ImageOptim
Lossless image compression for Mac. Smaller PNGs and JPEGs without a SaaS upload.
Quick facts
- Price model
- Free
- Starting price
- Free
- Best for
- Web image prep · Email attachment shrinking · Batch PNG optimization
- Replaces
- TinyPNG Pro, Squoosh uploads for bulk work, Compressor.io subscriptions
- Platforms
- Mac
- Last verified
- 2026-06-22
Why it's listed
Files never leave your machine. Fast batch drops for entire export folders.
ImageOptim strips metadata and squeezes file size for web and email attachments locally. Free, drag-and-drop, and trusted by designers who refuse to upload client assets to random online compressors.
The catch
macOS focused; not a full editor. Aggressive settings can soften fine detail.
Good fit for
- Web designers
- Shopify sellers
- Newsletter writers
Not ideal for
- RAW photo development
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