About this plugin
Web Wonderland SEO Image Optimiser helps you improve image performance and accessibility without breaking your theme.
The plugin can:
- Convert images to modern formats (WebP/AVIF)
- Guide new users through a first-run setup assistant with recommended defaults
- Serve WebP/AVIF automatically on the front-end
- Generate resilient <picture> markup for improved Core Web Vitals
- Track generated derivatives in a manifest so front-end delivery can use known available WebP/AVIF sizes
- Run uploads, manual reprocessing and SmartAlt work through a persistent background queue
- (Optional) Generate AI-based captions, alt text and titles in the same language as the WordPress site language
- (Optional) Queue SmartAlt generation automatically for newly uploaded images with empty alt text
- Integrate with Gutenberg, classic themes, Elementor, WPBakery, etc.
- Use server-level rewriting or markup-based delivery modes
- Restore original images at any time
This is a third-party plugin developed by Web Wonderland.
It is not affiliated with or endorsed by WordPress, Elementor or WPBakery.
Local vs Cloud processing
The optimiser can work in two ways:
Local processing (always available)
Runs entirely on your own server.
- Unlimited WebP and AVIF generation (subject to your servers capabilities)
- No monthly conversion caps
- No api key required
- Uses your own CPU and disk I/O
Cloud/API processing (api key required)
Offloads heavy image work to the Web Wonderland Image API.
- Uses a remote worker to generate WebP/AVIF for originals and all sizes
- Reduces CPU load on your hosting, useful for busy or shared servers
- Quotas and limits depend on your Lite, Pro or Unlimited plan
- Works alongside local mode you can always fall back to local processing
You can choose your preferred processing mode in SEO Image Optimiser – Settings.
Free (Lite API Key)
The Lite API Key requires no card, only an email to issue an API key.
Included in the Lite API Key plan:
- Unlimited local image conversions (WebP/AVIF) on your own server
- Up to 50 cloud/API image conversions per month (WebP + AVIF) via the Web Wonderland Image API
- Front-end WebP & AVIF delivery if available
- Up to 30 AI alt tag & title generations per month
- Automatic backups of originals with one-click restore
- Works on one WordPress site
Your previously converted images remain on your server regardless of the API Key status.
If your monthly cloud API quota is reached, the plugin can still optimise images locally.
Pro API Key
For busy sites and image-heavy blogs.
Includes everything in Lite plus:
- Unlimited local image conversions (WebP/AVIF)
- Effectively unlimited cloud/API image conversions for most sites
(high cap WebP & AVIF generation via the Web Wonderland Image API)
- Up to 3,000 AI alt tag & title generations per month
- Background processing & bulk optimisation
- Can be used on up to 5 WordPress sites
Unlimited API Key
For agencies or users managing many sites.
Includes everything in Pro plus:
- Unlimited sites
- Unlimited local image conversions (WebP/AVIF)
- Unlimited cloud/API image conversions (WebP & AVIF for every image)
- Up to 10,000 AI alt tag & title generations per month
- Background processing & bulk optimisation
AI & Privacy
AI captioning is optional. If enabled, SmartAlt uses external services as documented in the External services section below. The plugin does not send personal data about site visitors.
External services
This plugin can connect to external services operated by Web Wonderland to provide optional “cloud” features (remote image optimisation and AI-powered SmartAlt captions). Local-only optimisation features continue to work without any external service.
When any cloud feature is enabled/used, the plugin sends requests from your WordPress server (admin-side actions) to the endpoints below. The plugin does not send personal data about site visitors.
1) Web Wonderland Image Optimisation API (Remote conversions)
Service: Web Wonderland Image Optimisation API
uk
Used for: Cloud/remote image conversions (WebP/AVIF generation) and job completion signalling.
Endpoints used:
uk/v1/jobs (create remote jobs)
uk/v1/jobs/{job_id} (poll remote job status and download manifest data)
uk/v1/jobs/{job_id}/complete (mark job completed)
Data sent:
– API key (sent as a request header)
– attachment ID and public image URL (or secure URL) for the image being processed
– derived image sizes and output settings (format, quality, width/height)
– plugin version, request schema version, site URL/basic site identifier where needed for returning results
When sent:
– Only when you enable Cloud/API processing and run optimisation from the plugin dashboard / bulk optimiser.
– Job status is polled while a remote job is running. The “/complete” request is sent after the plugin has successfully downloaded and stored the processed files.
uk/wwsio-terms/
uk/wwsio-privacy-policy/
2) Web Wonderland Cloud Services (Netlify-hosted endpoints)
Service: Web Wonderland Cloud Services endpoints (Netlify)
app
Used for: Site connect/disconnect, cloud api usage metering, background job coordination, and SmartAlt caption proxy.
Endpoints used:
app/api/sio/connect
app/api/sio/disconnect
app/api/sio/check-reserve
app/api/sio/cron-sites
netlify/functions/sio-smart-alt-new
Data sent:
– API key (Authorization: Bearer or X-API-Key header, depending on endpoint)
– plugin version
g. domain) and/or anonymous instance ID
– for remote cron coordination: the site heartbeat URL, per-site cron secret, queue pending flag, queue count and secret rotation timestamp
– for SmartAlt caption generation: the image URL, secure short-lived media URL or data URI for the selected image, plus structured context such as site language, attachment title, parent post/product context and requested response schema
When sent:
– Connect/disconnect: when you add or remove an API key in the Cloud Services screen.
– Metering: when cloud processing runs or when SmartAlt is used.
– Cron coordination: when the plugin is activated and when the optimisation queue state changes.
– SmartAlt caption proxy: when you click generate caption / suggestions in the SmartAlt admin screen, or when you enable SmartAlt on upload and upload an image with empty alt text.
uk/wwsio-terms/
uk/wwsio-privacy-policy/
3) Replicate (AI provider used by Web Wonderland Cloud)
com)
Used for: AI image captioning behind the SmartAlt feature (processed by Web Wonderland Cloud).
Data sent:
– the image data or image URL required to generate a caption (sent by Web Wonderland Cloud, not directly by your WordPress site)
When sent:
– only when you use SmartAlt caption generation in the plugin admin, or when SmartAlt on upload is enabled for new uploads.
SmartAlt responses may include structured metadata such as confidence score, detected language, decorative-image flag, warnings and keywords used. These values are stored as attachment metadata to support review workflows and safe auto-apply rules.
com/terms
com/privacy