Documentation Index
Fetch the complete documentation index at: https://www.alttextlab.com/docs/llms.txt
Use this file to discover all available pages before exploring further.
API key is missing
The extension has no API key configured. This happens when you haven’t added a key yet, or it was accidentally cleared. To fix:Get your API key
Log in to app.alttextlab.com, go to Settings → API Keys, and create a new key.
Open extension options
Click the AltTextLab icon in your browser toolbar (or find it via the puzzle/extensions icon) and open Options.
Invalid API key
The key entered does not match any active key in your account. This usually means the key was typed incorrectly, partially pasted, or has been deleted. To fix:Generate a fresh key
Log in to app.alttextlab.com, go to Settings → API Keys, and create a new key.
Replace the key in the extension
Open extension Options, clear the existing value, paste the new key, and click Save.
Out of credits
Your account has no remaining credits. Generation stops when the balance reaches zero. To fix:Upgrade your plan
Log in to app.alttextlab.com and go to Plans & Pricing.
Select a plan
Choose a plan that fits your usage and complete the payment. If you prefer not to commit to a subscription, enable Pay as you go to purchase credits as needed.
Something went wrong on the server
The server could not process the image. You are not charged credits when this happens. Common causes:- The image is behind a login, on a private network, or blocked by bot protection
- The image format is not supported
- A temporary API issue
- Open the image URL directly in a new tab — if it redirects to a login page, the image is not publicly accessible
- Try the extension in an incognito window or from a different network to rule out access restrictions
- Test with an image from a public site (e.g. unsplash.com) to confirm the extension works
- If the problem persists after a few minutes, contact support