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Robin image optimizer — save money on image compression

Robin image optimizer — save money on image compression


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Make your website faster by reducing the weight of images. Our WordPress image optimizer plugin can cease image weights on 80% without any loss of quality.

Robin image optimizer is a smart and advanced image optimizer that really stands out among other WordPress plugins. Robin image optimizer is a WordPress free image optimizer plugin with zero limitations in terms of number of images and optimization quality. The only thing that you may stumble across is the image weight, which shouldn’t exceed 5 MB.

¿Para qué sirve la optimización de imágenes?

The lighter the weight of the image – the faster your page loads. With the constant growth of mobile users, increases the necessity in mobile websites optimization. If you don’t want to get many rejections and lose money due to the poor ad performances, we’d recommend you to start with image optimization.

Why should we use Robin image optimizer for image optimization?

  • The first and the most significant difference from the counterparts: our plugin is absolutely free and has the same features as paid products.
  • This WordPress image optimizer doesn’t have any limits or restrictions in image optimization.
  • Automatic optimization using Cron. You don’t need to wait til optimization is completed; the plugin will be optimizing couple of images every several minutes in the background.
  • Manual mass-optimization. Press the button and wait til your images are optimized
  • Image backup. Before optimization starts, all images are being stored in original quality. Then, when optimization is over, you can restore lost images or re-optimize them in another quality.
  • You can choose compression mode (normal, regular, high). Compression mode influences image weight and quality. The higher the compression, the worse is the quality and the smaller is the weight.
  • Image optimization on boot.
  • Reducing pre-optimization image weight by changing image size.
  • Estadísticas detalladas de las imágenes optimizadas

WP CLI commands (PRO)


  • wp robin optimize
  • wp robin stop
  • wp robin status

Available scopes

  • media-library
  • custom-folders
  • nextgen


We invite you to check out a few other related free plugins that our team has also produced that you may find especially useful:

Gracias a los autores de plugins

We used some useful functions from plugins Imagify Image Optimizer, Smush Image Compression and Optimization, EWWW Image Optimizer, reSmush.it Image Optimizer, ShortPixel Image Optimizer.


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  • The simple interface
  • Registro de optimización
  • Página de ajustes
  • Biblioteca de medios


  1. Upload robin-image-optimizer to the /wp-content/plugins/ directory.
  2. Activa el plugin a través del menú «Plugins» de WordPress.
  3. ¡Todas tus nuevas fotos se optimizarán automáticamente!


¿Por qué este plugin es gratuito y durante cuánto tiempo lo será?

Our WordPress plugin to optimize images uses API of this free service: https://resmush.it, So as long as these guys allow free image optimization, our plugin will remain free. Still, we have several ideas of how to make optimization free and planning to implement them in our plugin.

¿Hay algún límite para la optimización de imágenes?

There are no limits for image optimization in our plugin. The only thing we have is a kind of a restriction of image weight – it should be greater than 5 MB. But our plugin can reduce pre-optimization image weight, so you’ll be able to optimize almost all images you have.

¿Qué formatos de imagen son compatibles?

Robin image optimizer can optimize jpg, png and gif (both animated or not).

¿Suprimes los datos EXIF de las imágenes?

EXIF-data is removed by default. However, you can keep it by disabling the feature.

¿Suprimes las imágenes de origen?

No. Robin image optimizer replaces images with their optimized analogues. The backup option stores source images and allows restoring them in one click.

Can I re-optimize images in another mode?

Yes. By enabling the backup feature in the plugin, you can re-optimize any image using another compression mode.

Does plugin support WebP format?

Yes, use modern image formats, such as WebP. Robin image optimizer PRO automatically creates WebP copies of your original images.

Browsers with the WebP format support will display WebP images. Other browsers will replace such images with JPG, PNP, GIF, BMP, etc.
Learn more about PRO version

Plugin has integration with Nextgen gallery?

