Upload the image
A photo, a render, an illustration, a screenshot of a design you like. PNG, JPG and WebP up to 12 MB work.
Image to Prompt
Free image to prompt generator. Upload any picture and get a detailed AI prompt covering subject, style, lighting and composition. No sign-up.
Home / AI tools / Image to Prompt
Drop your image here or click to upload
PNG, JPG or WebP, up to 12 MB. Larger images are resized before analysis.
Prompt style: Detailed prompt, Short prompt, Keywords
One free run per visitor, verified automatically, no account needed.
How it works
How to turn an image into a prompt in three steps
No tagging, no guesswork. Upload, pick a style, copy the prompt.
Pick a prompt style
Detailed for a full paragraph with subject, style, lighting and camera; short for one tight sentence; keywords for a comma separated tag list.
Copy and generate
Paste the prompt into any image generator, or continue inside Krater and generate with Flux, Nano Banana, GPT Image or Seedream right away.
Image in, prompt out
Image to prompt examples
Every prompt below was generated on Krater from the image shown, with the prompt style noted underneath. Use them as a reference for how specific the output gets.
Beauty portrait
A smiling young woman with wavy brown hair holds a pink and blue jar labeled "Collagen Boost" in front of a soft-focus, bright window setting. The lighting is gentle and diffused, creating a radiant glow on her skin, with a delicate color palette of soft pinks, peaches, and blues. Captured with a medium shot, the image has a clean, professional beauty photography style, emphasizing natural skin and a healthy complexion.
Prompt style: Detailed prompt
Product photo
A woman's hands, adorned with bold red nails and luxurious gold jewelry, reach for a vintage red rotary phone within a retro red phone booth. The lighting is bright and even, highlighting the vibrant scarlet hues that dominate the scene, creating a striking and stylized aesthetic. The image is captured with a medium format camera, emphasizing a fashion photography style with a sharp focus on the details.
Prompt style: Detailed prompt
Interior
Minimalist interior with a view of a Japanese courtyard and a solitary bonsai tree, warm wood accents and soft lighting.
Prompt style: Short prompt
Landscape
A mystical fantasy landscape featuring a winding river flowing through a valley surrounded by towering, mist-shrouded mountains. On the right, a magnificent waterfall cascades down a rocky cliff, leading to an ancient, ornate temple perched precariously high. A large, gnarled tree dominates the left foreground, with dramatic, ethereal lighting filtering through the soft, atmospheric haze. The color palette is dominated by muted greens, grays, and soft blues, with hints of golden light. The style is that of a highly detailed digital painting, capturing a sense of wonder and enchantment.
Prompt style: Detailed prompt
Illustration
futuristic train, cyberpunk city, gritty, rusty, neon lights, moody atmosphere, cinematic, digital art, muted colors, science fiction, urban decay, train station, dystopian, fog
Prompt style: Keywords
Drink photo
A glass of amber whiskey with a large, faceted ice cube on a concrete surface with a grey background.
Prompt style: Short prompt
Reverse prompting
What an image to prompt generator does
An image to prompt generator looks at a picture and writes the text prompt that would produce it: subject, setting, style, medium, lighting, color palette, camera and composition. It is the reverse of an image generator, which is why people also call it a reverse prompt tool or an AI image describer.
It solves the hardest part of AI image generation, which is finding the words. When you have a reference you love, whether a competitor's ad, a mood board frame or a photo from your own archive, the generated prompt captures what makes it work so you can recreate the look on your own subject, in any generator, and adapt it with a few edits.
On this page you can describe one image free with Gemini Flash. Inside Krater you can use every vision model we host, generate from the prompt immediately with Flux, Nano Banana, GPT Image or Seedream, and keep iterating in the same chat.
Every vision and image model in one place
Describe with one model, generate with another
The free run uses Gemini Flash to read your image. Inside Krater you can describe with GPT-5, Claude or Gemini Pro, then send the prompt straight to Flux, Nano Banana, GPT Image or Seedream in the same chat.
Techniques
Detailed, short, keywords: which prompt style to use
Different generators and different goals want different prompts. Pick the style that matches where the prompt is going.
Detailed prompt
A full paragraph covering subject, style, lighting, lens and mood. Best for photoreal generators and when you want the closest recreation of the reference.
Short prompt
One tight sentence with the essentials. Best as a starting point you will edit, and for models that follow concise instructions well.
Keywords
A comma separated tag list of subject, style and technical terms. Best for tag driven generators, stock search and asset libraries.
