Free Image Alt Text Generator
Upload any image and get 3 AI-generated, SEO-optimized alt text descriptions instantly. Improve accessibility and image search rankings — no signup required.
Click to upload
or drag and drop (Max 4MB)
JPG, PNG, WebP, GIF
Upload an image
Drop an image above to generate SEO-optimized alt text.
100% free
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Results in seconds
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Why Alt Text Matters for SEO
Alt text is the bridge between your images and search engines. Without it, search engines cannot interpret what your images contain — so they skip them entirely.
Descriptive alt text gives your images a real chance to show up in Google Images, driving incremental traffic to your site without any additional content work.
Accessibility
Screen readers rely on alt text to describe images to visually impaired users. Proper alt text is required for WCAG compliance and is the right thing to do.
Image SEO
Google Images is a major search channel in its own right. Descriptive alt text lets your images rank there and surface your content to new audiences.
- Clears the Lighthouse "images have alt attributes" audit
- Helps images rank in Google Images and Discover
- Protects against broken image fallback experiences
<img src="product.jpg" /><img src="product.jpg"
alt="Organic skincare moisturizer
with rosehip oil in amber glass" />Missing alt text flagged → fixed
Illustrative example of AI-generated alt text
How to Use the Alt Text Generator
Three steps to go from blank alt attribute to SEO-optimized description in seconds.
Upload Your Image
Drag and drop or click to upload a JPG, PNG, WebP, or GIF. Images up to 4MB are supported.
AI Analyzes the Image
Our vision AI identifies objects, text, context, and actions in your image — the same way a human would describe it.
Copy & Use
Get 3 alt text variations optimized for both accessibility and SEO. Pick the best fit and paste it into your CMS.
Who Uses This Tool
Whether you manage a blog, an online store, or a client site, every image deserves proper alt text.
Blog Authors
Auto-generate alt text for every image in your posts without slowing down your publishing workflow.
E-commerce
Descriptive product image alt text that helps your product photos surface in Google Images.
Web Developers
Quickly add accessibility-compliant alt attributes to img tags without guessing at the right description.
Social Media
Optimize image descriptions for Pinterest and image search to drive discovery traffic from visual platforms.
Frequently Asked Questions
What is image alt text?
Alt text (alternative text) is a written description of an image that appears when the image can't load and is read by screen readers. It's essential for web accessibility and helps search engines understand image content.
How does the AI generate alt text?
We use GPT-4o vision to analyze your image, identifying objects, text, people, actions, and context. The AI then generates 3 descriptive variations optimized for both SEO and accessibility.
Is my uploaded image stored?
LazySEO doesn't save your image. It is processed in memory, sent to OpenAI's API for analysis, and discarded once the alt text is returned. OpenAI's API data-retention policy applies to that request.
What makes good alt text?
Good alt text is 40-125 characters, describes the image specifically (not "image of..."), includes relevant keywords naturally, and provides context that a blind user would find helpful.
How much does it cost?
Completely free, with no signup. To keep it free for everyone, each visitor can run a limited number of images per minute.
Every Image Deserves
a Description
LazySEO automates keyword research, content creation, and publishing — so you rank on Google and AI search engines without the manual work.
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Key terms explained
Plain-English definitions from the LazySEO SEO glossary.