How to Share Files Safely Between Mac User Accounts

When several people share one Mac, each person has their own account, their own home folder, and their own private files. That privacy is a good thing, but it raises a practical question. How do you hand a photo, a school project, or a household spreadsheet to someone else on the same computer without emailing it to yourself or leaving private folders wide open?

macOS already includes safe places and simple tools for exactly this job. The Shared folder is visible to every account on the Mac, each home folder has a Public folder and a Drop Box for receiving files, and permissions let you control who can read or change what you share. This guide shows how to use each option safely.

Quick Answer

To share a file with every account on the Mac, copy it into the Shared folder inside the Users folder on your startup disk. To share with one person, place the file in their Public folder, or ask them to drop files for you into your Drop Box. Copy files rather than moving your only original, and never change permissions on your whole home folder.

How Mac Accounts Keep Files Separate

Every account has a home folder with Desktop, Documents, Downloads, and Pictures. By default, other Standard users cannot open your home folder at all, and see a red no-entry sign if they try.

That default protection is the foundation of safe sharing. Instead of weakening it, macOS gives you three areas that are designed for exchange. The Shared folder belongs to no single user and is open to all accounts on the machine. The Public folder inside your home folder can be read by other users, so it works like a display shelf for files you choose to offer. The Drop Box inside your Public folder works the opposite way: other users can place files into it but cannot see what is inside, like a letterbox.

Use Shared for family files everyone needs, Public for files one person offers to the rest, and Drop Box when someone needs to give you a file without seeing your other received files.

How to Share Files Using the Shared Folder

The Shared folder is the simplest and best choice for most families. A household budget, a folder of holiday photos, or a set of school forms can live there and be opened by mum, dad, and the children from their own accounts.

1. Open Finder and, from the Go menu at the top of the screen, choose Computer, then open your startup disk. On many Macs it is called Macintosh HD.
2. Open the Users folder. Inside it you will see a folder for each account, plus one called Shared.
3. Open Shared and copy your file or folder into it. Drag it in while holding the Option key to copy it, or copy and paste it with Command and C, then Command and V.
4. Tell the other person the file is ready. They sign in to their own account, open the same Users and then Shared folder, and open or copy the file from there.

Copy rather than move whenever the file matters, so your original stays safe in your Documents folder if someone edits or deletes the shared version. If someone can open a file in Shared but cannot save changes, they should copy it to their own home folder, edit that copy, and place the finished version back in Shared with a clear new name or date.

How to Share With One Person Using Public and Drop Box

Sometimes you do not want a file in front of the whole household. The Public folder and Drop Box handle person-to-person sharing on the same Mac, and Apple describes this layout in its guide to sharing files with others who use your Mac.

Giving a File to Someone Else

1. Open Finder, choose Go, then Home to open your home folder, and confirm the file you want to offer is copied into your Public folder.
2. The other person signs in, opens the Users folder, opens your home folder, and opens your Public folder.
3. They can read and copy anything in Public, but they cannot change or delete the originals there.

Receiving a File From Someone Else

1. Ask the other person to open the Users folder, then your home folder, then your Public folder.
2. Inside Public they will find a folder called Drop Box. They drag the file onto it and confirm when macOS tells them they will not be able to see the file after dropping it.
3. When you sign in, open your Public folder and then Drop Box. The file is waiting there, and only you can open the folder to see it.

The Drop Box feels strange at first, because the sender cannot confirm the file landed. That is deliberate, like a sealed envelope through a letterbox. Tell the sender afterwards that it arrived. Pair this with our walkthrough on adding a new user account on a Mac for a family member, so everyone has the right account type first.

Checking and Changing Permissions Safely

Every file and folder on a Mac has permissions that say who can read it, who can change it, and who cannot open it at all. You rarely need to touch them, because Shared, Public, and Drop Box are already set up correctly. When you do need to check, use the Get Info window.

1. Select the file or folder in Finder and press Command and I, or right-click it and choose Get Info.
2. Scroll to Sharing and Permissions at the bottom of the window.
3. Read the list. You will usually see your name with Read and Write, staff with Read only or Read and Write, and everyone with Read only or No Access.
4. If you must change an entry, click the padlock, enter your administrator password, and choose the new setting for that user or group only.

Follow one golden rule: only change permissions on the specific item you mean to share. Never set your whole home folder or disk to Read and Write for everyone, which would expose every private file. Apple sets out the safe approach in its page on changing permissions for files, folders, or disks on a Mac. If you share a folder regularly with one person, add that person by name instead of opening it to everyone.

Sharing Over Your Home Network Instead

If the other person uses a different computer, macOS File Sharing lets another Mac, or a Windows computer on your home Wi-Fi, connect to chosen folders with a username and password. Turn it on in System Settings, under General, then Sharing, add only the folders you intend to share, and never share your administrator password. Turn it off on public Wi-Fi. For a one-off transfer nearby, AirDrop is simpler and leaves nothing in a shared place afterwards.

Common Mistakes and Useful Tips

The most dangerous mistake is dragging your only copy of an important file into a shared place and letting others edit it freely. Always keep your master copy in your own home folder, share a copy, and treat the shared version as the working version only when everyone understands the plan.

Another mistake is fixing a sharing problem by opening permissions on everything. If a file will not open for another user, moving a copy into Shared usually solves it safely, with no permission changes at all.

Do not share your password so someone can sign in as you to grab a file. That gives them access to your messages, email, and photos too. Use the folders in this guide instead.

Useful tips: use dated folder names in Shared, such as Holiday Photos Final, so nobody edits an old version. Empty old files from Shared and Drop Box every few months, because shared areas quietly fill the disk. If a child shares the Mac, review what sits in Shared together, since everything there is visible to their account too.

Conclusion

Sharing files between Mac accounts does not require weakening privacy or handing over passwords. The Shared folder covers family files, Public lets you offer files to others, and Drop Box lets others deliver files to you privately. Copy files instead of moving originals, and change permissions only on single items when you must.

Frequently Asked Questions

Where is the Shared folder on a Mac?

Open Finder, choose Computer from the Go menu, open your startup disk, and then open the Users folder. The Shared folder sits alongside the home folders for each account. Every user on the Mac can open it and read the files placed inside.

Can other users delete files I put in the Shared folder?

It depends on the permissions of each file, but you should assume shared files are less protected than files in your own home folder. Keep your only original copy in your own Documents folder, and treat the copy in Shared as the version others may open, copy, or edit.

Why can someone drop a file in my Drop Box but not see it afterwards?

That is by design. The Drop Box allows writing but not reading, so people can deliver files to you without seeing files that others have given you. Only you, the owner of the home folder, can open the Drop Box and view everything inside it.

Is it safe to change permissions on my home folder to share everything?

No. Changing your whole home folder to give everyone access exposes your documents, downloads, and other private data to every account on the Mac. Share individual files through Shared or Public instead, and only adjust permissions on the specific item you intend to share.

What is the safest way to share a sensitive document on a family Mac?

Hand it over in a one-off way, for example with AirDrop or a USB drive, rather than leaving it in a shared folder. If you must use a folder, place it in a folder shared only with that named person, check the permissions in Get Info, and remove the copy as soon as they have taken theirs.