SEO Playbook

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.

Updated Aug 2025 • 5 min read

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.

Bad Example
IMG_3349.PNG
Good Example
dashboard-ui-darkmode-2025.png

Workflow with AI Image Describer

  1. 1

    Upload

    Drag or select any JPG, PNG, GIF, or PDF. Uploads are processed securely by GPT-4o Vision.

  2. 2

    Generate Copy

    Click "Generate". You receive a long description, concise alt text, and caption tailored for accessibility.

  3. 3

    Publish

    Update Shopify, Webflow, or WordPress with the generated text. Signed-in users can review logs later.

Real-World Examples

Asset TypeRecommended Alt TextCaption 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  • Quarterly audits: Filter logs for outdated descriptions and refresh them in bulk.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)
Image Alt Text SEO Best Practices (2025 Playbook) | AI Image Describer