How do I automatically compress images on Mac?

AutoShelf watches your folders and runs images through lossless or lossy compression as soon as they arrive. Set it once and every screenshot, photo, and export gets optimized automatically.

Will image optimization reduce quality?

Lossless mode preserves every pixel. Lossy mode reduces quality slightly but is tuned to be visually lossless; you will not notice the difference in normal use.

What image formats does AutoShelf support?

AutoShelf supports JPEG, PNG, and WebP. More formats may be added in future updates.

Is my image data sent to the cloud?

No. All optimization happens entirely on your Mac using local libraries. Zero network calls, zero uploads, zero data leaving your computer.

// autoshelf

Optimize and Compress Images on Mac Automatically

Screenshots, exports, photos, and graphics pile up fast. A single high-res PNG can be 5MB. Dozens of them waste gigabytes. AutoShelf watches your folders and automatically optimizes every image that lands there.

// the problem

Every image is a disk space problem waiting to happen

High-res screenshots can be 3-5MB each. Take a dozen and you have wasted 50MB.
Design exports and photo edits pile up in Downloads and Desktop without compression.
Manually running images through compression tools is tedious and easy to skip.
Many optimization tools require subscriptions or have privacy concerns with cloud uploads.

// how it works

Optimize as they arrive.

Pick a folder

Choose any folder AutoShelf should watch. Downloads, Desktop, a Screenshots folder, or your whole Pictures directory.

Set your quality

Choose compression level. AutoShelf balances quality and file size automatically, or you can set a specific quality target.

Watch it work

Every image that lands in your watched folder gets optimized instantly. File sizes shrink, but your images look the same.

// features

Smart image optimization

Lossless and lossy modes

Lossless compression preserves every pixel while reducing file size. Lossy mode offers greater reductions with imperceptible quality changes.

JPEG, PNG, and WebP support

Optimize all common image formats. AutoShelf uses macOS-native libraries for fast, local processing.

Batch optimization

Optimize new images as they arrive, or run a rule against existing files to compress everything in a folder at once.

100% offline and private

All optimization happens locally on your Mac. No uploads, no cloud processing, no privacy concerns.

// faq

Frequently asked questions

How do I automatically compress images on Mac?

AutoShelf watches your folders and runs images through lossless or lossy compression as soon as they arrive. Set it once and every screenshot, photo, and export gets optimized automatically.
Will image optimization reduce quality?

Lossless mode preserves every pixel. Lossy mode reduces quality slightly but is tuned to be visually lossless; you will not notice the difference in normal use.
What image formats does AutoShelf support?

AutoShelf supports JPEG, PNG, and WebP. More formats may be added in future updates.
Is my image data sent to the cloud?

No. All optimization happens entirely on your Mac using local libraries. Zero network calls, zero uploads, zero data leaving your computer.