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    media

    Image
    Caption
    Converter

    Generate natural-language captions for images using a vision-language model. Produces concise, descriptive sentences suitable for alt text, content indexing, and accessibility compliance.

    Max file size: 50 MB
    Estimated: 1-4 sec per image
    6 input formats

    How It Works

    1

    Upload an image or provide a URL.

    2

    A vision-language model analyzes the image content.

    3

    A caption is generated describing the main subjects and actions.

    4

    The caption is returned along with a confidence score.

    5

    Multiple caption variants can be requested for A/B testing.

    Code Examples

    from mixpeek import Mixpeek
    

    client = Mixpeek(api_key="YOUR_API_KEY")
    

    result = client.convert(
        source="https://example.com/photo.jpg",
        from_format="image",
        to_format="caption",
        options={
            "style": "concise",
            "num_variants": 3
        }
    )
    

    for caption in result.captions:
        print(caption.text, caption.confidence)

    Use Cases

    Auto-generate alt text for web accessibility (WCAG compliance)
    Create captions for social media image posts
    Index product images with descriptive metadata
    Enrich image search with natural language descriptions

    Supported Input Formats

    JPEG
    PNG
    WebP
    TIFF
    BMP
    GIF

    Quick Info

    Categorymedia
    Max File Size50 MB
    Est. Time1-4 sec per image
    Extractorimage-descriptor

    Try This Conversion

    Get started with the Mixpeek API and convert your first file in minutes.

    Frequently Asked Questions

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    Ready to convert image to caption?

    Start using the Mixpeek Image to Caption in minutes. Sign up for a free API key and follow the documentation to get started.