Web Interface PRO is the paid version of a web-based image optimization interface. It adds resizing and sync-to-Dropbox capabilities to cloud compression and format conversion.

Compression and file formats

The service works with JPEG, PNG, GIF, HEIC/HEIF, and PDF files, and can convert pictures among WebP, AVIF, JPEG, PNG, and GIF. Image optimization offers intelligent lossy processing to reduce file size while keeping images 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.

Resizing and Dropbox

Set a maximum width or height to resize images. The service enhances resized images to help maintain sharpness and reduce visible haloing. Sync-to-Dropbox provides a way to move optimized files into a Dropbox-based workflow.

WordPress media

The connected WordPress plugin can optimize new image uploads and the thumbnail sizes WordPress generates. Existing media can be processed from a Bulk Optimize screen or with the Media Library bulk action, with live progress during processing.

Kraken.io summary panels in the Media Library, Add Media, and Plugins screens, along with a Dashboard widget, show connection status, plan, quota usage, active options, and supported formats. Per-image savings and error badges appear in Media grid and list views.

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 prevent competing optimization processes.

Connect and configure

Install the WordPress plugin, make or use an account, then connect the site with an API key and secret. A free account includes testing quota, and paid plans are available as usage grows. After connecting, pick optimization, conversion, and resizing settings. Process new uploads or use the bulk tools for existing media.

The plugin stores API credentials as write-only values and masks them in its settings. Optimization runs server-to-server, and the plugin content-verifies uploads before processing.