Image to Prompt
Drop an image in. Get a prompt you can paste straight into Midjourney, Stable Diffusion, Flux or DALL·E. This image prompt generator measures the picture in your own browser, so there is nothing to upload.
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JPG · PNG · WEBP · GIF
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Read from your image
Six frames, and the line each one produces
These six are part of the forty files this tool was measured on. Each card names the target model and the length, prints the numbers the tool read off that frame, and shows the line it wrote. Every figure is the 192×192 grid one — the same measure the rest of this site quotes. The swatch is not the photo; it is the palette the tool reported.
Colour at the top of the scale
meanL 84.56 · stdL 55.52 · edge 3.71 · meanSat 0.969 · monoRatio 0
A widescreen 16:9 image. Moderate, slightly dim lighting. The dominant colours are navy, blue, cyan, white. Vivid, saturated colour, cool blue colour temperature. Clean and minimal, smooth surfaces.
The sharpest edges in the set
meanL 158.68 · stdL 52.23 · edge 65.84 · meanSat 0 · monoRatio 1
black and white photograph, widescreen 16:9 composition, dominant palette of silver, grey, slate, charcoal, well-lit, balanced exposure, monochrome, black and white, neutral colour temperature --ar 16:9
The darkest frame measured
meanL 34.51 · stdL 46.93 · edge 22.5 · meanSat 0.762 · monoRatio 0.012
A widescreen 16:9 image, dark, low-key lighting, with a palette of navy, grey, slate, silver. Vivid, saturated colour, cool blue colour temperature, highly detailed with intricate texture.
The widest tonal spread
meanL 151.96 · stdL 89.04 · edge 11.01 · meanSat 0.215 · monoRatio 0.389
masterpiece, best quality, widescreen 16:9 composition, well-lit, balanced exposure, dominant palette of white, charcoal, silver, grey, muted, desaturated tones, neutral colour temperature, high contrast, moderate detail and texture, evenly lit, brighter upper half, moody and dramatic atmosphere
A screenshot, not a photograph
meanL 35.95 · stdL 13.68 · edge 5.14 · meanSat 0.252 · monoRatio 0.022
widescreen 16:9 composition, dark, low-key lighting, dominant palette of charcoal, forest green, slate, grey, moderately saturated colour, slightly cool tone, soft, low contrast, clean and minimal, smooth surfaces, evenly lit, moody and dramatic atmosphere --ar 16:9
The brightest frame in the set
meanL 197.54 · stdL 38.42 · edge 10.08 · meanSat 0.242 · monoRatio 0.248
A widescreen 16:9 image. Bright, high-key lighting. The dominant colours are silver, cream, steel blue, sky blue.
Twenty measured examples, with the shape each was written for, are collected on image prompt examples. Every one of the 480 lines behind them is in the output CSV.
How this image to prompt generator works
- Add your image. Drop a file onto the box, paste it from your clipboard, or click to pick one from your device.
- Choose your target model. Midjourney, Stable Diffusion, Flux and DALL·E each like prompts written a different way, so the output is formatted for the one you pick.
- Copy and paste. Take the prompt straight into your image generator. Change a word or two if you want to steer it somewhere else.
Everything happens inside your own browser tab. The image is read with the HTML canvas, measured, and thrown away when you close the page. Nothing is uploaded, nothing is stored, nobody counts how many times you pressed the button. Most image prompt AI tools do that measuring on a server, which is why they come with an account and a quota; doing it on your own device is why this one has neither.
Going the other way — writing a description and having a model draw it — has its own set of variables. See how prompt to image actually works.
Two pieces go further than this box can show. How to generate a prompt from an image, in five steps and the order that matters times each stage of the pipeline on real files and shows what cropping and brightness do to the wording. What an AI image describer actually writes, slot by slot lists the fixed vocabulary the output is built from and where each phrase flips.
What it reads, and what it doesn't
This tool measures your image and writes the prompt from those measurements. It is honest about the difference, which is why you can see every value it pulled in the Read from your image panel.
Measured directly from the pixels
- Dominant colour palette, with the five most common colours named
- Exposure — whether the frame is bright and high-key or dark and low-key
- Contrast range and colour temperature
- Detail density, from how often brightness changes across the frame
- Saturation, and whether the image is close to monochrome
- Framing, from the real width and height of your file
Inferred from those measurements
- Whether the frame is green-dominant (foliage) or blue-dominant (sky or water)
- Whether the lighting reads as soft, even, or directional
- Whether the composition has a vignette or is lit evenly
The scene hint is shown on its own line in the panel above and tagged (inferred) or (measured), so you always know which lines came from a hard number and which came from a guess. The tool does not detect people, faces, objects or brands — it will never claim your photo contains something it cannot actually measure.
