How to lock the Photos app on a Mac
Short answer: macOS still has no built-in way to lock a single app, and Photos is no exception. Apple’s own position in its Support Communities is direct — "It is not possible to lock apps individually." For Photos, that means years of camera roll sit one click away from anyone holding your unlocked Mac.
Why people want to lock Photos
Photos syncs your entire library across every Apple device on the same Apple ID — screenshots, ID scans, kids' photos, and whatever else has ended up in your camera roll over the years. Handing someone your Mac for something unrelated means handing them a scrollable history of all of it, not just the one photo you meant to show.What doesn’t work
The Hidden album feels like a fix but isn’t one — it only filters photos out of the main grid inside the Photos app; anyone who knows to check View → Show Hidden Album (or the equivalent in the sidebar) sees everything anyway, and copies sit in Recently Deleted for another 30 days regardless. A second user account means logging out first just to hand someone the Mac. FileVault only protects your library while the disk is powered off — once you’re logged in, it does nothing.One honest limitation
Even with Photos locked, Spotlight search can still surface thumbnails from your library — macOS indexes images for search independently of whether the Photos app itself is open. This is a macOS-level behavior, not something any app locker, including Shoo!, can override. If that’s a dealbreaker, go to System Settings → Siri & Spotlight → Search Privacy and remove Photos & Videos from what Spotlight is allowed to search.What actually works
Shoo! locks Photos by ending its process the moment you lock it, not by drawing an overlay on top or checking a password only when it first opens. There’s nothing left running to switch back to, and it only reopens after Touch ID (or Apple Watch, or a private backup password) succeeds.Try it free for 7 days — full functionality, no credit card, $17.99 once if you keep it.
Frequently asked
Can I lock just the Photos app on a Mac?
Yes — Shoo! lets you lock Photos specifically without touching anything else on your Mac. Ending its process is what makes the lock airtight rather than an overlay someone could click through.
Does the Hidden album keep my photos private?
No — Hidden only filters photos out of the default grid inside the Photos app itself. Anyone who opens View → Show Hidden Album sees them, and copies remain in Recently Deleted for 30 days regardless.
Will Spotlight still show my photos if Photos is locked?
It can — Spotlight indexes your Photos library for search independently of the app being open or locked. Turn off Photos & Videos under System Settings → Siri & Spotlight → Search Privacy to close that gap.
Can I open Photos with Touch ID after locking it with Shoo!?
Yes. Once Photos is locked it only opens after Touch ID succeeds. If your Mac has no Touch ID, you can confirm with Apple Watch (double-press the side button) or a private backup password that is separate from your Mac login password.
Is Photos still protected if I switch desktops or come back to it later?
Yes. Shoo! does not draw an overlay or check only at launch. It ends the Photos process when locked, so switching Spaces or returning to the app later can't show what was on screen. It reopens only after you verify.