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Image compressors for Mac

To make images smaller on a Mac, check which formats each app documents, whether it handles batches, and whether the free license covers your use. The apps below document image compression on macOS. Apps in this guide: Caesium Image Compressor, ImageOptim, XnConvert.

Conditions checked

  • macOS
  • Compress images

Before you choose

Compression results and quality aren't tested here. Some tools remove metadata or replace files in place; keep the originals until you've checked the output.

Documented conditions compared

Each cell reflects the catalog's current qualified sources for this platform. Not documented means unknown, not unsupported. Notes and sources are on each app below.

AppFreeBatch processingWebP files
Caesium Image Compressor DocumentedDocumentedDocumented
ImageOptim DocumentedDocumentedNot documented
XnConvert DocumentedDocumentedDocumented

Products with evidence for these conditions

Listed alphabetically, with no paid placement. Inclusion establishes these documented conditions, not a hands-on endorsement or a guarantee of fit.

  • Caesium Image Compressor

    macOS

    macOS · Compress images · Free · Batch processing · WebP files

  • ImageOptim

    macOS

    macOS · Compress images · Free · Batch processing

  • XnConvert

    macOS

    macOS · Compress images · Free · Batch processing · WebP files

    • Freeware for private or educational use, including non-profit organizations. Company use needs a paid licence, from €15 per licence; the page states the price only in euros.

Sources for the apps above were checked on 2026-09-26.

Common questions

Is there a free image compressor for Mac?

Free, as recorded here: Caesium Image Compressor, ImageOptim — Documented; XnConvert — Documented (Freeware for private or educational use, including non-profit organizations. Company use needs a paid licence, from €15 per licence; the page states the price only in euros). A free license can still exclude company use, so read each app's license note.

Does compressing an image lower its quality?

It depends on whether the tool compresses losslessly or lossily and on its settings. This guide hasn't tested output quality, so compare a few results before converting a whole folder.

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