Free
Alt Text Generator
Generate accessible alt text for images with vision AI.
Vision LLM captionsAccessibility-focusedFree tier
Frequently asked questions
Why is alt text important?
Alt text improves accessibility for screen readers and can boost SEO for image-heavy pages.
Built with Pixeltable
Run this as tables and an API on Pixeltable Cloud.
Fact sheet
Last updated
| Modality | Image |
|---|---|
| Inputs | Image plus an instruction |
| Outputs | Model text about the image |
| Computed column | gemini.generate_content on the image and the prompt |
| What updates | A new or changed row recomputes only that row. Unchanged rows stay cached. |
| Canonical doc | gemini.generate_content |
Runnable sample
import pixeltable as pxt
from pixeltable.functions.gemini import generate_content
TableModel = pxt.model_base()
class Ocr(TableModel, name='ocr'):
source_image: pxt.Image
prompt: pxt.String
vision_response = generate_content(
contents=[source_image, prompt],
model='gemini-2.5-flash',
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Docs