Web Interface PRO is the paid version of Kraken.io’s web-based image optimization interface. It adds resizing and Dropbox synchronization to cloud compression, format conversion, and connected WordPress media processes.

Compress and convert files

The service processes JPEG, PNG, GIF, HEIC/HEIF, and PDF files. Choose intelligent lossy optimization to reduce image size while keeping the result visually close to the original, or lossless processing when preserving source data is the priority. JPEG quality and chroma subsampling can be set for each image.

Convert supported files among WebP, AVIF, JPEG, PNG, and GIF. These settings support workflows using newer image formats or traditional file types.

Resize pictures and sync with Dropbox

Set a maximum width or height to prepare oversized images for site use. The service enhances resized images to help maintain sharpness and reduce visible haloing. Sync-to-Dropbox delivers a way to move optimized files into a Dropbox process.

Process WordPress media

The connected WordPress extension can optimize new uploads and the thumbnail sizes WordPress generates. Process existing media from the Bulk Optimize screen or with the Media Library bulk action, which shows live progress.

A summary panel in the Media Library, Add Media, and Plugins screens, plus a Dashboard widget, displays connection status, plan, quota usage, active settings, and supported formats. The Media grid and list views show per-image savings and error badges.

The extension is designed for multisite installations, page builders, CDNs, and local or development websites. It can detect other image optimizer extensions and offer one-click deactivation to avoid competing optimization processes.

Connect and configure the plugin

Install the WordPress plugin, create or use an account, then connect the site with the API key and secret. After connection, choose optimization, conversion, and resizing settings. New uploads can then be processed automatically, and bulk utilities can process existing media.

API credentials are stored write-only and masked in the plugin settings. Optimization runs server to server with the service, and the plugin verifies upload content before processing.