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macOS tucks away system files, configuration data, caches, and app support folders so you don’t accidentally delete something your Mac depends on. Over time, though, these files can accumulate and take up more space than they need to.

The good news is that you can view hidden files, understand which types are usually safe to remove, and clean things up more carefully. The key word is “safely” — not every hidden file is clutter, and knowing the difference matters.

In this guide, you’ll learn how to find and delete hidden files on your Mac, which ones are best left untouched, and how to handle any files that seem out of place.

What are hidden files on Mac?

Hidden files are files and folders that macOS deliberately keeps out of sight in Finder. Not all are harmful or unnecessary. Some exist to help your Mac and apps function correctly, so hiding reduces the chance of you moving, modifying, or deleting them by mistake.

Usually, these files hold things like temporary data, app settings, and system logs: the small pieces of information your software and macOS keep track of behind the scenes.

Even so, some of these files eventually outlive their usefulness. When you delete an app, it can leave behind old settings or temporary data that sits there, slowly taking up space you could use for other things.

What matters is knowing the difference between the files your Mac still relies on and the ones that are safe to let go.

How to show hidden files in Finder

You can unhide hidden files on Mac using this quick keyboard shortcut while you’re in Finder:

1. Open Finder and go to the folder you want to look into.
   
2. Press Command + Shift + Period (.)
3. Look for the hidden items to appear. They show up slightly faded or translucent, a sign that macOS normally keeps them out of sight.
   
4. Press the same shortcut again to hide them.

How to open the hidden Library folder

The Library folder stores app settings, preferences, caches, and support files your Mac uses in the background.

macOS keeps it out of sight because it contains items your apps may rely on to run correctly. You can get to the folder using either of these quick methods.

Option 1: Use the Go menu in Finder

1. Open Finder.
2. Click Go in the menu bar.
3. Hold down the Option key.
4. The Library folder should appear in the list; click it to open it.

Option 2: Use Go to Folder

1. Open Finder.
2. Click Go in the menu bar, then select Go to Folder.
3. Type “~/Library” and press Return.

Before deleting anything, make sure you know exactly what the file or folder does. If you delete something you don’t recognize, an app might lose your preferences or stop running the way it’s supposed to.

Which hidden files are usually safe to delete?

Not all hidden files are worth keeping, and some do accumulate over time in ways that reduce your available storage. The types of files listed below are usually fine to remove, though it’s still best to double-check before you delete anything permanently.

Leftover files from uninstalled apps

When you delete an app, it often leaves its settings, saved preferences, and temporary files behind on your Mac. If you know you won’t use that software again, you don’t need to keep these old pieces.

Selected cache files

These are temporary files that your system and apps create so they can perform well. They can build up over time, though, and take up more room than they should.

It’s safest to only remove caches belonging to a specific app you recognize, rather than emptying entire system folders. Make sure to close the app completely before you clear anything, or it might not run correctly afterward. Restart your Mac afterward so the system can recreate whatever cache it actually needs.

Old Mail downloads and attachment copies

When you open an attachment in Mail, it saves a copy on your Mac, and these copies build up over time. Once you’ve saved anything you still want somewhere safe, you don’t need to keep them. Depending on your Mail settings, you may also be able to limit or remove downloaded attachments without tracking them down by hand.

Old device backups

If you used your Mac to back up an old iPhone or iPad, those backup files may still be taking up space on your drive. Because phone backups are so large, deleting them is one of the quickest ways to recover a lot of space.

Hidden files you should not delete

For every hidden file that is safe to clear out, there are several more that your Mac or your apps actively depend on. Here’s what’s best left alone.

System files and folders

Anything that belongs to macOS rather than a specific user app should be treated as off-limits. Your system relies on these files behind the scenes to handle startup, maintain security, connect to networks, and keep your Mac running. At the top level of your Mac’s drive, one clear folder to leave alone is private, which holds system directories like etc, tmp, and var.

Unknown files in the Library folder

The hidden Library folder contains many important directories, including Application Support, Containers, Preferences, and Group Containers. While some files in these locations may belong to apps you’ve removed, many are still required by the software you use every day.

Don’t delete a file just because the name looks unfamiliar. Software developers often use technical titles for these folders that look nothing like the actual name of the app.

Files tied to apps you still use

Cache files, support files, and preferences tied to apps you actively use are not clutter. They’re pieces of information your apps need to run properly. Removing them can reset your settings, erase your preferences, or cause the app to stop working correctly.

If you’re trying to free up storage, uninstalling an app properly is usually a safer option than manually deleting its hidden files.

