Caesium is an image compression software that helps you store, send and share digital pictures, supporting JPG, PNG, WebP, and TIFF formats. You can quickly reduce the file size (and resolution, if you want) by preserving the overall quality of the image.
Publisher’s description
What is Caesium Image Compressor?
Caesium Image Compressor is an open-source archiver program for Windows from SaeraSoft. It ranks 11th by popularity among archivers in this catalogue. It is written in C++.
Installation and requirements
Official installers exist for 64-bit as EXE (Inno Setup) and Portable. The installer supports unattended (silent) installation.
Updates and version history
The current version is 2.8.5, released on May 17, 2025. 12 versions are listed since June 14, 2022, each with links to its own installer files. That is about 4.1 releases a year. The last update is more than a year old.
Popularity and file types
The Chocolatey package has been downloaded 7,231 times. The source code on GitHub (Lymphatus/caesium-image-compressor) has 6,423 stars. On Windows it registers 6 file types, including .webp, .png, .jpg, .jpeg and .tiff. Similar programs include 7-Zip, PeaZip and Zstandard.
Project description on GitHub: “Caesium is an image compression software that helps you store, send and share digital pictures, supporting JPG, PNG, WebP and TIFF formats. You can quickly reduce the file size (and resolution, if you want) by preserving the overall quality of the image.”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Documented silent install
- Large user base
Cons
- No native ARM64 build
- No update for more than a year
In short: Caesium Image Compressor is an open-source archiver tool for 64-bit PCs. It is actively maintained. Administrators can deploy it unattended.
Is Caesium Image Compressor safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
AD8F3666FE79A9DBCADE28C065ABCC89E73082A678652A9B17A3B23016DF8498· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 12 versions ›12 versions over 3 years · about 4.1 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 2.8.5Latest | May 17, 2025 | — | 64-bit Portable64-bit EXE (Inno Setup) |
| 2.6.0 | February 2, 2024 | — | 64-bit EXE (Inno Setup) |
| 2.5.1 | February 2, 2024 | — | 64-bit EXE (Inno Setup) |
| 2.5.0 | August 14, 2023 | — | 64-bit EXE (Inno Setup) |
| 2.4.1 | June 28, 2023 | — | 64-bit EXE (Inno Setup) |
| 2.4.0 | May 26, 2023 | — | 64-bit EXE (Inno Setup) |
| 2.3.1 | February 18, 2023 | — | 64-bit EXE (Inno Setup) |
| 2.3.0 | January 25, 2023 | — | 64-bit EXE (Inno Setup) |
Install from the command line
Silent install ›winget install --id SaeraSoft.CaesiumImageCompressor -echoco install caesium.install -yscoop install extras/caesium-image-compressorcaesium-image-compressor-2.8.5-win-setup.exe /VERYSILENT /SUPPRESSMSGBOXES /NORESTART /SP-Related guide: How to use winget: install and update apps
Information
- Publisher
- SaeraSoft
- Category
- Archivers
- Licence
- GPL-3.0
- Price
- Free
- Source code
- github.com/Lymphatus/caesium-image-compressor
- Written in
- C++
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- EXE (Inno Setup), Portable
- Version
- 2.8.5
- Released
- May 17, 2025
- Added to the catalogue
- June 14, 2022
- Versions listed
- 12
- Updates / year
- 4.1
- Chocolatey downloads
- 7,231
- GitHub stars
- 6,423
- GitHub forks
- 370
- Website
- saerasoft.com
- winget ID
- SaeraSoft.CaesiumImageCompressor
- Chocolatey package
- caesium.install
- Scoop package
- extras/caesium-image-compressor
File types it opens (6)
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is Caesium Image Compressor free?
Yes. Caesium Image Compressor is open-source software under the GPL-3.0 licence.
Is Caesium Image Compressor safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install Caesium Image Compressor with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Can Caesium Image Compressor be installed silently?
Yes. The silent install page lists the exact command for each installer.
Does Caesium Image Compressor run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of Caesium Image Compressor?
The versions page lists all 12 versions with links to their official installer files, back to June 14, 2022.
What are alternatives to Caesium Image Compressor?
7-Zip, PeaZip, Zstandard, UPX and WinRAR. The alternatives page compares them.
