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Documentation Index

Fetch the complete documentation index at: https://www.alttextlab.com/docs/llms.txt

Use this file to discover all available pages before exploring further.

The AltTextLab API lets you generate alt text for images at scale — from a single request to millions of assets.

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Base URL

https://app.alttextlab.com/api/v1

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Capabilities

  • Generate alt text for any public image URL
  • 130+ output languages
  • Customizable writing styles
  • E-commerce mode with product metadata
  • Context fields to improve accuracy for ambiguous images

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Common use cases

  • Content Management Systems
  • E-commerce product catalogs
  • Blog automation and dynamic media feeds
  • No-code tools (Zapier, Make)
  • Custom pipeline integrations

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Rate limits

WindowLimit
Per second5 requests
Per minute120 requests
Per day100,000 requests
Exceeding a limit returns a rate-limit error. Limits reset automatically after their window expires.
If you need a higher request volume, contact our support team.

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Getting started

API Key

Create and manage your API keys.

Authentication

How to authenticate every request.

Alt text generation

The main endpoint — request parameters and response format.

Supported languages

Full list of 130+ language codes.