Image Alt Text Generator
Upload an image and get 3 SEO-friendly alt text suggestions powered by Gemini Vision AI. 100% free.
🖼️
Drop an image here or click to upload
JPEG, PNG, WebP, GIF — max 4 MB
Why Image Alt Text Generator Matters
Image alt text is one of the most commonly skipped SEO tasks — and one of the easiest wins. It helps search engines understand visual content, improves accessibility for screen reader users, and can drive additional traffic through Google Image Search when written correctly.
Image Search Traffic
Descriptive alt text makes your images indexable in Google Image Search — a source of high-intent traffic most sites completely ignore.
Accessibility & Core Web Vitals
Missing alt attributes fail WCAG accessibility standards and can negatively affect Core Web Vitals scores that influence your rankings.
- Decorative images should use empty alt text (alt="") — never skip the attribute entirely.
- Include one relevant keyword naturally in alt text, but never stuff multiple keywords.
- Describe what the image shows, not what you want it to rank for — specificity wins.
How to use Image Alt Text Generator
Upload Your Image
Drag and drop or click to upload a JPEG, PNG, WebP, or GIF under 4 MB. The image is analysed locally and never stored.
Analyse with Gemini Vision
Click Generate Alt Text to send the image to Gemini Vision AI. Results appear in seconds — no signup or API key required.
Review 3 Suggestions
The tool returns 3 distinct alt text options at varying levels of specificity. Each includes a character count to guide your choice.
Copy & Apply
Copy the best option and paste it into your CMS image alt field. Aim for 5-15 words that describe the image accurately and include a keyword.
Why Fonzy SEO Tools?
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Image SEO Audit & Alt Text Workflow
Run this process to systematically fix missing alt text across your site and capture the image search traffic your competitors are ignoring.
Recommended implementation sequence
SEO Workflow Map
Audit Missing Alt Text
Use Google Search Console's Page Experience report or a crawler like Screaming Frog to identify all images with missing or empty alt attributes.
Prioritise by Page Value
Start with product pages, blog posts, and landing pages that already rank — adding alt text to existing traffic gives the fastest ROI.
Generate & Apply in Batches
Process images in batches using this tool. Focus on main content images first; decorative images and icons can use empty alt text.
Monitor Image Search Performance
Check Google Search Console's Search type filter set to 'Image' after 30 days to measure incremental impressions and clicks.
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Roald Larsen
Founder, Fonzy
Whenever you're ready
Grow Organic Traffic on Auto-Pilot
Fonzy automatically generates and applies descriptive alt text to all images — improving rankings, accessibility, and image search visibility across every page it manages.
100% free forever for basic tools.
Frequently Asked Questions
Everything you need to know about image alt text generator.
Alt text describes an image to search engines and screen readers. Google uses alt text to understand image content and include images in image search results. It also improves accessibility.
Keep alt text concise — 5 to 15 words is ideal. Be descriptive and include your keyword naturally, but avoid keyword stuffing.
Decorative images (dividers, spacers) should have empty alt text (alt=""). All meaningful images — product photos, charts, team photos — should have descriptive alt text.
No. Duplicate alt text is treated like duplicate content. Each image on your site should have a unique alt attribute that accurately describes that specific image.
This tool uses Gemini Vision AI (Gemini Flash) to analyse your uploaded image and generate contextually accurate alt text. Results are instant and no signup is required.
Fonzy automatically generates and applies descriptive, keyword-rich alt text to every image on pages it manages, improving both SEO and accessibility without any manual effort from your team.