Full walkthrough of the dashboard and all configuration options.

This guide provides a complete walkthrough of the Robin Image Optimizer dashboard and all available configuration options. It explains what each setting does, when to use it, and how it affects image optimization behavior.

Dashboard overview

The dashboard gives a high level view of your image optimization status.

You can see:

• Total images detected in the Media Library
• Number of original images and thumbnails
• Optimization status for originals, WebP, and AVIF
• Pending, converted, and error counts
• Overall size savings

From here, you can start bulk optimization or format conversion and monitor progress in real time.

Main settings

These settings control how images are optimized and delivered.

Compression mode

Defines the balance between image quality and file size:

• Lossless

  Optimizes images without visible quality changes. Recommended for most sites.

• Lossy

  Applies stronger compression with minor quality loss.

• High

  Aggressive compression for maximum size reduction.

• G PageSpeed

  Optimized to meet Google PageSpeed recommendations.

• Custom

  Allows fine tuned compression control.

Auto optimization on upload

When enabled, images are optimized automatically as soon as they are uploaded to the Media Library.

Recommended for most setups.

Backup images

When enabled, original images are backed up before optimization.

This allows you to restore originals later if needed.

Error log

Enables internal logging for optimization related errors.

Use this only for troubleshooting, as constant logging can impact performance.

Keep an error log on frontend

Logs optimization and delivery errors on the frontend.

Enable this only when requested by support.

Image format conversion

Controls which modern image formats are generated.

• Original

  No format conversion

• WebP

  Generates WebP versions of images

• AVIF

  Generates AVIF versions of images

You can enable WebP or AVIF depending on browser support and server capabilities.

Delivery mode for converted images

Defines how converted images are served on the frontend.

Redirection via .htaccess

Uses server level redirects to serve converted images.

Best performance option for Apache servers with WebP or AVIF support.

Not supported on Nginx.

Replace img tags with picture tags

Replaces image markup with <picture>  elements and adds modern formats to srcset .

Recommended for Nginx servers or when .htaccess redirects are unavailable.

Replace image URLs

Rewrites image URLs to point directly to converted formats.

Handles src, srcset, lazy load attributes, and inline styles.

No delivery

Converted images are generated but not served on the frontend.

Useful for testing or staging environments.

Manage backups

• Restore

  Restores original images from backup

• Clear backup

  Permanently removes stored backups

Leave EXIF data

When enabled, EXIF metadata is preserved during optimization.

Keeping EXIF data increases file size slightly.

This setting only applies to images optimized after it is enabled.

Optimization settings

These settings control how images are processed during optimization.

Optimization order

• Ascending

  Starts optimization with older images

• Descending

  Starts with the most recently uploaded images

Resizing large images

When enabled, images larger than the defined dimensions are resized.

• Maximum width in pixels
• Maximum height in pixels

Helps prevent serving oversized images.

Optimize formats

Select which image formats should be optimized:

• JPG
• PNG
• GIF

Optimize thumbnails

Choose which registered image sizes should be optimized.

These sizes usually come from WordPress, your theme, or plugins such as WooCommerce.

Scheduled and background optimization

Controls how optimization runs over time.

Background optimization type

• Scheduled

  Optimization runs at fixed intervals

• Background

  Optimization runs continuously in the background

Schedule frequency

When Scheduled is selected, choose how often optimization runs:

• 1 minute
• 2 minutes
• 5 minutes
• 10 minutes
• 30 minutes
• Hour
• Day

Images per iteration

Defines how many images are processed in each optimization cycle.

Lower values reduce server load. Higher values speed up optimization.

Best practices

• Use Lossless compression for production sites
• Enable backups before bulk optimization
• Start with Scheduled optimization on shared hosting
• Increase Images per iteration only after testing server limits

This guide provides a complete reference for configuring and managing image optimization using Robin Image Optimizer.