how to free up space on a macbook air
by sumit paul · last updated
to free up space on a macbook air, open apple menu › system settings › general › storage, empty the trash, clear your downloads folder, remove apps you don't use, and turn on icloud's optimize options for photos and documents. if system data is huge, clear time machine snapshots and old iphone backups. the ssd can't be upgraded, so on a 256 GB air, large files like video belong on an external drive or in the cloud.
why the air fills up fast
a macbook air's storage is soldered to the main board, so there's no upgrade later. macos, its system files and a few apps take a good share of a 256 GB disk before you've saved anything. after that, a photos library, a few iphone backups and some 4k video can fill the rest within months.
step 1: see what's using it
choose apple menu › system settings › general › storage and wait for it to finish calculating. the colored bar shows the largest categories. click the info button (ⓘ) next to a category to see its files. under documents, the large files and downloads views and the file browser are the quickest way to find what's big.
step 2: the quick wins
- empty the trash. files in it still count. turn on empty trash automatically in the storage pane to remove items after 30 days.
- clean downloads. in finder, open downloads, switch to list view and sort by size. installers (.dmg, .pkg) and zip files you've already used can go.
- remove unused apps. in the applications info view, sort by size or last accessed. large creative apps and games you no longer open are the big ones.
- clear watched media. turn on optimize storage in the storage pane to remove apple tv movies and shows you've watched and keep only recent mail attachments.
step 3: photos and videos
if you use icloud photos, open photos › settings › icloud and choose optimize mac storage. full-resolution originals then stay in icloud and your mac keeps smaller versions when space runs low. it frees space gradually, not instantly, and it needs enough icloud storage for your whole library.
then open the recently deleted album and delete all. deleted photos otherwise wait there for 30 days. screen recordings and long videos are worth looking at one by one: in photos, media types › videos shows them together.
step 4: messages, mail and iphone backups
- messages: in the storage pane, messages' info view lists large attachments by size. you can also keep messages for 30 days or a year instead of forever in messages › settings › general.
- mail: in mail, choose mailbox › erase deleted items, and mailbox › erase junk mail.
- iphone backups: if you back up your iphone to the air, select it in the finder sidebar, click manage backups in the general tab, and delete old backups. the ios files row in storage shows how much they use.
step 5: system data
if system data is one of the biggest rows, restart first, which clears swap and temporary files. then check for time machine local snapshots with tmutil listlocalsnapshots / in terminal and remove them with sudo tmutil deletelocalsnapshots /. developer tools like xcode and docker can add tens of gigabytes. the full walkthrough, with what not to delete, is in why system data is so large.
step 6: store files in icloud
the storage pane's store in icloud option puts your desktop and documents folders in icloud drive and, with optimize mac storage on, removes older files from the air when space is needed, leaving a placeholder you can open later. two catches: opening a file downloads all of it again, and you'll likely need an icloud+ plan, since the free tier is 5 GB. see how optimize mac storage really works before relying on it.
keep big files off the air for good
cleaning gets space back, but a 256 GB air will fill again if you work with large files. pick a place for them:
| where | works well for | what to watch for |
|---|---|---|
| external ssd | editing big projects at a desk | has to be plugged in and carried |
| icloud drive (optimize on) | documents across apple devices | opening a file downloads the whole thing |
| google drive or dropbox apps | shared documents and photos | opened files download in full and stay |
| streaming cloud drive | video, raw photos, archives | needs an internet connection |
for video in particular, feather drive puts google drive and dropbox in finder and reads only the part of a file an app asks for, so footage opens in quicktime or final cut without being stored on the air. in a side-by-side test, a 1.22 GB video opened in 1.7 s, while google drive for desktop took 1 min 44 s because it downloaded the file first. it requires macos 26 or later, covers google drive and dropbox only, sees only the files you put in it, needs a connection to open files, and costs money after a 3-day free trial. if you edit offline a lot, an external ssd is the better fit.
related
- mac storage full: what to do
- why system data is so large, and how to shrink it
- how to get more storage on your mac without buying a new one
- how to edit videos on a mac with your footage in the cloud
common questions
how do i check storage on a macbook air?
choose apple menu › system settings › general › storage. the bar at the top shows what's using space by category, and the info button next to each category lets you see and delete files.
can i upgrade the ssd in a macbook air?
no. the storage in current macbook air models is built into the main board. to get more room you free space or move files to an external drive or the cloud.
is it safe to use a mac cleaner app?
you don't need one. storage settings, finder and a few terminal commands cover what cleaners do, and you see exactly what gets deleted. avoid any app that wants to delete system files for you.
how much free space should a macbook air have?
enough for macos to work comfortably and to install updates, which need room to download and unpack. if you're regularly under a few gigabytes free, it's time to move files off the internal disk rather than keep cleaning.