Improve your thumbnail prompt in one click

Most prompts start like this: "thumbnail for my video about…". That is too vague to get a thumbnail that reads at small size. Improve the prompt does the rewriting for you, without replacing anything behind your back.

Improve the prompt

Under the source thumbnail, click Improve the prompt. Tick what the AI should reinforce:

• Composition: where elements go
• Visual hook: what catches the eye
• Mobile readability: what stays readable at small size

Visual hook and mobile readability are ticked by default. Click Rewrite (0.5 credit, refunded if the rewrite fails).

Replace or keep the original

The rewritten prompt shows up under yours. You choose: Replace or Keep the original. Nothing changes without your approval. Example from the video. The starting prompt:

thumbnail for my video vibe code vs agentic

becomes:

Me in the center, arms crossed, lit from the front. On the left a ruined shack, on the right a modern villa: before and after. "VIBE CODE" yellow and "AGENTIC" cyan banners at the bottom, huge. Readable at 120 px.

The rewrite keeps your @image1 and @sketch1 tokens, stays in your prompt's language, never describes your face and never invents text to display.

Reuse this run

On any run card, Reuse this run reloads the whole setup into the composer: prompt, source, person, references, sketch, number of variations and options. Nothing is generated. Change one word, then click Generate. To relaunch the exact same attempt, use Regenerate. Try it on your next prompt in YouThumb.