Leonardo AI API - Image Generation, Upscaling & Custom Models

Generate stunning AI images with Leonardo AI. Create images from text prompts, upscale existing images, generate variations, and use custom-trained models. Perfect for content creation, marketing, game assets, and creative automation.

BYOK (Bring Your Own Key) -- you provide your own API credentials.

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Before You Start

This actor requires your own API credentials to fetch real data.

Where to get your key: Your Leonardo AI API key (from app.leonardo.ai/api-access)

You can test with Demo Mode first (free, no key needed) to see the output format before committing.

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Quick Start

Test with Demo Mode (free, no API key needed)

{
  "demoMode": true
}

Run with real data

{
  "demoMode": false,
  "task": "generate_image",
  "width": 1024,
  "height": 1024,
  "numImages": 1,
  "guidanceScale": 7,
  "public": false,
  "alchemy": false,
  "photoReal": false,
  "upscaleMultiplier": 2,
  "apiKey": "YOUR_API_KEY_HERE"
}

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Input Parameters

Parameter	Type	Default	Required	Description
task	string	"generate_image"	Yes*	The operation to perform with Leonardo AI
prompt	string	-	No	Text description of the image to generate
negativePrompt	string	-	No	What to avoid in the generated image
modelId	string	-	No	Leonardo AI model ID to use for generation
presetStyle	string	-	No	Preset style to apply
width	integer	1024	No	Image width in pixels (must be divisible by 8)
height	integer	1024	No	Image height in pixels (must be divisible by 8)
numImages	integer	1	No	Number of images to generate (1-8)
guidanceScale	number	7	No	How closely to follow the prompt (1-20, higher = more literal)
seed	integer	-	No	Random seed for reproducible results
public	boolean	false	No	Make generation publicly visible
alchemy	boolean	false	No	Enable Alchemy for higher quality output
photoReal	boolean	false	No	Enable PhotoReal for photorealistic images
generationId	string	-	No	Generation ID for get_generation, upscale, or variations
imageId	string	-	No	Image ID for upscale or variation operations
upscaleMultiplier	number	2	No	Upscale factor (1.5 or 2)
apiKey	string	-	Yes*	Your Leonardo AI API key (from app.leonardo.ai/api-access)
webhookUrl	string	-	No	URL to receive results via webhook for automation platforms
demoMode	boolean	true	No	Run with sample data for testing (no API calls made)

*Required when Demo Mode is off.

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Pricing

This actor uses pay-per-event billing:

Event	Description	Price
Image Generated	Each image generated via Leonardo AI	$0.02

Demo mode is free -- no charges for sample data.

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Troubleshooting

"API key is required"

You have Demo Mode turned off but didn't provide an API key. Either:

• Turn Demo Mode on to test with sample data
• Add your API key in the input

"API error 403" or "Unauthorized"

Your API key is invalid, expired, or doesn't have access to this specific API endpoint. Double-check your key and account permissions.

"API error 429" or "Rate limit"

Too many requests. Wait a minute and try again, or reduce the number of items per run.

No results or empty dataset

Check the run log for error messages. Common causes:

• Invalid input format (check the examples above)
• API key without proper permissions
• The target data doesn't exist or is too small to track

How do I test without an API key?

Enable Demo Mode in the input. This returns realistic sample data so you can verify the output format works for your workflow.

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Built by John Rippy | Actor Arsenal