The twelve signals, the cut-offs, and what the test images measure
Every phrase in a generated prompt is one of twelve measured numbers compared against a fixed cut-off. Below are the cut-offs as they stand in /script.js, beside what the three test images this site keeps in rotation measure on the 192×192 grid. The Read from your image panel prints the same fields for your own file.
| Signal | Field | Cut-offs in the code | night-fireworks 640×360 | strong-backlight 640×360 | text-screenshot 800×450 |
|---|---|---|---|---|---|
| Framing and aspect ratio | ar, arParam | >= 2.2 / 1.7 / 1.4 / 1.15 / 0.9 / 0.7 / 0.55 | 1.78 → 16:9 | 1.78 → 16:9 | 1.78 → 16:9 |
| Exposure | meanL | > 175 / 130 / 80 | 34.51 | 73.95 | 35.95 |
| Contrast | stdL | > 68 / 38 | 46.93 | 80.36 | 13.68 |
| Saturation | meanSat | monoRatio > 0.85, else meanSat > 0.45 / 0.22 | 0.7618 | 0.4990 | 0.2517 |
| Monochrome share | monoRatio | > 0.85 | 0.0117 | 0.2016 | 0.0222 |
| Colour temperature | meanR − meanB | > 14 / 5, < −5 / −14 | −43.93 | 12.38 | −9.90 |
| Detail density | edge | > 15 / 7 | 22.50 | 13.02 | 5.14 |
| Lighting distribution | centreL / borderL | either way × 1.18 | 60.25 / 29.58 | 54.14 / 77.75 | 37.54 / 35.64 |
| Vertical lighting | topL / bottomL | either way × 1.2 | 43.23 / 25.50 | 135.77 / 19.39 | 35.98 / 34.30 |
| Dominant colour palette | palette[] | 12-bit buckets merged at distance 52; top 5 named from 35, 4 reach the prompt | navy 74.4%, grey 8.7%, slate 8.3%, silver 3.5% | black 57.6%, charcoal 12.7%, silver 11.8%, white 8.3% | charcoal 91.9%, forest green 7.0%, slate 1.1%, grey 0.0% |
| Green or blue dominance | greenRatio / blueRatio | > 0.45 | 0.0013 / 0.8640 | 0.0670 / 0.1011 | 0.0530 / 0.9250 |
| Mood | mood | meanL > 150 with dt > 5; else meanL < 95 or stdL > 68; else dt < −5; else balanced | moody and dramatic | moody and dramatic | moody and dramatic |
All twelve are arithmetic over the pixel buffer, and every cut-off is a plain > comparison except framing, which uses >=. Each row, where its wording flips, and the range a phrase guarantees are set out on what an image to prompt tool actually measures; what the 192×192 grid keeps and drops before any of this runs is on where your image goes.
Supported formats
JPG and JPEG, PNG, WEBP and GIF are supported, along with any other image format your browser can decode and draw to a canvas. On Safari and iOS that includes HEIC. We do not impose a file size cap — the only ceiling is your own device's memory.
Frequently asked questions
What is an image to prompt generator?
It is a tool that takes a picture and writes the text description you would otherwise have to type yourself, so you can feed that description into an AI image generator. People also call it a photo to prompt converter, a picture to prompt tool, or simply converting an image to text prompt form. If you have a reference image and want something in the same vein, this saves you writing the paragraph by hand.
Is an AI photo prompt generator the same as a text to image tool?
No, the two run in opposite directions. An AI photo prompt generator starts with a picture and hands you back words; a text to image tool starts with your words and hands you back a picture. This page is the first kind. An AI image prompt generator is still worth having if you already use a text to image tool, because the slow part is usually describing the reference image you have in mind, not pressing generate.
Is this image to prompt tool free?
Yes. There is no free tier and paid tier, there is just free. No daily credit, no quota, no counter anywhere on the page.
Do I need to sign up or log in?
No. There is no account system to sign up for. Open the page and use it.
Is my image uploaded anywhere?
No. The file is read inside your browser tab using the canvas element, and the measurements are computed locally. Your image never travels to a server, because there is no server involved. Close the tab and it is gone.
Which models can I write prompts for?
Midjourney, Stable Diffusion, Flux and DALL·E. The wording and formatting change between them, because they respond to different styles of prompt — Midjourney gets aspect-ratio parameters appended, Stable Diffusion gets comma-separated tags, while Flux and DALL·E get natural language sentences.
Why does the prompt describe colours and lighting instead of naming what is in the picture?
Because naming objects accurately needs a vision model running on a server, and that would mean uploading your image and paying for someone else's API. This page deliberately does not do that. Instead it measures your image properly and writes the prompt from real numbers, so the colour, light and composition of what you generate will genuinely match your reference. It stays quiet about the subject rather than guessing and getting it wrong — add your own subject noun at the front of the prompt and the rest of it will still hold up. If you want automatic subject recognition, that is a different build.
Can I use it on my phone?
Yes. The page is built for small screens — the drop area is a large tap target, picking from your camera roll works normally, and the prompt box scrolls instead of spilling off the screen.
Can I edit the prompt before using it?
Yes, and you probably should. Treat the output as a strong first draft: paste it into your generator, then swap a colour or push the lighting somewhere else.
Who runs this site, and why you can check it
VisualToPrompt is built and maintained by Beixiangdexing, one independent developer. There is no company behind it and no team — the tool, the guides and the answers on this page are written by the same person who reads the contact inbox.
You do not have to take that on trust. Every number the prompt is built from is printed in the Read from your image panel before you copy anything, and your image is read inside the browser tab itself — nothing is uploaded, so there is no server holding your file. The about page sets out what this site does and does not claim to do.