Optimus – WordPress Image Optimizer vs Robin Image Optimizer – Unlimited Image Optimization, WebP & AVIF

WordPress Image Optimizer Optimus reduces the file size of uploaded media files automatically. Depending on the image and format, reductions in size of up to 70% are possible. Several kilobytes can be saved per image—these savings contribute positively to the performance of the blog website. What’s most impressive about the compression technology: the quality of the images is maintained. There are three different versions of Optimus: Optimus (Free) as base version with limitations (e.g. max of 100kb) Optimus HQ (Premium) with expanded functionality for personal projects Optimus HQ PRO (Premium) as professional solution for customer websites More details about the features and the pricing model on optimus.io How does it work? During the uploading process of images to the media library, the Optimus plugin simultaneously sends the images to the Optimus server, where the incoming material is processed and sent back in optimized form. Afterwards, the Optimus plugin saves the image version with a reduced file size in the media library. The optimization of images – including thumbnails – is conducted in the background and outside of the view of the user. The image compression gains per file are displayed by Optimus within the media library in form of a percentage value, see screenshot. Superfluous information that is saved by image processing programs and is not even necessary for displaying the image is extracted from image files. This way, the quality of the graphics remains intact while the image size can be reduced significantly. If you wish, Optimus keeps all author, EXIF and copyright information contained within the photos — the compressional gains will be correspondingly lower. Optimus supports the conversion of images to the new WebP image format. It is recommended to use the WordPress Cache Enabler plugin to integrate the converted WebP images. Features Progressive JPEGs Reduction of file size during the upload Optimization of all preview images of a photo No adjustments to code necessary Optional: no removal of EXIF and IPTC metadata Optional: HTTPS connection for the image transfer (Optimus HQ) Optional: conversion to the WebP image format (Optimus HQ) Faster load times for blog pages Support for WooCommerce WordPress multisite-support Bulk optimization (optimize existing images) Privacy After the image optimization and transfer process, the Optimus server immediately deletes all the temporarily stored files. No files are stored! The Optimus servers are located in Germany. Tips Photos should always be saved as JPEGs rather than PNGs. The PNG format works well for illustrations, JPEG on the other hand is the right choice for photographs. Another reason: the size reduction always works more quickly for JPEGs. Your images have been optimized using Desktop tools such as ImageOptim (Mac) or PNGGauntlet (Win) before you upload them? Optimus has the significant benefit of also minimizing the thumbnails (=preview images) created by WordPress. After all, themes almost always integrate thumbnails rather than original images. System Requirements PHP >=5.6 WordPress >=4.6 Allow outbound connections Storage Utilization Backend: ~ 0,19 MB Frontend: ~ 0,01 MB Website optimus.io Author KeyCDN

🚀 Make Your Website Faster by Reducing Image Weight Robin Image Optimizer is a WordPress image optimization plugin that can reduce image file size by up to 80% without visible quality loss. It helps speed up your site by compressing images, converting them to modern formats, and optimizing both new and existing images automatically. Robin Image Optimizer is a smart and advanced free image optimization plugin for WordPress, built with no limits on the number of images, no API keys, and no external CDN dependency. It works locally inside WordPress and supports automatic image optimization, bulk image optimization, and WebP conversion. Robin is built for site owners who want free image optimization, unlimited WebP conversion, and a simple, local solution that works directly inside WordPress. At a Glance 📌 Unlimited image optimization (no limits) 📌 Automatic optimization on image upload 📌 Bulk optimization for existing media 📌 WebP conversion (JPG, PNG, GIF) 📌 Runs locally inside WordPress 📌 No API keys, no external CDN Quick Links 📘 Documentation – Complete setup and configuration guide 💬 Support Forum – Community help and expert support ⭐ Go Pro – Unlock advanced features and priority support What Robin Does Robin improves WordPress performance by optimizing images throughout your entire workflow. Images are optimized automatically when they’re uploaded, and existing images in your media library can be optimized in bulk. This reduces manual work and keeps your site fast as it grows. By compressing images and converting them to modern formats like WebP, Robin helps reduce overall page size. This results in faster load times, better performance metrics, and a smoother user experience, especially on mobile devices and image-heavy pages. With Robin, you can: Automatically optimize images on upload Bulk optimize existing images in the media library Convert images to modern formats like WebP and AVIF in PRO Reduce image weight and overall page size Improve loading speed and PageSpeed audits Run everything locally without API keys or CDN dependencies This makes Robin a reliable choice for bloggers, content websites, and performance-focused WordPress sites. Why Image Optimization Matters ⚡ The lighter the image, the faster your page loads. Images are often the most significant contributor to page size on WordPress websites. As mobile usage continues to grow, image optimization has become essential for delivering fast, responsive experiences. Unoptimized images can lead to: Slower page loads Higher bounce rates Poor ad and conversion performance Lower engagement on mobile devices Image optimization reduces image file size while preserving visual quality, helping pages load faster without sacrificing quality. How Robin Optimizes Images Robin analyzes each image and applies compression based on the selected optimization mode. Optimization happens automatically and safely, without blocking the WordPress admin interface or requiring manual intervention. ⚙️ Automatic Image Optimization Images are optimized automatically as soon as they are uploaded to WordPress. No manual steps are required, and the optimization process runs quietly in the background. This ensures that all new images added to your site are optimized by default, without interrupting your workflow. 