Free AI Prompt Character Counter & Aspect Ratio Calculator
Live character, word and token counts for ChatGPT, Claude, Gemini, Midjourney, Stable Diffusion, FLUX and Sora — plus exact pixel dimensions for any aspect ratio. 100% free, private and fast.
Prompt character counters by AI model
Each tool is pre-tuned with that model's real limits and guidance.
Aspect ratio & pixel dimension calculators
Get exact pixel dimensions for AI art, wallpapers, print and social media.
Why use this tool
Live character & word count
Every stat updates instantly as you type — characters, words, lines and estimated tokens, no button to click.
Per-model token estimates
See an approximate token count and get instant guidance calibrated to ChatGPT, Claude, Gemini, Midjourney, Stable Diffusion, FLUX or Sora.
Dark mode
Switch between light and dark themes; your preference is remembered on your next visit.
Auto-save
Your draft prompt is automatically saved to your browser's local storage, so a refresh or accidental tab close won't lose your work.
Copy & share in one tap
Copy your prompt to the clipboard or use native Share to send it straight to another app.
No server, no sign-up
Everything runs as plain JavaScript in your browser — nothing you type is ever uploaded, logged, or stored on a server.
How it works
Paste your prompt
Type or paste your AI prompt into the box — nothing is uploaded, it all stays in your browser.
Pick your AI model
Switch the profile tab to ChatGPT, Claude, Gemini, Midjourney, Stable Diffusion, FLUX or Sora for model-specific guidance.
Copy or share when ready
Copy your prompt to the clipboard or share it directly once the length and guidance look right.
One counter, every major AI model
Writing prompts for ChatGPT, Claude or Gemini means working within large but very different context windows and product-level input limits. Writing for Midjourney, Stable Diffusion or FLUX means working within hard prompt caps and diminishing-returns word counts instead. This tool adapts its guidance to whichever one you're targeting, in one place.
Once your prompt is ready, jump to the Aspect Ratio Calculator to get the exact pixel dimensions and the Midjourney --ar parameter for your image, or check our blog for deeper prompt-writing guides.