How to create Image Alt Text for SEO
Search engines expect every visual to include thoughtful descriptions. Here is your complete playbook for boosting long-tail visibility with GPT-4o Vision.
Whether you’re shipping a new UI screen, uploading lifestyle photography, or digitizing paperwork, descriptive text helps Google, Bing, and Pinterest understand your content while keeping you compliant with WCAG.
What Algorithms Look For
👁️ Clarity
Describe the primary subject and action clearly.
Ex: "Analytics dashboard highlighting MRR trends"
🧠 Context
Mention why the image exists on the page.
Ex: "Hero banner for lifetime plan"
📏 Conciseness
Keep alt attributes under 125 characters. Push extended details into a long-description field or caption.
🔑 Keywords
Include focus terms naturally once. Do not stuff keywords.
Ex: "ai image describer workflow"
File Naming Conventions
Search engines inspect filenames too. Don't waste this ranking opportunity.
IMG_3349.PNGdashboard-ui-darkmode-2025.pngWorkflow with AI Image Describer
- 1
Upload
Drag or select any JPG, PNG, GIF, or PDF. Uploads are processed securely by GPT-4o Vision.
- 2
Generate Copy
Click "Generate". You receive a long description, concise alt text, and caption tailored for accessibility.
- 3
Publish
Update Shopify, Webflow, or WordPress with the generated text. Signed-in users can review logs later.
Real-World Examples
| Asset Type | Recommended Alt Text | Caption Idea |
|---|---|---|
| Pricing Banner | “Hero banner promoting lifetime plan for AI Image Describer” | “Upgrade now and add more credits.” |
| Mobile UI | “Screenshot of mobile editor showing dark mode controls” | “Edit alt text on the go.” |
| Lifestyle Photo | “Creator using a laptop to convert screenshot to text near a window” | “Convert images to copy in seconds.” |
Advanced Tips
- ▸Plan localized copy: Let us know which languages you need for upcoming multilingual prompts.
- ▸Use Schema: Use ImageObject structured data to reinforce the description.
- ▸Quarterly audits: Filter logs for outdated descriptions and refresh them in bulk.
Ready to make your site accessible and SEO-friendly?
Generate Alt Text Now (Free)