Robin image optimizer PRO has full integration with NextGen Gallery, which helps to use all the plugin features.
Learn more about PRO version


8 de julio de 2024 1 respuesta
This optimises images very well with 3 levels available. It also has a great UI that puts a lot of paid-for options to shame. EDIT – This plugin is now a scam. I purchased the access to a premium server which until a few months ago was working fine. However, the premium server now no longer works and it seems that it has been turned off. I have sent messages both to the developer of this plugin AND the payment company they use (Freemius) and have received no reply. I am now contacting my bank to request a refund. DO NOT GIVE ANY MONEY TO THIS COMPANY!
17 de julio de 2023
This was my message to the support team. «On my website, a 500 error has occurred since updating to the premium version with the license key as provided. I started the premium version two nights ago because I want to convert my images to the webp format. The CLS on my site is too poor, and the images significantly contribute to this. Since the activation, the 500 error has been occurring. Simultaneously with each error message, the plugin throws an error and mentions the Robin Image Optimizer (see screenshot). I had made/changed the following settings: from server 1 to premium server (it was displayed that I have to select this), I have reactivated the auto-optimization at upload and activated convert to webp – specifically, replace image URLs (redirection was allegedly not possible), Resize large images and also changed from scheduled to background. I have now switched back to scheduled, but the problem has not been resolved. Since activation (more than 30 hours have passed), only 0.8% of 1315 images have been optimized. I have the feeling that something is not right with the settings because I have been using the Robin Image Optimizer in the free version for about 1.5 years. Please help me as soon as possible.» After five days, I unfortunately had to deactivate, delete and replace the plugin with another one. I am now using Imagify, which works great. I have deactivated the license for Robin Image Optimizer. I am really upset that I paid for the premium version – simply for nothing. And now I’m paying again for another plugin. This is unacceptable. (I used free version before without any problem).
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Registro de cambios

1.7.0 (17.07.2024)

  • WordPress 6.6 Compatibility
  • Fixed: Minor bugs

1.6.6 (23.11.2023)

  • WordPress 6.4 Compatibility
  • Added: Compatibility with php 8.2

1.6.5 (27.05.2023)

  • Compatibilidad con WordPress 6.2
  • Añadido: Compatibilidad con PHP 8.1
  • Corregido: Fallos menores.


  • Corrección de la optimización de imágenes


  • Compatibilidad con WordPress 6.0


  • Corrección de errores


  • Actualizar módulos y compatibilidad con WP 5.8
  • Corrección de estadísticas


  • Añadido: Conversión independiente de la biblioteca de medios a WebP (PRO)
  • Corregido: Cancelar el proceso en segundo plano


  • Corregido: Error en la portada


  • Corregido: Compatibilidad con WP 4.8


  • Añadido: Optimización de la imagen en segundo plano al subirla
  • Añadido: Nuevo sistema de registro
  • Añadido: Salida del número total de imágenes para la optimización
  • Añadido: Traducción al ruso
  • Añadido: (PRO) Nuevo método de optimización: en segundo plano. (Este método funciona mucho más rápido, pero aún está en beta y desactivado por defecto. Puedes activarlo en los ajustes).
  • Añadido: (PRO) Comandos CLI de WP
  • Eliminado: Opciones de carga diferida
  • Cambios menores en la interfaz


  • Añadido: Formulario de suscripción
  • Corregido: Posible error de registro de la API Rest
  • Añadido: Compatibilidad con el plugin WP Retina 2x
  • Añadido: Insignia con la fecha de la próxima actualización de la cuota


  • Añadido: Opción de carga diferida para las imágenes


  • Corregido: jQuery.fn.load() y otros fallos después de la actualizacion a WordPress 5.5


  • Corregido: Problema al elegir un servidor de optimización en WordPress 5.5
  • Añadido: Modo de optimización para Google PageSpeed [PRO]


  • Corregido: La imposibilidad de cambiar el servidor si no está disponible después de seleccionarlo.
  • Añadido: Añadido el filtro wbcr/rio/backup/backup_dir para cambiar el directorio de copia de seguridad.
  • Añadido: Restricción de servidores gratuitos (a petición de los administradores de servidores gratuitos)
  • Función PRO modificada: La conversión a WebP no es posible sin utilizar un servidor Premium
  • Añadido: Posibilidad de optimizar archivos de formatos seleccionados (JPEG, PNG, GIF)
  • Añadido: Posibilidad de elegir el orden de optimización de las imágenes: empezando por las nuevas o empezando por las antiguas

1.4.2 (21.01.2020)

  • Corregido: Сompatible con Clearfy 1.6.3.
  • Corregido: Error PHP «Clase ‘Wbcr_FactoryClearfy_Compatibility’ no encontrada».
  • Corregido: Fallos menores.
  • Eliminado: Servidor 4 beta.
  • Añadido: Servidor Premium.

