Alt Text API
Generate Alt Text for Any Image.
Programmatically.
Send a single POST request with an image URL and receive SEO-aware, accessibility-friendly alt text in JSON. Built for developers, agencies, and automation teams.
Features
Everything You Need for API-Driven Alt Text
Designed for scalable image pipelines and direct CMS integrations.
Image URL In, Alt Text Out
Pass any publicly accessible image URL and get SEO-aware alt text in one API call.
200+ Languages
Generate multilingual alt text using BCP 47 language codes for global websites and storefronts.
Keyword Injection
Add seo_keywords to naturally include target terms without stuffing.
Reliable Model Fallback
Built-in fallback keeps generation stable for production workflows.
Production-Friendly Limits
Predictable request limits and fast response times for queue, webhook, and batch pipelines.
Accessibility at Scale
Create WCAG-friendly alt text across large media libraries without manual writing.
How It Works
From API Key to Live Automation in 4 Steps
Keep implementation simple while staying flexible for advanced workflows.
Get API Key
Create an Alt Magic account and copy your API key from the dashboard.
Send POST Request
Call the endpoint with image_url and optional fields like seo_keywords.
Receive JSON Output
Parse altText and usage fields from the response body.
Automate Everywhere
Use in scripts, job queues, CMS workers, Make.com scenarios, or webhooks.
Quick Reference
Core Request Parameters
A quick implementation reference. Use docs for complete request/response and edge-case coverage.
| Parameter | Type | Required | Description |
|---|---|---|---|
| image_url | String | Yes | Public image URL to analyze |
| user_id | String | Yes | Your account email / user identifier |
| seo_keywords | String | No | Optional SEO terms to blend into output |
| language_code | String | No | BCP 47 language code, default 'en' |
Typical response fields
Comparison
How Alt Magic compares to AltText.ai and ChatGPT.
A quick overview of how each option performs on the things that matter when you're generating SEO-friendly alt text at scale.
AltText.ai
Pricing Value
⭐ Higher cost per credit
WordPress Integration
✅ Standard plugin
Credit System
Double credits for some formats
Quality
⭐⭐⭐⭐ Equal AI quality
Customer Support
Standard support
Languages Supported
130+ languages
Bulk Processing
✅ Automated bulk
SEO Optimization
✅ Keyword-rich
Workflow Integration
✅ Seamless CMS
Smart Image Renaming
❌ Not available
ChatGPT
Pricing Value
$20/month for limited messages
WordPress Integration
❌ No integration
Credit System
No credit system
Quality
Good but inconsistent
Customer Support
Community forums only
Languages Supported
100+ languages
Bulk Processing
❌ Manual one-by-one
SEO Optimization
Requires manual prompting
Workflow Integration
❌ Breaks workflow
Smart Image Renaming
❌ Not available
Alt Magic
Best value⭐⭐⭐⭐⭐ 3.75x more credits
Pricing Value
✅ Deep WordPress focus
WordPress Integration
All formats = 1 credit
Credit System
⭐⭐⭐⭐ Equal AI quality
Quality
On-call + FB community
Customer Support
150+ languages
Languages Supported
✅ Automated bulk
Bulk Processing
✅ Keyword-rich
SEO Optimization
✅ Seamless CMS
Workflow Integration
✅ Automatic SEO-friendly renaming
Smart Image Renaming
Pricing Value
AltText.ai
⭐ Higher cost per credit
ChatGPT
$20/month for limited messages
Alt Magic
⭐⭐⭐⭐⭐ 3.75x more credits
WordPress Integration
AltText.ai
✅ Standard plugin
ChatGPT
❌ No integration
Alt Magic
✅ Deep WordPress focus
Credit System
AltText.ai
Double credits for some formats
ChatGPT
No credit system
Alt Magic
All formats = 1 credit
Quality
AltText.ai
⭐⭐⭐⭐ Equal AI quality
ChatGPT
Good but inconsistent
Alt Magic
⭐⭐⭐⭐ Equal AI quality
Customer Support
AltText.ai
Standard support
ChatGPT
Community forums only
Alt Magic
On-call + FB community
Languages Supported
AltText.ai
130+ languages
ChatGPT
100+ languages
Alt Magic
150+ languages
Bulk Processing
AltText.ai
✅ Automated bulk
ChatGPT
❌ Manual one-by-one
Alt Magic
✅ Automated bulk
SEO Optimization
AltText.ai
✅ Keyword-rich
ChatGPT
Requires manual prompting
Alt Magic
✅ Keyword-rich
Workflow Integration
AltText.ai
✅ Seamless CMS
ChatGPT
❌ Breaks workflow
Alt Magic
✅ Seamless CMS
Smart Image Renaming
AltText.ai
❌ Not available
ChatGPT
❌ Not available
Alt Magic
✅ Automatic SEO-friendly renaming
Testimonials
What our community is saying
“I wish more people know about this tool. If you want to automatically process on your Alt Text Images with on-point details, Alt Magic is the answer. Tool is easy to use even if you're a beginner. Am happy to found this tool and more importantly, the founder Advait is friendly and responsive.”
“AltMagic takes the mind-numbing task of writing alt text and makes it effortless. Its AI descriptions are impressively accurate, vivid, and way better than the half-baked guesses I used to slap on my images. It even handled a giant mess of filenames like IMG_3492_FINAL_USE_THIS_ONE.jpg with ease.”
