AI Alt Text Generator API

Overview

The AltTextLab Developer API gives you full programmatic access to our alt text generation engine. Whether you're building a custom CMS, uploading images from mobile apps, or managing enterprise-scale content, you can generate descriptive, accessible, and SEO-friendly alt text with a single API call. Designed for developers, built for scale.

Features

Simple REST API
Send an image URL or base64 string — get AI-generated alt text in seconds.

Flexible Output
Choose your output language, writing style, and format. Add keywords or disable fallback logic.

Multi-language Support
Generate alt text in 130+ languages — great for localization and international platforms.

Fast & Scalable
Built to handle everything from one-off requests to high-volume, automated pipelines.

Context-Aware AI
Generate smart, human-like alt text that adapts to the type of image and use case.

Get Started

Sign up at alttextlab.com, generate an API key, and follow the quickstart guide to send your first request in minutes.

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