What does /thumbnail do?
Purpose: Practical case study: Create a YouTube science thumbnail concept.
This is a custom prompt convention, not a built-in or official ChatGPT slash command. Entering the slash text alone does not guarantee that ChatGPT will invoke a special tool. Use the complete structured prompt below or configure your own app to interpret this shortcut.
Key decision for this workflow
Use /thumbnail when the task is design a youtube thumbnail for a lunar-eclipse explainer; specify the evidence needed to accept the result.
Copy-ready task brief
Reusable prompt template
How to use this shortcut
- Collect the source inputs: Verified footage still, title promise, channel palette and 16:9 safe area
- Run /thumbnail with the copy-ready task brief above.
- Request the concrete output: Thumbnail brief with one focal Moon image and three-word maximum text option
- Check the result: Preview at phone size and ensure thumbnail promise matches actual video
Quality checks and limitations
Acceptance criteria: Preview at phone size and ensure thumbnail promise matches actual video Limitation: Avoid fabricated celestial phenomena and misleading before/after imagery
Related tools and learning
Continue with the 35 prompt generators, the technical AI Guides, and the Image Guides for deeper examples.
Worked example and expected output
Input materials: Verified footage still, title promise, channel palette and 16:9 safe area
Requested result: Thumbnail brief with one focal Moon image and three-word maximum text option
Acceptance test: Preview at phone size and ensure thumbnail promise matches actual video
Practical case study: Create a YouTube science thumbnail concept
Starting brief: Video: why satellites look like moving stars; audience beginners.
Expected deliverable: Specify one clear subject, 3-word headline option, contrast hierarchy and mobile legibility.
Quality gate: Avoid misleading imagery that suggests satellites are meteors.
/thumbnail Task: Create a YouTube science thumbnail concept. Input: Video: why satellites look like moving stars; audience beginners. Deliverable: Specify one clear subject, 3-word headline option, contrast hierarchy and mobile legibility. Review: Avoid misleading imagery that suggests satellites are meteors.
Worked workflow: Design a YouTube thumbnail for a lunar-eclipse explainer
Practical scenario: Design a YouTube thumbnail for a lunar-eclipse explainer
Inputs to provide: Verified footage still, title promise, channel palette and 16:9 safe area
Requested deliverable: Thumbnail brief with one focal Moon image and three-word maximum text option
How to verify the result: Preview at phone size and ensure thumbnail promise matches actual video
Important limitation: Avoid fabricated celestial phenomena and misleading before/after imagery
Frequently asked questions
Is /thumbnail an official ChatGPT command? No. It is a reusable custom shorthand from this catalog. Does it work without a plugin? You can copy the full prompt into an assistant; automatic slash-command routing requires application logic. Can the output be trusted without review? No. Review accuracy, safety, and suitability before use.