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AI Image Caption Generator
Generate descriptive captions for any image using AI — perfect for alt text, social media, and accessibility. Free, private, no signup.
🔒 Runs 100% in your browser — image never uploaded
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Drop your image here
or click to select · JPG, PNG, WebP, GIF
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Accessibility
Generate alt text for WCAG compliance
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Social Media
Ready-made captions for posts
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100% Private
AI runs in your browser, not our servers
Frequently Asked Questions
How does the AI caption generator work?▼
It uses the ViT-GPT2 model (Xenova/vit-gpt2-image-captioning) running in your browser via WebAssembly. A Vision Transformer encodes the image into features, and a GPT-2 decoder generates a natural-language description.
Why are three captions generated?▼
Running inference multiple times with slightly different settings produces varied captions, giving you options to choose the one that best fits your needs for alt text, social posts, or accessibility descriptions.
Is my image uploaded anywhere?▼
No — everything happens in your browser. The model runs locally via WebAssembly and your images never leave your device.
What are the best use cases for AI captions?▼
Generating alt text for web accessibility, writing social media captions, describing images for screen readers, bulk captioning for content libraries, and creating image descriptions for documents or presentations.