to influence different parts of the image, such as background style, character features, or overall tone.

3. Using Reference Photos for Personalization(Optional)

Use Reference Photos for Personalization: For a personalized image, use the IP model by uploading a reference image. Ensure the reference expression matches what you want in the thum bnail. The best approach is to take a selfie that fits the expression you need and mention it in the prompt(important).

Enhance Creativity with Image Guides: You can increase the “image guide” setting to 5. This allows the AI to be more creative, though the character consistency might be less stable.