1.4.1 (24.12.2019)

  • Corregidos: Algunos fallos
  • Añadido: Сompatible con WordPress 5.3


  • Corregido: Advertencia PHP (Declaración de WRIO_Image_Statistic_Folders)


  • Corregido: Las páginas del plugin se cargaban durante mucho tiempo.
  • Corregido: Fallos en el registro de errores.
  • Corregido: Los avisos de error son ahora más comprensibles.
  • Corregido: Fallos de migración con plugins de caché.
  • Corregido: La optimización por lotes se detenía si se producía un error durante la optimización de la imagen.


  • Corregido: Errores menores


  • Fixed: PHP Error: Illegal mix of collations.
  • Fixed: Error 500 when trying to migrate.
  • Fixed: Context class not found error.
  • Corregido: Error fatal de PHP: Clase «WRIO_StatisticPage» no encontrada.
  • Corregido: Optimización automática al subir. Error en Gutenberg.
  • Corregido: Error al restaurar la copia de seguridad. Aumenta también la cuota de recuperación de la copia de seguridad.
  • Añadido: Compatibilidad con WordPress 5.2.x
  • Actualizado: Mejorado el registro de errores.


Fixed: On sites with php version 5.6 and below there was a syntax error.
Fixed: Broken links to support service.
Fixed: If site had a lot of images 15,000 and higher, bulk optimization page was loaded slow.


  • Añadido: Compatibilidad con WordPress 5.1.x
  • Añadido: Obligatoria la versión de PHP 5.4
  • Added: Last optimization log. You can view latest optimized images, as well as monitor errors when optimizing images.
  • Added: New server optimization (Server 4). The server is free, at the moment it is in beta mode.
  • Added: Custom quality values. You can set your own image optimization quality settings.
  • Added: Resize images in height and width. Previously, plugin automatically resized largest image side.
  • Added: Select the optimization mode. Before you start optimizing, you will see a modal window, which will offer you 2 modes of optimization (scheduled and manual).
  • Added: Improved error debug. Now you can learn more about all the errors in optimizing images using the powerful debug log.
  • Added: Server rating. Now you can easily choose a server to optimize images based on its rating.
  • Added PRO feature: WebP Conversion. Use modern image formats, such as WebP. Robin image optimizer PRO automatically creates WebP copies of your original images. Browsers with the WebP format support will display WebP images. Other browsers will replace such images with JPG, PNP, GIF, BMP, etc.
  • Added PRO feature: NextGEN Gallery Integrations. Do you use a popular plugin to create galleries? Robin image optimizer PRO has full integration with NextGen Gallery, which helps to use all the plugin features.
  • Added PRO feature: Compress any Image in any Directory. Optimize images of themes and plugins! Robin image optimizer PRO can optimize images in any directory. If the themes & plugins developers don’t optimize their products Robin will fix it!


  • Fixed: Added compatibility with ithemes sync


  • Fixed: Compatibility with W3 total cache
  • Fixed: Compatibility with External Media without Import


  • Corregidos: Algunos fallos
  • Corregido: Eliminado el límite de redimensión de las imágenes
  • Fixed: Update core framework
  • Añadido: Nuevo servidor gratuito
  • Added: Servers status, you can select available servers to optimize images
  • Añadido: Añadida compatibilidad con el plugin Clearfy
  • Preparando el plugin para compatibilidad con multisitio


  • Added: Ability to re-optimize images with errors.
  • Corregidos: Algunos fallos
  • Added: An alternative server for image optimization. Now you can select an alternative optimization server if the current server is unavailable.
  • Corregido: Problemas con las traducciones

= 1.0.7
* Fixed: Images are saved in a size 0 bytes
* Fixed: Trying to backup file with empty filename
* Fixed: Curl replacement for file_get_contents
* Fixed: Statistics


  • Fixed: fixed bar progress styles
  • Fixed: changed the link to the reviews page


  • Fixed: corrected image size calculations for individual optimization


  • Fixed: update core framework


  • Corregidos: pequeños fallos


  • Release