“What I love most is how much time it saves me. I don't have to sit there writing descriptions for every single image — Alt Magic just gets it. The descriptions actually make sense, feel natural, and help with accessibility and SEO at the same time.”
“Alt Magic saved me so much time by automatically generating alt text for all my images. The AI descriptions are accurate and make my site more accessible. Setup was easy and it works great so far. Totally recommend it!”
“The most helpful about using this simple plugin is that you can simply do a bulk update of any missing alt attributes that you are missing. It actually will give you a description something more than maybe what your file name is when it's letters and numbers.”
“Plugin is easy to handle, can bulk generate images alt descriptions (for images that don't have any) and also generate them as you upload new images.”
“I've been using altmagic.pro for about a month now, and I'm genuinely impressed with the results. One of the most noticeable improvements has been a significant increase in my website traffic. The plugin works seamlessly in the background — lightweight, fast, and integrates effortlessly with my existing setup.”
“I wish more people know about this tool. If you want to automatically process on your Alt Text Images with on-point details, Alt Magic is the answer. Tool is easy to use even if you're a beginner. Am happy to found this tool and more importantly, the founder Advait is friendly and responsive.”
“AltMagic takes the mind-numbing task of writing alt text and makes it effortless. Its AI descriptions are impressively accurate, vivid, and way better than the half-baked guesses I used to slap on my images. It even handled a giant mess of filenames like IMG_3492_FINAL_USE_THIS_ONE.jpg with ease.”
“What I love most is how much time it saves me. I don't have to sit there writing descriptions for every single image — Alt Magic just gets it. The descriptions actually make sense, feel natural, and help with accessibility and SEO at the same time.”
“Alt Magic saved me so much time by automatically generating alt text for all my images. The AI descriptions are accurate and make my site more accessible. Setup was easy and it works great so far. Totally recommend it!”
“The most helpful about using this simple plugin is that you can simply do a bulk update of any missing alt attributes that you are missing. It actually will give you a description something more than maybe what your file name is when it's letters and numbers.”
“Plugin is easy to handle, can bulk generate images alt descriptions (for images that don't have any) and also generate them as you upload new images.”
“I've been using altmagic.pro for about a month now, and I'm genuinely impressed with the results. One of the most noticeable improvements has been a significant increase in my website traffic. The plugin works seamlessly in the background — lightweight, fast, and integrates effortlessly with my existing setup.”
“I've been using altmagic.pro for about a month now, and I'm genuinely impressed with the results. One of the most noticeable improvements has been a significant increase in my website traffic. The plugin works seamlessly in the background — lightweight, fast, and integrates effortlessly with my existing setup.”
“Plugin is easy to handle, can bulk generate images alt descriptions (for images that don't have any) and also generate them as you upload new images.”
“The most helpful about using this simple plugin is that you can simply do a bulk update of any missing alt attributes that you are missing. It actually will give you a description something more than maybe what your file name is when it's letters and numbers.”
“Alt Magic saved me so much time by automatically generating alt text for all my images. The AI descriptions are accurate and make my site more accessible. Setup was easy and it works great so far. Totally recommend it!”
“What I love most is how much time it saves me. I don't have to sit there writing descriptions for every single image — Alt Magic just gets it. The descriptions actually make sense, feel natural, and help with accessibility and SEO at the same time.”
“AltMagic takes the mind-numbing task of writing alt text and makes it effortless. Its AI descriptions are impressively accurate, vivid, and way better than the half-baked guesses I used to slap on my images. It even handled a giant mess of filenames like IMG_3492_FINAL_USE_THIS_ONE.jpg with ease.”
“I wish more people know about this tool. If you want to automatically process on your Alt Text Images with on-point details, Alt Magic is the answer. Tool is easy to use even if you're a beginner. Am happy to found this tool and more importantly, the founder Advait is friendly and responsive.”
“I've been using altmagic.pro for about a month now, and I'm genuinely impressed with the results. One of the most noticeable improvements has been a significant increase in my website traffic. The plugin works seamlessly in the background — lightweight, fast, and integrates effortlessly with my existing setup.”
“Plugin is easy to handle, can bulk generate images alt descriptions (for images that don't have any) and also generate them as you upload new images.”
“The most helpful about using this simple plugin is that you can simply do a bulk update of any missing alt attributes that you are missing. It actually will give you a description something more than maybe what your file name is when it's letters and numbers.”
“Alt Magic saved me so much time by automatically generating alt text for all my images. The AI descriptions are accurate and make my site more accessible. Setup was easy and it works great so far. Totally recommend it!”
“What I love most is how much time it saves me. I don't have to sit there writing descriptions for every single image — Alt Magic just gets it. The descriptions actually make sense, feel natural, and help with accessibility and SEO at the same time.”
“AltMagic takes the mind-numbing task of writing alt text and makes it effortless. Its AI descriptions are impressively accurate, vivid, and way better than the half-baked guesses I used to slap on my images. It even handled a giant mess of filenames like IMG_3492_FINAL_USE_THIS_ONE.jpg with ease.”
“I wish more people know about this tool. If you want to automatically process on your Alt Text Images with on-point details, Alt Magic is the answer. Tool is easy to use even if you're a beginner. Am happy to found this tool and more importantly, the founder Advait is friendly and responsive.”
FAQ
Frequently asked questions
Everything you need to know about the Alt Text API