Zipic Is Good. I'm Still Not Switching From Clop.

Is it possible to shrink image file sizes on a Mac using native tools? Yes, but with some big IFs thrown in. Preview can knock a file's size down if you dig into the export dialog and guess at a quality slider, and Photos will do the same on export, but neither remembers what you did last time or watches a folder for you. That's way too much friction when alternatives exist. No one wants to live like an animal.

Image compression is a solved problem and it has been for a while. What separates a good tool from a mediocre one isn't the compression algorithm, it's whether the tool disappears into your workflow or makes you think about it. Zipic is a native Mac app built around that idea: drag, drop, done, with the automation layered on top of an engine, mozjpeg, pngquant, and friends: that's the same open-source stack most of this category runs on.

I compared Zipic to my current image compression stack, and while I found it useful, except for one narrow scenario, it doesn't beat what I currently use.

What it actually does

Zipic, from 5KM Tech, compresses, converts, and resizes 12 image formats, all locally on the Mac with no upload step. Free tier gets you a 7-day full-Pro trial, then 25 compressions a day with basic formats (JPEG, PNG, WebP, HEIC, GIF). Pro is a one-time purchase ($19.99 for one seat, $29.99 for two) with lifetime upgrades. There's no subscription option. Purchasing a license unlocks unlimited compression and additional formats (AVIF, JXL, TIFF, ICNS, PDF, SVG, APNG). The killer features are folder monitoring and clipboard auto-compress.

Why you'd want this

• It turns image compression from a chore into an automated part of your workflow. Point it at a folder (your screenshots directory, an export folder from a design tool) and it compresses anything new that lands there, no interaction required.
• It compresses any image you copy to your clipboard. Pair it with Shottr or CleanShot X to compress every screenshot you take. It starts to feel like part of the OS very quickly.
• Most compression apps stop at JPEG/PNG/WebP. Zipic's Pro tier adds AVIF, JPEG XL, TIFF, ICNS (useful if you're building app icons), PDF, SVG, and animated formats (GIF, APNG, animated WebP) in the same batch window.
• You can access Zipic from the Finder context menu, from Raycast, or from Shortcuts. Rather than forcing you into a single entry point, this tool fits into several popular workflows.
• If you don't have your notch occupied by Droppy or another app, you can use it as a drop location. Drag images to the notch and Zipic compresses them without you ever opening the app window. It's a small feature and a little gimmicky, but it's an easy way to compress one file without breaking your flow when you're busy doing something else.

What I use

I've used two specific tools in this space for a long time. They both have long track records and tons of testimonials from satisfied users, including me. At this point, I'm not ready to let them go.

ImageOptim is free and open source (donationware), the long-standing default recommendation in this category. It's lossless-focused, has no format conversion, no folder watching, and no clipboard automation. It's a drop-a-folder-on-the-dock tool, not a workflow layer. I use it for occasional lossless squeezing since it costs nothing. ImageOptim - Free and Open-Source Utility to Reduce File Sizes | AppAddict

Clop: Copy Big, Paste Small, Send Fast. Zipic's biggest differentiator over ImageOptim is automation. Against Clop, though, that advantage largely disappears. Clop offers the same folder watching and clipboard automation, costs just €15 as a one-time purchase, is open source, and also compresses videos and PDFs, something Zipic doesn't do. Zipic's remaining advantage is its broader support for image formats like AVIF, JPEG XL, ICNS, and SVG. Those formats aren't part of my workflow, so I'm sticking with Clop and The Low Tech Guys.