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ImageOptim — Compress, Resize or Convert Images

Kornel Lesiński

ImageOptim is a free, open-source Mac app that you drag images into to shrink PNG, JPEG, GIF and SVG files; it is lossless by default and offers an optional lossy mode.

Why it fits

Compress, Resize or Convert Images

Desktop

Go to imageoptim.com

Good to know

Requires desktop installation.

Available features may vary by device and access method.

Good to know
Good to knowDesktop
Free outputYes
No account needed—
No watermark—
Works offline—
Batch processingYes
Content language—

— Unverified conditions. Official documentation reviewed. The app itself has not been hands-on tested. Matches only documented content-language support, not interface language.

Sources and review date1
Founder feedback and correction

Founder feedback and correction

If you represent this product, send a source-backed correction or update to the editors. Publication follows editorial review.

Editorial selection guide

Last checked:

Who is it for?

  • It suits Mac users who prepare many images for a website and want smaller files without changing how they look by default.
  • It suits you when you also want private metadata such as GPS position and camera serial numbers stripped before publishing.

Getting started

  • Download ImageOptim from its own page (it requires macOS 11 or later) and open it.
  • Drag your images into its window; it runs several optimization tools automatically.
  • Turn on lossy minification only if you accept some quality loss for smaller files, and keep a copy of the originals until you have checked the output.

Decision points

  • Choose it for a drag-and-drop workflow on a Mac; the page offers a Mac app, so on Windows or Linux use a cross-platform or web tool.
  • Use the lossless default for photos that must stay identical, and the lossy option when file size matters more.

Limits

  • The page lists PNG, JPEG, GIF and SVG; it does not describe resizing or conversion to other formats, so this record covers shrinking files only.
  • It requires macOS 11 or later and is distributed directly; the page warns about knock-offs in the App Store, so download it from imageoptim.com.
  • The page describes removing metadata such as EXIF and GPS data; if you need to keep camera data for an archive, check how the app treats it first.

Frequently asked questions

Is ImageOptim free?

The page says ImageOptim is free, open-source software under the GPL v2 or later and offers a free Mac download.

Does ImageOptim reduce image quality?

The default mode is lossless, which the page says preserves image quality exactly. Enabling lossy minification gives the smallest files.

Which formats does ImageOptim handle?

The page lists PNG, JPEG, animated GIF and SVG.

Official sources (1)
imageoptim.com/mac

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