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Filestack Alt Text Generator

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Filestack Alt Text Generator

by Ankur Patel (Filestack)

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Description

Filestack Alt Text Generator creates descriptive alt text for your WordPress images using the Filestack Caption API. Improve your site’s accessibility and SEO with AI-generated image descriptions, individually or in bulk.

Features

  • Bulk Processing: Generate alt text for all images at once with a single click
  • Smart Detection: Processes only images missing alt text. Your manual entries stay intact.
  • Real-time Progress: Live progress bar shows exactly how many images have been processed
  • Media Library Integration:
    • Alt text status column showing which images need attention
    • Bulk action to generate alt text for selected images
    • Generate button on individual image edit screens
  • Pause & Resume: Ability to pause processing and resume later
  • Error Handling: Logs errors automatically and continues processing. Get a full summary of processed, skipped, and error counts when complete.
  • Secure API Storage: Safely stores your Filestack credentials using WordPress options API, with masked API key field
  • Test Connection: Verify your API credentials before processing
  • WordPress.com CDN Proxy: Optional setting to proxy image URLs through the WordPress.com CDN (i0.wp.com) for sites where images are not directly accessible by the Filestack API

How It Works

  1. Install and activate the plugin
  2. Configure your Filestack API credentials in Settings > Filestack Alt Text
  3. Test your API connection to ensure everything works
  4. Navigate to Media > Generate Alt Text to process images in bulk
  5. Or use the bulk actions in the Media Library to process specific images

Requirements

  • WordPress 5.8 or higher
  • PHP 7.4 or higher
  • Filestack API account with API Key, Policy, and Signature

External services

This plugin relies on the Filestack Caption API to generate alt text for images.

What data is sent and when

  • When you generate alt text (individually, in bulk, or via the “Test Connection” button), the plugin sends the public URL of each image to the Filestack Caption API.
  • The API endpoint used is https://cdn.filestackcontent.com. Your configured API Key, Policy, and Signature are included in the request URL for authentication.
  • No other user data or site data is transmitted.

Service links

  • Filestack website: https://www.filestack.com/
  • Terms of service: https://www.filestack.com/terms/
  • Privacy policy: https://www.filestack.com/privacy/

Support

For support, please visit the plugin’s support forum on WordPress.org or contact your plugin developer.

  1. Upload the filestack-alt-text-generator folder to the /wp-content/plugins/ directory
  2. Activate the plugin through the ‘Plugins’ menu in WordPress
  3. Go to Settings > Filestack Alt Text to configure your API credentials
  4. Start generating alt text from Media > Generate Alt Text
  1. Settings page for configuring Filestack API credentials

    Settings page for configuring Filestack API credentials

  2. Bulk processing page with real-time progress

    Bulk processing page with real-time progress

  3. Media Library integration showing alt text status

    Media Library integration showing alt text status

  4. Individual image edit screen with generate button

    Individual image edit screen with generate button

Where do I get my Filestack API credentials?

You need to sign up for a Filestack account at https://www.filestack.com/signup-start/. Once you have an account, login to the Filestack DevPortal at https://dev.filestack.com/ to get your API Key and generate your Policy and Signature keys.

Will this overwrite my existing alt text?

The plugin only generates alt text for images missing descriptions. Existing alt text is always preserved.

Can I pause the bulk processing?

Yes! You can pause the processing at any time and resume it later. Your progress is maintained.

How many images can I process at once?

The plugin processes images in batches of 5 to avoid server timeouts. You can process as many images as you need – the plugin will handle them automatically in batches.

What happens if the API fails?

The plugin logs any errors and continues processing the next image automatically. When complete, you get a full summary of processed, skipped, and error counts.

1.0.2

  • Improved plugin description and feature descriptions for clarity
  • Updated FAQ answers for conciseness
  • Updated Filestack signup URL

1.0.1

  • Added “What’s Next?” guidance section on the Settings page with links to bulk processing, media library bulk actions, and single image generation

1.0.0

  • Initial release
  • Bulk alt text generation
  • Media Library integration with status column and bulk actions
  • Real-time progress tracking with pause/resume
  • Test API connection feature
  • Filestack branding and DevPortal link on admin pages
  • API Key field masked with show/hide toggle
  • Link to Filestack security policies documentation
  • WordPress.com Image CDN Proxy option for restricted image access
  • API credentials validation with user-friendly error messages
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