Master Prompt Generator Pro
Reverse prompt engineering

Steal the recipe,
not the dish.

Found a page, video, image or piece of writing you wish you'd made? Drop it in. Master Prompt Generator Pro pulls out its DNA — structure, style, rhythm, palette — and rebuilds it as an advanced master prompt you can reuse on anything.

Extract a master prompt How it works
Free forever. Your uploads never leave your device.
01

Feed it the source

Paste a webpage URL, upload a video or image, or drop in raw text. The Lab reads structure, rhythm, palette and tone.

02

Get the DNA

You see exactly what was extracted — headings, shot list, color palette, sentence rhythm — nothing hidden, everything editable in your head.

03

Take the master prompt

An advanced, sectioned master prompt is assembled: role, blueprint, style lock, quality bar. Copy it, or AI-enhance it with your own key.

The Lab

Pick your source type. Everything is analyzed on your device — the free engine needs no account, no key, no upload to any server.

The Lab fetches a readable copy of the page (via a public reader proxy) and extracts headings, sections, CTAs, tone and structure. Login-walled pages can't be read.

Drop a video here or click to browse

MP4 / WebM / MOV — stays on your device
The Lab pulls frames across the timeline, reads duration, aspect ratio and palette, and drafts a shot-by-shot blueprint.

Drop an image here or click to browse

PNG / JPG / WebP — stays on your device
The Lab reads dimensions, aspect ratio, dominant palette, brightness and saturation to build the visual DNA.
The Lab measures sentence rhythm, vocabulary level, structural patterns and emotional temperature.

SOURCE DNA — WHAT WAS EXTRACTED

Your master prompt 

      

      

        
AI Enhance — pro-level rewrite

        
Paste your own Anthropic API key and the Lab sends the extracted DNA to Claude for a deeper, sharper master prompt. The key lives only in this tab's memory and is sent only to api.anthropic.com — never stored, never logged.

        

          
          
          
        

        
No Anthropic key? The free on-device engine above is already a complete, usable master prompt — Enhance just polishes it further.

      

    

  






  

    
Questions, answered

    
Is it really free?
Yes. The analysis engine runs entirely in your browser — no account, no credits, no uploads. AI Enhance is optional and uses your own Anthropic key, billed by Anthropic, not us.

    
Where does my video/image go?
Nowhere. Files are read by your browser's own video and canvas APIs and never leave your device. Close the tab and they're gone.

    
Why can't it read some URLs?
Pages behind logins, paywalls or aggressive bot protection can't be fetched by the reader proxy. For those, copy the visible text and use the Text tab instead.

    
Can I use the master prompt commercially?
The prompt is a structural recipe, not a copy — it captures patterns, not copyrighted text. Still, don't clone someone's brand assets, logos or distinctive creative work wholesale. Steal the recipe, not the dish.

  






  

    

      
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