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Overview

The Lovable build with URL allows you to programmatically create applications by passing prompts and images via URL parameters. This enables direct integration with Lovable’s app generation capabilities.

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What to use it for

You can do the following with build with URL:
  • Implement a build with Lovable button in your application or on your website.
  • Generate a link with your favourite prompt to share with friends, collegues, or post on social.
To generate a link to share you can use the link generator described below. For a simple link generation experience go to the Lovable Links tool. You write your prompt and upload images. The Lovable Link tool returns a URL you can share to generate an application with the same prompt and images.

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Base URL

https://lovable.dev/?autosubmit=true#
autosubmit (boolean): Must be set to true to automatically process the request

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URL with Parameters

https://lovable.dev/?autosubmit=true#prompt=YOUR_PROMPT_HERE&images=IMAGE_URL_1&images=IMAGE_URL_2

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Parameters

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Required Parameters

  • prompt (string): Description of the application you want to build

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Optional Parameters

  • images (string): URL-encoded image URLs to include as references (can be specified multiple times)

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Example Usage

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Basic App Generation

https://lovable.dev/?autosubmit=true#prompt=Create%20a%20todo%20app

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With Reference Images

https://lovable.dev/?autosubmit=true#prompt=Display%20these%20images&images=https://img.com/1.jpg

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Multiple Images

https://lovable.dev/?autosubmit=true#prompt=Display%20these%20images&images=https://img.com/1.jpg&images=https://img.com/2.jpg​

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Limitations

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Image Requirements

  • Images must be publicly accessible URLs. 
  • You can attach a maximum of 10 images. 
  • Prompt cannot be longer than 50k characters. Very long URLs might break. 
  • Supported formats: Common web image formats (JPEG, PNG, and WebP)

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Authentication

  • If user is already logged in: Project creates immediately
  • If user is not logged in: Redirected to signup, then autosubmit triggers after authentication. Parameters are preserved through the entire signup/login flow

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Best Practices

  1. Keep prompts concise: Focus on core functionality and key features
  2. Use descriptive language: Clear descriptions yield better results
  3. Include reference images: Visual examples help guide the generation process
  4. Test URL encoding: Ensure special characters in URLs are properly encoded

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Error Handling

If the URL is malformed or exceeds length limits, you may encounter:
  • Browser “URL too long” errors
  • Incomplete parameter parsing
  • Failed autosubmission