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The Letter Generator API enables you to programmatically generate professional letters using artificial intelligence. Create cover letters, recommendation letters, formal correspondence, and 25+ other letter types with customizable tones and multilingual support.

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Base URL

All API requests should be made to: 
https://api.lettergenerator.co/v1

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Key features

The Letter Generator API provides:
  • 25+ letter types - Generate cover letters, recommendation letters, resignation letters, love letters, and more
  • 17 customizable tones - Choose from professional, friendly, persuasive, romantic, formal, casual, and other styles
  • AI-powered generation - Instant letter creation using advanced language models
  • Multilingual support - Generate letters in multiple languages for global communication
  • High availability - Reliable API with 99.9% uptime SLA
  • Fast response times - Typical generation completes in under 3 seconds

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Getting started

To start using the API:
  1. Sign up for an account at lettergenerator.co
  2. Navigate to your dashboard and generate an API key
  3. Authenticate your requests using your API key
  4. Make your first letter generation request

Authentication

Learn how to authenticate your API requests

Generate letter

Create AI-powered letters with the generation endpoint

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Rate limits

API rate limits vary by plan:
  • Free tier: 10 requests per day
  • Basic plan: 100 requests per day
  • Pro plan: 1,000 requests per day
  • Enterprise plan: Custom limits available
Rate limit information is included in response headers: 
X-RateLimit-Limit: 100
X-RateLimit-Remaining: 87
X-RateLimit-Reset: 1709510400

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Support

Need help with the API? Contact our support team:

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