AI Alt-Text Creator by Allan Warsing
Adds a "Create Alt Text" button to image uploads on Bluesky, Mastodon, LinkedIn, Instagram, and Facebook. Uses AI (Google Gemini, OpenAI, Anthropic, or hosted service) to generate image descriptions. API keys stored locally only.
Some features may require paymentSome features may require payment
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About this extension
Make social media accessible with AI-generated alt text. This extension adds a "Create Alt Text" button to image upload dialogs on Bluesky, Mastodon, LinkedIn, Instagram, and Facebook.
## How it works
1. Upload an image to a post
2. Open the alt text dialog
3. Click "Create Alt Text"
4. AI analyzes the image and fills in the description
## AI Providers
Choose your preferred provider:
- Google Gemini (bring your own API key)
- OpenAI GPT-4 (bring your own API key)
- Anthropic Claude (bring your own API key)
- Alt Kit Hosted ($3/month - no setup required)
## Privacy
- API keys stored locally on your device only
- Images sent directly to your chosen AI provider
- No tracking or data collection by the extension
## Features
- Automatic clipboard copy as fallback
- Works with React-based interfaces
- Lazy loading for minimal resource usage
The extension is free. You pay your AI provider directly for usage, or use our hosted plan for a flat monthly fee.
## How it works
1. Upload an image to a post
2. Open the alt text dialog
3. Click "Create Alt Text"
4. AI analyzes the image and fills in the description
## AI Providers
Choose your preferred provider:
- Google Gemini (bring your own API key)
- OpenAI GPT-4 (bring your own API key)
- Anthropic Claude (bring your own API key)
- Alt Kit Hosted ($3/month - no setup required)
## Privacy
- API keys stored locally on your device only
- Images sent directly to your chosen AI provider
- No tracking or data collection by the extension
## Features
- Automatic clipboard copy as fallback
- Works with React-based interfaces
- Lazy loading for minimal resource usage
The extension is free. You pay your AI provider directly for usage, or use our hosted plan for a flat monthly fee.
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Permissions and data
Required permissions:
- Access your data for sites in the mastodon.social domain
- Access your data for sites in the mastodon.online domain
- Access your data for sites in the mstdn.social domain
- Access your data for bsky.app
- Access your data for mastodon.social
- Access your data for mastodon.online
- Access your data for mstdn.social
- Access your data for deer.social
- Access your data for www.linkedin.com
- Access your data for linkedin.com
- Access your data for www.instagram.com
- Access your data for instagram.com
- Access your data for www.facebook.com
- Access your data for facebook.com
Optional permissions:
- Access your data for generativelanguage.googleapis.com
- Access your data for api.openai.com
- Access your data for api.anthropic.com
- Access your data for altkit.app
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 2.3.1
- Size
- 59.91 KB
- Last updated
- 19 days ago (Jan 17, 2026)
- Related Categories
- License
- All Rights Reserved
- Privacy Policy
- Read the privacy policy for this add-on
- Version History
- Tags
- Add to collection
1. Click the extension icon and select "Settings"
2. Choose your AI provider and enter an API key
3. Free API keys available at: https://aistudio.google.com/apikey (Google Gemini)
SUPPORTED SITES
Bluesky, Mastodon, LinkedIn, Instagram, Facebook
TIPS
- If auto-fill doesn't work on Instagram/Facebook, the alt text is copied to your clipboard - just paste it
- Enable "Copy to clipboard" in settings as a backup