Projects / Caesium Image Compressor

Caesium Image Compressor

Audio & Video

Compress batches of images with quality and size controls and previews, using a desktop GUI or the linked browser compressor.

Use with conditions
Last updatedRelease 2025-05-17
Open source licenseGPL-3.0
PlatformsWindows 10 build 1809+ (64-bit) · macOS 12+ (64-bit) · Linux (build or third-party package) · Web browser (linked online compressor)
DeploymentDesktop / Web

About this project

Caesium Image Compressor is a graphical tool for reducing image size before storing or sharing pictures. The official product page describes batch processing, real-time previews, metadata controls and folder-structure support. Users choose an output quality and can also reduce image dimensions; the purpose is image optimization rather than photo editing.

The official desktop release offers a Windows installer, a portable Windows archive and a macOS DMG. The README specifies 64-bit Windows 10 build 1809 or later and macOS 12 or later. Linux is supported through a source build or a separately maintained third-party package, not an official Linux binary in the current stable assets.

The desktop application supports JPG, PNG and WebP images. Its official README lists English as fully translated and several other languages as only partly translated, so language coverage varies. Users compiling their own copy are advised to select a release tag because the main branch can contain unstable code; this source-build path also requires Rust and the Qt6 SDK.

Decision guide
01

Why it is worth a look

  • A graphical workflow for reducing image file size
  • Official Windows installer, portable archive and macOS download
  • A linked browser option for small batches without a desktop install
02

Before you use it

  • Desktop packages support 64-bit Windows 10 build 1809+ and macOS 12+
  • The official README directs Linux users to compilation or a third-party build; current official stable assets have no Linux binary
  • The browser accepts at most 10 files, each no larger than 20 MB, in JPG, PNG or WebP
  • Lossy output trades size against image quality; keep original images separately
Manual setupLow
With an AI agentLow
DeploymentDesktop / Web
Additional requirementsNot verified

64-bit Windows 10 build 1809+ or macOS 12+ for the official desktop binary; Permission to install or run a local graphical application; Original image files retained separately; Some requirements have not been verified. Check the official setup instructions.

03

What it can do

  • Batch image compression
  • Adjustable output quality and image dimensions
  • Real-time image previews
  • Browser compression for JPG, PNG and WebP

Who it fits

Good for

Shrinking photo or screenshot files before storage or sharing; People who prefer quality previews to command-line compression

Not a fit

Assuming every Linux download is an official stable build; Assuming all compression modes preserve every image detail

Getting started

  1. Choose the stable official Windows installer, portable archive or macOS DMG
  2. Install or launch the desktop package and add the images to process
  3. Choose output quality and dimensions and inspect the preview
  4. Write compressed outputs while retaining the original images separately