Description and alt text
Use the short prompt as accessible alt text or a product description. It names what is in the picture in plain, specific language.
How to get the most useful prompt
- Upload the cleanest version of the reference you have; text overlays and watermarks end up in the description.
- Swap the subject in the generated prompt and keep the rest to apply the same style to your own product or person.
- Generate a detailed prompt first and remove what you do not need; it is faster than adding detail to a short one.
- Run the prompt through two or three generators inside Krater; the same words render differently on each model.
What people describe
From reference image to repeatable prompt
Prompts are the raw material of every AI image workflow. Extracting them from images you already like makes results consistent and fast.
Recreate a look on your product
Describe a competitor's or a reference lifestyle shot, swap in your product and generate a matching image.
Brand consistent visuals
Turn your best performing creatives into prompts your whole team reuses for new campaigns.
Mood boards to prompts
Convert each board reference into a prompt and iterate on variations without redesigning from scratch.
Alt text and descriptions
Generate accurate, specific descriptions for accessibility, SEO and product catalogs.
Learn prompt writing
See how professionals' images decompose into style, lighting and camera terms, and borrow the vocabulary.
Tag and search assets
Produce keyword lists for stock libraries, DAM systems and internal asset search.
Suitable for everyone
One image to prompt tool for every kind of work
Whether you describe one reference or build a prompt library for a team, the model and the quality are the same. Inside Krater you also get every vision and image model in one chat.
Marketing and ecommerce teams
Recreate winning ad and listing looks on your own products with consistent prompts.
Designers and art directors
Translate mood boards and references into prompts you can iterate on in minutes.
Agencies
Build reusable prompt libraries per client so every generated visual stays on brand.
Content creators
Describe images you admire and generate your own take with any model.
Photographers and illustrators
Turn your portfolio into prompt vocabulary and explore variations of your own style.
Anyone new to AI images
Skip the blank prompt box: start from a picture you like and learn the words as you go.
Every vision and image model, every app
Your prompts and images, finally in one place
Vision models, image generators, editors and the apps you already use, all inside one workspace.
Why Krater
Image to prompt plus every leading model, one workspace
Krater is The All-in-One AI Workspace. Describing an image is one of hundreds of things you can do in the same chat, with the same files and the same team.
Describe, then generate
Send the prompt straight to Flux, Nano Banana, GPT Image or Seedream in the same conversation and compare the results.
Every vision model
GPT-5, Claude, Gemini Pro and more read your images. Pick the one that catches the details you care about.
Your images stay yours
Uploads are used only to produce your result. Inside Krater everything you create is stored in your own workspace.
Prompts your team can reuse
Save prompts, share chats and keep a brand prompt library with Keep, so results stay consistent across the team.
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Image to prompt FAQ
What is an image to prompt generator?
A tool that looks at an image and writes the text prompt that would produce it: subject, style, lighting, color, camera and composition. You can paste the prompt into any AI image generator to recreate the look, or use it as a description.
How do I turn an image into a prompt for free?
Upload the image at the top of this page, choose detailed, short or keywords, and click Generate prompt. The prompt appears in seconds with a copy button. One run is free with no account.
Does the prompt work with any image generator?
Yes. The output is plain descriptive text, which every generator accepts. The detailed style suits photoreal models, keywords suit tag driven tools, and short prompts are a good base for editing.
Will it recreate the exact image?
No generator reproduces a photo pixel for pixel from text alone. The prompt captures the style, subject and composition closely enough to recreate the look, and inside Krater you can also use the original as a reference image for an even closer match.
Which AI model reads the image?
The free run uses Gemini Flash, a fast and accurate vision model. Inside Krater you can use GPT-5, Claude, Gemini Pro and more, then generate from the prompt with Flux, Nano Banana, GPT Image or Seedream.
Can I use it for alt text or product descriptions?
Yes. The short prompt style is a clear, specific description of what is in the image, which works well as alt text and as a starting point for catalog copy.
What file types and sizes are supported?
PNG, JPG and WebP up to 12 MB. Large images are resized in your browser before analysis, so upload speed stays fast.
Do I need an account?
No. The free run is verified automatically with no sign-up. Get Started on Krater when you want more runs, every vision model and generation in the same chat.
What happens to my image?
Your upload is used only to produce your prompt and is not used to train models. Inside Krater everything you create is stored in your own workspace under your control.
Can it describe illustrations, logos and screenshots?
Yes. It describes any picture: photos, renders, illustrations, UI screenshots and designs. For logos and typography it names the shapes, colors and style rather than guessing the exact font.
Describe any image, then generate with every model
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