How to Free Up Space on Mac: Complete Guide

Running low on Mac storage almost never comes down to one giant file you can simply delete. It's usually the slow buildup of hundreds of small things — caches, old downloads, leftover app files, forgotten large files — that quietly adds up over months or years. This guide walks through freeing up space in the order that actually matters: safest and most effective first.

Check how much space you actually have

Before deleting anything, see what you're working with. Click the Apple menu → About This Mac → Storage. macOS shows a colored bar breaking your disk down into categories like Applications, Documents, Photos, Messages, and a often-mysterious "System Data" (sometimes labeled "Other").

This view is a good starting point but it's fairly coarse — it won't tell you which specific apps have the largest caches, or which individual files are the biggest offenders. For that level of detail, a dedicated Mac storage analyzer gives you a much clearer picture of where space is actually going, category by category.

Empty the Trash (yes, really)

It sounds obvious, but it's the single most overlooked step. Deleting a file on a Mac doesn't free up space — it just moves the file to the Trash, where it sits taking up the exact same storage until you empty it. Right-click the Trash icon in the Dock and choose Empty Trash, or enable "Empty Trash automatically after 30 days" in Finder's settings if you'd rather not think about it.

Clear app caches safely

Most apps write cache files to ~/Library/Caches/ so they can start up faster or avoid re-downloading data. These files are generally safe to remove — apps are designed to rebuild their cache automatically the next time they run.

That said, ~/Library is easy to get wrong by hand. It's a mix of genuinely disposable cache folders and files that hold real settings or data (particularly inside ~/Library/Application Support/), and the two can sit right next to each other with similar-looking names. If you're comfortable navigating there yourself, stick to Caches folders specifically and avoid deleting anything you don't recognize. If you'd rather not risk it, CleanMyApple's junk cleaner identifies cache and temporary files specifically, and shows you what it found before removing anything.

Find and review large files

Large files hide in ordinary places: an old video export in Downloads, a duplicate Photos library backup, a forgotten virtual machine disk image, or a Xcode/developer cache that grew for months without anyone noticing. A handful of large files can outweigh cleaning caches entirely.

Finder's own search can help (search "This Mac", sort by size), but it's slow for a full-disk sweep. A large file finder built for this specifically will surface the biggest files across your whole Mac in seconds, so you can decide what's actually worth keeping.

Completely uninstall apps you don't use

Dragging an app to the Trash removes the app itself, but on macOS it typically leaves behind supporting files — preferences, caches, and Application Support data — scattered across ~/Library. Individually these are small, but across years of installed-and-forgotten apps they add up.

Our full guide on how to completely uninstall apps on Mac walks through doing this manually. If you'd rather not track down every related file yourself, CleanMyApple's app uninstaller identifies an app's associated files for you before removal.

Clean up your Downloads folder

The Downloads folder is a common blind spot — installers (.dmg files) you never deleted after installing an app, PDFs you opened once, screenshots, exported videos. Sort Downloads by size or date in Finder and clear out anything you no longer need. Installer files in particular are almost always safe to delete once the app is installed and working.

Manage Photos and Messages storage

If Photos or Messages show up large in the storage breakdown, a few macOS settings can help. In Photos, System Settings → Apple ID → iCloud → Photos offers "Optimize Mac Storage," which keeps smaller versions locally and full-resolution originals in iCloud. In Messages, old conversations with large video/photo attachments can be reviewed and deleted from within the Messages app itself.

What to do about "System Data"

"System Data" (or "Other") in the storage breakdown is a catch-all category — it includes caches, logs, temporary files, and things that don't fit cleanly into Photos, Apps or Documents. It's rarely one single thing you can delete, which is exactly why it feels so opaque. We cover what actually makes it up, and what's reasonable to do about it, in why is System Data so large on Mac.

When manual cleanup isn't enough

Everything above works, but it takes time and requires you to know where to look. A Mac cleaner does the finding for you — scanning junk files, large files, app leftovers, and giving you a clear storage breakdown in one place, so you're reviewing a short list of candidates instead of hunting through folders by hand.

Scanning is free with CleanMyApple regardless of which approach you prefer — it costs nothing to see exactly what's using your storage before deciding how to handle it.