Make images lighter without degrading visual quality.

OIMG uses modern image compression techniques to reduce file size.

Download for macOS (Apple Silicon)

brewinstall--caskoimg

Open effortlessly

, , or .

The OIMG app window receiving an image via drag and drop.

The macOS Finder open-with menu showing OIMG as an available app.

A macOS terminal invoking OIMG from the command line with an image path.

Remain in control

OIMG provides you with in real time — so you can proactively set optimization thresholds, instead of worrying about unexpected quality drops.

Mount Fuji photographed at a distance under a pale sky.

← →

Original

Optimized

Navigate trade-offs

Compare outcomes before you commit. OIMG keeps the quality, size, and format trade-offs visible while you tune the export.

Compatibility? No problem.

Convert back to JPG or PNG on demand with one click—for example, when uploading onto websites that only support limited formats!

OIMG save-as JPG compatibility workflow.

Free and Open Source

OIMG is free for personal and academic use forever, and is open sourced under GPLv3 license. Please contact license@oimg.org to discuss custom license arrangements.

Source code @ GitHub Issue tracker