Files you found using Terminal

You might come across guides that recommend using Terminal to locate and remove hidden files. While Terminal is a powerful tool, it’s also much less forgiving than Finder.

A single incorrect command can permanently delete files without sending them to the Trash. If you aren’t sure what a command will do, use Finder instead.

How to delete hidden files safely

When you find files you are certain you don’t need, you can remove them in a few careful steps. It’s best to take this in stages so you can undo your changes if you need to:

• Back up your Mac first: Save your current data with Time Machine or another backup method before you start. If you accidentally delete something important, you can bring it back.
• Reveal hidden files in Finder: Use the keyboard shortcut to show the hidden files, then go to the folder you want to look through.
• Review files before deleting them: Look for files you recognize. You can sort folder contents by size or last modified date to get a clearer picture of what’s taking up space or what hasn’t been touched in a long time.
• Move files to Trash: Drag the files to the Trash instead of deleting them permanently right away. If an app stops working properly after you move a file, you can easily put it back.
• Test your Mac before emptying the Trash: Open the apps you use most often to make sure they still run smoothly. If anything seems wrong, you can restore the files from the Trash.
• Empty the Trash and restart: Once you’re sure everything is running fine, go ahead and empty the Trash. If you deleted cache files, restarting your Mac afterward will give it a clean start.

When hidden files can point to a security issue

On their own, hidden files are usually nothing to worry about. However, they deserve a closer look if they appear at the same time your Mac starts acting unusual. For example, take a closer look if:

• You recently downloaded software from an unfamiliar or unofficial source.
• You installed an update that didn’t seem genuine, or an extra app appeared that you didn’t mean to download.
• Your web browser keeps sending you to pages you didn’t ask for, your homepage changed on its own, or you keep seeing unwanted pop-up windows.
• Hidden files keep showing up again after you’ve deleted them, and they aren’t cache files.
• You see apps or background tasks running that you don’t remember installing.

A single issue on this list might be a glitch. But if you are noticing a few of these things happening together, especially after downloading something new, don’t ignore it.

If your Mac started behaving strangely after a suspicious download or unwanted app installation, consider carrying out a malware scan. A scan checks for malicious software that might be changing your hidden files.

Better ways to keep hidden clutter from coming back

You don’t need to delete hidden files regularly to keep your Mac running smoothly. A few adjustments to how you manage your Mac can keep things organized from the start:

• Remove old apps completely: When you want to get rid of an app, use its built-in uninstaller when available or SmartClean in Intego ONE to remove both the app and its leftover files.
• Take a look at your storage from time to time: Opening System Settings > General > Storage shows you what’s taking up space, whether that’s old downloads, apps you forgot about, or large files you no longer need.
• Keep macOS and your apps updated: Software updates often improve how apps manage their own data, reducing the likelihood of outdated or redundant files accumulating in the background.
• Let a dedicated tool do the sorting: If you’re running out of room, a reliable cleanup utility can save you the time and hassle of searching through hidden folders yourself.
• Run a security scan if something feels off: If your Mac starts acting strangely after a new download, a malware scan is a safer first step than guessing which hidden files might be the cause.

Frequently asked questions

How do I show hidden files in Finder on Mac?

Open Finder and press Command + Shift + Period (.). Hidden files and folders will appear right away, usually faded or grayed out compared to regular files. Press the same shortcut again to hide them.

Is it safe to delete hidden files on Mac?

Some hidden files are safe to delete — particularly leftover files from apps you’ve already uninstalled and some cached data. That said, it’s best to leave core system files, data from apps you currently use, and anything unfamiliar exactly where they are.

How do I delete hidden files on Mac using Terminal?

Terminal can remove hidden files with fewer safeguards than Finder, but it’s rarely necessary or wise for everyday tidying. When you delete something here, it skips the Trash completely, so you can’t undo a mistake. Sticking to Finder is almost always the safer way to clean things up.

Why do hidden files come back after I delete them?

Many hidden files are recreated by macOS or your apps as they go about their everyday work. For instance, your Mac will often rebuild its cache files right after a restart. If hidden files keep returning alongside other unusual behavior, such as browser redirects or unwanted pop-ups, it might be worth scanning your Mac for malware.

Can hidden files be malware?

Generally, they aren’t. Most hidden files exist to help macOS or your apps run the way they should. That said, some malware can use hidden files to stay out of sight. If hidden files appear alongside pop-ups, redirects, unknown apps, or other unusual behavior, scan your Mac for malware.

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