UFOZoo

Alt Text Generator — Image Accessibility & WCAG Descriptions

Generate alt text for WCAG-compliant images. Extract metadata and colors, craft SEO-friendly descriptions. 100% browser-based — images never leave your device.

Features

  • ✓Drag-and-drop images — open any image to auto-extract metadata, dimensions, format, and colors
  • ✓AI-free color analysis — extracts dominant colors from the image using canvas pixel sampling, no server API needed
  • ✓Three output formats — generates short (minimal), standard (descriptive), and detailed (complete) alt text options
  • ✓Image type presets — choose from decorative, informative, product, screenshot, infographic, or logo for tailored descriptions
  • ✓SEO keyword integration — optionally include SEO keywords in generated alt text for better image search rankings
  • ✓WCAG compliance guidance — automatically flags decorative images for empty alt attributes and provides accessible descriptions
  • ✓One-click copy — copy any generated alt text variant to clipboard with visual confirmation
  • ✓100% browser-based — image processing and text generation happen entirely client-side, nothing is uploaded to any server
  • ✓Export all variants at once — copy short, standard, and detailed versions in one click for batch processing
  • ✓Real-time metadata extraction — dimensions, format, file size, and aspect ratio update instantly on image open

How to Use

  1. 1Open an image by dragging and dropping it onto the drop area, or click to browse and select a file.
  2. 2Review the auto-extracted metadata: image dimensions, format, file size, aspect ratio, and dominant colors.
  3. 3Select the image type (decorative, informative, product, screenshot, infographic, or logo) to tailor the generated description.
  4. 4Fill in optional context: subject description, key details, usage context, and mood to make the alt text more accurate.
  5. 5Toggle SEO keywords on or off. When enabled, your subject and filename will be included as SEO terms.
  6. 6Click Generate to produce three alt text variants (short, standard, detailed). Copy the one that fits your needs.
  7. 7Generate alt text for e-commerce products: select Product type, fill in product name, color, material, and use context for SEO-optimized descriptions that boost conversion
  8. 8Generate alt text for infographics: select Infographic type, describe the data visualization content and key takeaways for comprehensive detailed alt text
  9. 9Copy individual versions with the copy button next to each output, or use the batch copy button to grab all three at once
  10. 10Regenerate with different context: adjust the subject, details, or mood fields and click Generate again to get new alt text variants without re-opening the image

Frequently Asked Questions

What is alt text and why is it important?

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Alt text (alternative text) is a written description of an image used by screen readers and search engines. It is essential for web accessibility (WCAG 2.1 Success Criterion 1.1.1) and improves SEO by helping search engines understand image content. Without alt text, visually impaired users cannot understand what an image conveys.

How long should alt text be?

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Alt text should be concise but descriptive. Short alt text is typically under 125 characters. Standard alt text runs 125-250 characters. Detailed alt text can be longer for complex images like infographics. The key is to convey the same information a sighted user would get from the image without being overly verbose.

When should I use an empty alt attribute (alt='')?

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Use alt='' for decorative images that add no informational value — purely visual elements like borders, spacers, background patterns, or stock photos used for ambiance. Screen readers will skip these entirely. Never omit the alt attribute altogether; always include it even when empty.

Is this tool using AI to describe my images?

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No. This tool uses canvas-based color analysis to extract dominant colors from your image, and combines that metadata with your manual input (subject, details, context) to generate structured alt text. No AI model, no server API call, no data leaves your browser. You provide the semantic understanding; the tool formats it properly.

How does alt text affect SEO?

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Search engines use alt text to understand image content, which helps your images appear in Google Image Search and improves page relevance signals. Well-written alt text with relevant keywords (without keyword stuffing) can drive significant traffic through image search results. This tool includes an optional SEO keyword mode.

What image formats are supported?

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The tool supports all image formats that your browser can render: JPEG, PNG, WebP, GIF, AVIF, SVG, and BMP. The format is detected automatically from the file's MIME type. Image processing (color analysis) uses the Canvas API, so any format your browser displays can be analyzed.

Can I use this for e-commerce product images?

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Yes. The product image type preset generates alt text optimized for e-commerce: product name, key features, color/material details, and context. Good product alt text improves both accessibility and conversion rates by helping users with screen readers understand exactly what a product looks like.

Is my image uploaded to any server?

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No. Everything runs in your browser. The image is read using the FileReader API, rendered to a canvas for color analysis, and then discarded. Nothing is ever transmitted over the network. You can disconnect from the internet after the page loads and the tool will still work.

What is the difference between short, standard, and detailed alt text?

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Short (under 125 chars): single sentence identifying the image subject — ideal for simple images like logos or icons. Standard (125-250 chars): describes subject, key actions, and context — best for most web images. Detailed (250+ chars): comprehensive description including spatial relationships, text content, and data — essential for infographics, charts, and complex images. Choose the detail level that matches the image's informational value.

How do I write alt text for decorative background images?

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Select the Decorative image type and leave the subject field empty, or explicitly mark it as decorative. The tool will output an empty alt attribute (alt=""). This tells screen readers to skip the image entirely, preventing unnecessary auditory clutter. Common examples: gradient backgrounds, pattern textures, stock photos used purely for visual ambiance.

Can I generate alt text for images with text content like screenshots?

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Yes, select the Screenshot image type. For screenshots containing important text (UI labels, error messages, data tables), enter the visible text in the Key Details field. The generated detailed alt text will include both the visual description and the text content, ensuring screen reader users get the complete information.

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