What is an image to prompt generator?

An image to prompt generator is an AI tool that analyzes any image and automatically creates a text prompt you can use in AI image generators like Midjourney, DALL-E 3, Stable Diffusion, or Flux. PromptLens is the best free image to prompt generator available online.

How do I convert an image to a Midjourney prompt?

Upload your image to PromptLens, select 'Midjourney' as your target model, and click Generate. PromptLens will analyze your image and produce an optimized Midjourney prompt in seconds — completely free.

Is this image to prompt generator free?

Yes! PromptLens is a free image to prompt generator. No login is required to get started. The free plan gives you 5 prompt generations per day across top AI models including Midjourney and DALL-E 3.

What AI models can I generate prompts for?

PromptLens supports 7 AI models: Midjourney, DALL-E 3, Stable Diffusion, Flux, General AI, and more. You can also use Compare Mode to generate prompts for multiple models simultaneously.

How does the AI image to prompt tool work?

PromptLens uses advanced vision AI to analyze your image — detecting style, composition, lighting, color palette, and subject details — then generates an optimized text prompt tailored to your chosen AI image generator.

Can I use this as a free image to prompt generator without login?

Absolutely. PromptLens is a free image to prompt generator with no login required. Just visit the site, upload your image, and generate prompts instantly. Create a free account to save your prompt history.

⚙️ ComfyUI Guide · 7 min read

How to Convert Image to Prompt for ComfyUI

ComfyUI is the most powerful node-based interface for Stable Diffusion — but creating prompts from reference images can be challenging. This guide explains how to extract a high-quality image to prompt for ComfyUI using both native nodes and faster online tools like PromptLens.

What is ComfyUI?

ComfyUI is an open-source, node-based graphical interface for running Stable Diffusion and other AI image generation models locally. Unlike A1111 (Automatic1111), ComfyUI uses a visual workflow graph where you connect nodes representing different processing steps — from loading a model checkpoint to encoding prompts, sampling latents, and decoding the final image.

This node-based approach makes ComfyUI incredibly flexible. You can build complex workflows for img2img, inpainting, ControlNet, LoRA stacking, upscaling, and more. ComfyUI supports SDXL, SD 1.5, SD 3, and increasingly, Flux models — making it the go-to tool for power users who want full control over their AI image generation pipeline.

Because ComfyUI gives you so much control, having the right prompt is especially important. A high-quality image to prompt extraction ensures that your ComfyUI workflow starts with accurate, detailed text conditioning for the best possible output.

How to Extract a Prompt from an Image for ComfyUI

There are two main approaches to converting an image to a prompt for use in ComfyUI:

Method 1: Use PromptLens (Fastest)

1
Visit promptlens.ai and upload your reference image.
2
Select 'Stable Diffusion' as your target model — this produces the comma-separated keyword format that ComfyUI handles best.
3
Click Generate and wait a few seconds for the AI analysis.
4
Copy the generated prompt and paste it into your ComfyUI CLIP Text Encode (Prompt) node.
5
Optionally, copy the negative prompt section into your Negative CLIP Text Encode node.

Method 2: CLIP Interrogator Node (Advanced)

For users who want to stay entirely within ComfyUI, you can install the WD14 Tagger or BLIP Interrogator custom nodes via ComfyUI Manager. These nodes take an image as input and output a text prompt.

WD14 Tagger: Best for anime and illustrated styles. Outputs Danbooru-style tags with confidence scores. Great for SDXL anime models.

BLIP Interrogator: Better for photorealistic images. Uses BLIP captioning combined with CLIP to generate natural language prompts with artistic style keywords appended.

Best ComfyUI Prompt Format

Understanding ComfyUI prompt format will help you get the most out of any image-to-prompt tool. Here's the recommended structure:

1. Quality boosters (front-load these)

masterpiece, best quality, ultra-detailed, 8k,

These tokens heavily influence the model's attention and should come first.

2. Subject description

1girl, long auburn hair, blue eyes, white dress,

Describe the main subject with specific attributes.

3. Setting and background

standing in a sunlit garden, cherry blossoms falling,

Set the scene and environment.

4. Lighting and atmosphere

golden hour lighting, soft shadows, warm tones,

Lighting dramatically affects output quality.

5. Style and medium

oil painting style, impressionist, detailed brushwork

Specify artistic style at the end.

PromptLens automatically structures Stable Diffusion prompts in this format when you choose it as your target model — no manual restructuring needed.

Use PromptLens to Generate ComfyUI Prompts Instantly

Stop spending time manually writing prompts. Upload any reference image to PromptLens, select Stable Diffusion, and get a fully-formatted ComfyUI-ready prompt in seconds. It's completely free — no account needed.

⚙️ Generate ComfyUI Prompt Free →

No login required · 5 free generations per day · Stable Diffusion format

Frequently Asked Questions

What is the best way to get a prompt from an image for ComfyUI?

The fastest way is to use an AI image-to-prompt tool like PromptLens. Upload your reference image, select 'Stable Diffusion' or 'General' as the target model, and copy the generated prompt directly into your ComfyUI CLIP Text Encode node. This approach takes under 30 seconds and produces prompts already formatted in the comma-separated keyword style ComfyUI handles best.

Does ComfyUI have a built-in image to prompt feature?

ComfyUI does not have a native image-to-prompt feature, but you can achieve this by installing the CLIP Interrogator custom node (WD14 Tagger or BLIP). These nodes analyze an image and generate a prompt. Alternatively, using an online tool like PromptLens is faster and requires no setup.

What prompt format does ComfyUI use?

ComfyUI (and Stable Diffusion workflows) work best with comma-separated keyword prompts that include subject descriptions, art style tags, quality boosters (like 'masterpiece, best quality'), lighting descriptors, and optional negative prompts. PromptLens generates prompts in this exact format when you select Stable Diffusion as your model.

Can I use PromptLens prompts in ComfyUI without modification?

Yes. When you generate a Stable Diffusion prompt with PromptLens, you can paste it directly into the CLIP Text Encode (Prompt) node in ComfyUI. The format is fully compatible. For best results, also add a negative prompt with common quality excluders like 'blurry, low quality, watermark, deformed'.

Related tools and guides:

← Image to Prompt Generator Image Prompt Generator Flux AI Prompt Guide →