📦 Bulk Image Optimization Robin supports manual bulk optimization for images that already exist in the media library. With a single action, you can start optimizing previously uploaded images. The optimization process runs in batches, making it suitable for large media libraries with thousands of images. This is especially useful for existing WordPress sites that want to reduce page size and improve performance without re-uploading content. 🎚️ Compression Modes Robin provides multiple compression modes so you can choose how aggressively images are optimized. Lossless compression: Reduces image file size without any visible or measurable quality loss. Ideal for logos, illustrations, and high-fidelity images. Lossy compression: Applies stronger compression while keeping quality changes minimal and usually unnoticeable. A great default for most WordPress sites. High compression: Uses more aggressive optimization techniques to achieve maximum file size reduction. Best for performance-focused and image-heavy pages. PageSpeed compression (Pro): Applies optimization settings tuned specifically for improving PageSpeed and performance audits. Custom compression: Allows you to define your own quality level for full control over optimization behavior. 🖼️ Modern Image Formats: WebP & AVIF Robin converts supported image formats such as JPG, PNG, and GIF into WebP, a modern image format that produces smaller files while maintaining visual quality. WebP images are generated automatically when images are uploaded or optimized in bulk. Optimized WebP images are served automatically to browsers that support them. When a browser does not support WebP, Robin safely falls back to the original image format to ensure full compatibility across devices. WebP conversion is available in the free version of Robin with no limits on the number of images. Images are converted automatically and served in the best format supported by each browser. Robin free supports: JPG to WebP conversion PNG to WebP conversion GIF to WebP conversion Other common image formats used in WordPress are also supported, with automatic fallback to ensure compatibility across all browsers and devices. 🏆 Robin Pro adds support for AVIF, a next-generation image format that can deliver even smaller file sizes than WebP in many cases. Safe fallbacks are applied automatically. 💾 Image Backup and Restore Before optimizing any image, Robin stores a backup of the original file. You can restore original images at any time or re-optimize them using different compression settings. This makes it safe to experiment with optimization modes without the risk of permanent changes. 🧾 Strip EXIF data Robin allows you to choose whether EXIF metadata should be removed or preserved during image optimization. Removing EXIF metadata helps reduce image file size and improves privacy. Keeping EXIF metadata is useful for photography portfolios or workflows that rely on image data. 🔄 Background Image Optimization (PRO) Robin supports background image optimization, allowing images to be processed gradually over time without blocking the WordPress admin interface. Background optimization uses scheduled processing to continuously optimize images, preventing timeouts and performance issues when working with large image libraries or frequent uploads. 📁 Custom Folder Optimization (PRO) Robin can optimize images stored outside the WordPress Media Library, including images located in custom folders such as theme directories and plugin assets. This is useful for: Custom WordPress themes Plugins with bundled image assets Performance-focused sites using custom directories Advanced or custom-built WordPress setups WP CLI commands (PRO) Commands wp robin optimize wp robin stop wp robin status Available scopes media-library custom-folders nextgen Use Cases Robin Image Optimizer fits naturally into a wide range of WordPress workflows, from small blogs to performance-focused websites. 📝 Blogs & Content Websites Perfect for bloggers and content creators who upload images regularly and want automatic image optimization without manual work. Images are optimized on upload, keeping pages fast as content grows. 🖼️ Image-Heavy Pages & Media-Rich Sites Ideal for galleries, portfolios, landing pages, and visual storytelling sites where images contribute heavily to page weight. Bulk optimization and higher compression modes help significantly reduce page size. ⚡ Performance-Focused WordPress Sites Great for site owners focused on speed, Core Web Vitals, and PageSpeed audits. Optimized images and modern formats like WebP help improve loading performance across desktop and mobile. 🏗️ Existing WordPress Websites Useful for established sites with large media libraries. Previously uploaded images can be optimized in bulk without re-uploading or rebuilding content. 🌍 Sites Without a CDN A reliable solution for websites that don’t use a CDN. All image optimization and WebP conversion happen locally inside WordPress, with no external services or API keys required. 🧩 Custom Themes & Advanced Setups Suitable for custom WordPress themes and advanced setups where images live outside the Media Library. Custom folder optimization allows full-site image optimization beyond standard uploads. What Users Say About Robin ★★★★★ Excellent plugin “I use Robin on all my WordPress sites. It’s easy to set up, effective, and really helps reduce loading times.” ★★★★★ Great plugin “A free image optimization plugin without image limits? Really impressive.” ★★★★★ Don’t waste time on others “This has to be the best free optimizer I’ve tried. Fast, simple, and very efficient.” ★★★★★ Great plugin. Nice work “Saves a lot of time and reduces disk space usage.” ★★★★★ Thank you Robin Hood “I tried many other image compression options — this one works best.” Support Need help? Open a new thread in the Support Forum, and we’ll be happy to assist. 📘 Documentation Discover how to make the most of Robin with our detailed and user-friendly documentation.