What Is Taking Up Storage on My Mac?

The built-in storage panel on macOS Ventura and later provides the fastest way to understand where your disk space is going. Click the Apple menu, then System Settings, then General, then Storage. A horizontal bar chart appears at the top of the panel, with each segment colored and labeled by category.

Hovering over a segment reveals the exact size in gigabytes. Clicking a category like Applications or Documents opens a detail view where you can sort items by size and delete them directly. The macOS and System Data segments are not clickable in the same way, since those files are managed by the operating system.

This overview is useful for identifying which broad category is consuming the most space. However, it does not always show individual folder sizes or provide granular file level detail. For that, you need Finder, Terminal, or a dedicated monitoring tool.

System Data is one of the most confusing categories in the macOS storage breakdown. Unlike Applications or Documents, it does not correspond to a single folder. Instead, it aggregates files from multiple system directories that macOS uses for internal operations, including /Library/Caches, ~/Library/Caches, /private/var/vm, and /var/log.

Time Machine local snapshots are often the largest contributor. macOS creates hourly snapshots on the boot volume so you can recover files even when the backup drive is disconnected. If the backup drive has not been connected in several days, these snapshots can accumulate to 50 GB or more.

Restarting your Mac clears swap files and releases virtual memory back to the system. Deleting Time Machine local snapshots with sudo tmutil deletelocalsnapshots in Terminal can reclaim significant space immediately. The Spotlight index typically occupies 1 to 5 GB and rebuilds automatically if corrupted, temporarily using additional disk space during reindexing.

Open Finder and press Command+F to start a search. Change the first dropdown from "Name" to "File Size," set the condition to "is greater than," and enter 1 GB. Make sure the search scope is set to "This Mac" so it scans the entire drive. Sort the results by size to see the largest files first.

For a command line approach, open Terminal and run find / -size +1G -type f 2>/dev/null to list every file on the system larger than 1 GB. The 2>/dev/null suppresses permission errors for protected directories. This is especially useful for finding large files in hidden or system directories that Finder may not display by default.

You can also sort any Finder window by size to quickly identify large items. The two directories most likely to contain forgotten large files are ~/Downloads and ~/Desktop. Installers, disk images, video recordings, and compressed archives tend to accumulate in these locations without being cleaned up.

Applications: Installed apps can range from 50 MB to over 20 GB each. Professional tools like Xcode, Final Cut Pro, and Logic Pro are among the largest. Games downloaded from the Mac App Store or Steam can also consume tens of gigabytes.

Developer: If you have Xcode installed, the Developer folder and its associated simulator runtimes, derived data, and archives can use 30 GB or more. iOS and watchOS simulator images alone account for several gigabytes each.

Downloads: This folder often fills with forgotten installers, .dmg files, video downloads, and compressed archives. It is one of the easiest places to reclaim space since most files in Downloads are temporary by nature.

Documents: User files, databases, virtual machine images, and project folders live here. Virtual machines (Parallels, UTM, VMware) can consume 20 GB or more per image.

Library: The ~/Library folder contains application support data, caches, mail attachments, and preferences. It is hidden by default in Finder. Use Shift+Command+G and type ~/Library to access it.

Photos, Movies, and Music: The Photos library can grow to hundreds of gigabytes if you store original resolution images and videos locally. Movies and Music folders hold media from Final Cut Pro exports, GarageBand projects, and downloaded content.

MoniThor calculates the actual disk space used by each folder, providing an accurate picture of real storage consumption rather than just logical file sizes. The scan is fast and lightweight, skipping hidden files and package contents to keep overhead minimal.

The results are displayed as a sorted list of storage categories, largest first. Each entry includes a name, icon, and formatted size. Only categories larger than 1 MB appear in the list, keeping the display clean and focused on meaningful consumers. This breakdown refreshes every 60 seconds, so you always see an up to date view of where your storage is going.

External volumes are also detected automatically and displayed with their used and total capacity alongside a usage bar. When you connect a USB drive, SD card, or external SSD, MoniThor shows it immediately without any configuration. This gives you a unified view of all connected storage from a single menu bar panel.

Start by emptying the Trash. Files moved to Trash still occupy disk space until you right click the Trash icon in the Dock and select Empty Trash. On a Mac that has not been emptied in months, this alone can recover several gigabytes.

Delete applications you no longer use by dragging them to the Trash or using the storage manager in System Settings > General > Storage > Applications. Sort by size and remove the largest unused apps first. Xcode, for example, can consume over 15 GB on its own.

Clear your Downloads folder of old installers, disk images, and compressed archives. Sort by date to find files that have been sitting untouched for months. If you need to keep some files, move them to an external drive or cloud storage rather than leaving them on the boot volume.

Enable "Optimize Mac Storage" in System Settings > Apple ID > iCloud > iCloud Drive. This feature automatically offloads older files to iCloud and keeps only recently accessed files on the local drive, freeing significant space if you have a large iCloud storage plan.

Delete Time Machine local snapshots if you have a separate backup. Open Terminal and run tmutil listlocalsnapshots / to see snapshots, then sudo tmutil deletelocalsnapshots YYYY-MM-DD-HHMMSSto remove them. Review large mail attachments in Mail > Preferences > Accounts and consider removing old messages with large files. Finally, move photo and video libraries to external storage if your internal drive is consistently running low.