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About

Caesium Image Compressor lets you reduce picture file sizes by up to 90% without visible quality loss, delivering a free, open source solution designed for both simplicity and effectiveness. It offers a clean, real-time preview interface and batch processing so photographers, bloggers, webmasters, businesses, and casual users can optimize image libraries for storage, sharing, or web use while retaining visual fidelity. Advanced features include metadata preservation options and folder-structure support for streamlined workflows, and Linux or macOS users can harness the command-line tool for rapid, script-driven compression. For quick tasks or occasional use, the online compressor handles multiple images directly in your browser without any installation. Available as an installer or portable ZIP for Windows 10 (build 1809+) and as a DMG for macOS 10.15+, Caesium balances ease of use and advanced control across platforms.

About

Smart compression of images WordPress Plugin & API. Automatic. Protects your data. Ideal for editorial staff, photographers, bloggers. Optimus targets a lossless compression of PNG images and a slightly lossy compression of JPEG images of media uploaded to WordPress — while focusing on protecting your data. In plain terms: the visual appearance of treated images does not change in any way. The plugin slims down the original image and all preview images of an uploaded motif. An important difference to desktop and online optimization tools: Photoshop, ImageOptim, JPEGmin and TinyPNG only treat the original images, since thumbnails are only generated when that image is uploaded to WordPress. Optimus compresses all preview images as well (=thumbnails). Reduction of file size with no change in visible image quality.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Photographers, bloggers, webmasters and casual users requiring a solution to compress and optimize images up to 90% without quality loss in a fast, user-friendly tool

Audience

WordPress sites that want to optimize images

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

Free
Free Version
Free Trial

Pricing

$29 per year
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 5.0 / 5
support 4.0 / 5

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Saerasoft
United States
saerasoft.com/caesium

Company Information

KeyCDN
Founded: 2012
Switzerland
optimus.io

Alternatives

Alternatives

TinyPNG

TinyPNG

Tinify
Compress Image

Compress Image

Double Ape

Categories

Categories

Integrations

WordPress

Integrations

WordPress
Claim Caesium Image Compressor and update features and information
Claim Caesium Image Compressor and update features and information
Claim Optimus Image Optimizer and update features and information
Claim Optimus Image Optimizer and update features and information