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Third-party apps and extensions expand your editing options in Photos for iOS and macOS. You can apply edits from multiple apps and extensions to one photo, or use any combination of apps and extensions plus the editing tools built into Photos.
MacMost forum question: How Do I Allow 3rd Party App Installation? I am trying to install a 3rd party app, but when I try to run it, I always get the message: The developer cannot be checked. App-specific passwords are set to become a mandatory requirement for third-party apps that access iCloud user data, according to an Apple Support email sent out today. Using the Terminal is the best way to allow installation of applications on your Mac without the tedious process involved in making exceptions for each one of them. Using this method, you can install and use applications as you wish regardless of their source. Opening apps from unidentified developers are not for everyone.
Use third-party extensions on your iPhone, iPad, or iPod touch
Learn how to find apps with Photos extensions for your iOS device, turn on the extensions, and then use them to edit photos.
Install iOS apps that offer extensions
Use the App Store on your device to find and install apps that allow full editing from Photos or include extensions for Photos. Apps that include Photos extensions often say so in their descriptions; search for terms like 'Photos extension' to explore more apps.
You can also choose from the apps listed in Edit Images Faster With Photo Extensions on the App Store.
Turn on extensions on your iOS device
After you install apps that include Photos extensions on your iPhone, iPad, or iPod touch, turn the extensions on:
- Open the Photos app, then tap a photo.
- Tap Edit, and then tap .
- In the menu that appears, swipe to the left until you see the More button, and then tap it.
- You see your apps that include Photos extensions. You can turn them on or off, or drag them up or down to change their order. When you’re finished, tap Done.
Edit photos with extensions on your iOS device
- Open the Photos app, then tap a photo.
- Tap Edit, then tap .
- Select an app from the menu that appears.
- Edit the photo with the extension's tools.
- When you're satisfied with your edits, click Done. You can choose another extension to apply more edits to the photo, or use any of the editing tools that are built into Photos.
- If you're finished with all edits, click Done to exit the edit mode.
Use third-party extensions on your Mac
Learn how to find apps with Photos extensions for your Mac, turn on the extensions, and then use them to edit photos.
Install Mac apps that allow editing or offer extensions
Photos for macOS makes finding third-party apps easy:
- Double-click a photo in your library to open it in single view, then click Edit.
- Click , then choose App Store.
The Mac App Store opens to a selection of third-party photo editing apps that are compatible with Photos.
You can also choose from the apps listed in Extensions for Fast Photo Edits on the App Store.
Turn on extensions on your Mac
After you install apps that include Photos extensions on your Mac, turn the extensions on:
- Choose Apple () menu > System Preferences, then click Extensions.
- Click Photos Editing in the left sidebar. Your apps that include Photos extensions appear.
- Turn on the extensions that you want to use in Photos. You can also drag them up or down to adjust the order that they appear in Photos.
Edit photos with extensions on your Mac
- Double-click a photo in your library to open it in single view, then click Edit.
- Click .
- Choose an app from the menu that appears.
- Edit the photo with the extension's tools that appear.
- When you're satisfied with your edits, click Save Changes. You can choose another extension to apply more edits to the photo, or use any of the editing tools that are built into Photos.
- If you're finished with all edits, click Done to exit the edit mode.
Edit photos within third-party apps on your Mac
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With Photos for macOS High Sierra and later, you can send a photo to most third-party photo apps for editing, then save the changes right back into your library.
- Control-click a photo and choose Edit With from the contextual menu. Then choose from the list of third-party editing apps on your Mac. You can also click a photo and then choose Image > Edit With in the menu bar.
- The photo opens in the third-party app that you chose. Make your edits, and then save.
If the app saves photos in a non-standard format, look for an option to save as JPEG or another format that Photos supports.
Your edited photo appears automatically in Photos.
Learn more
- When you edit a photo with third-party extensions or the built-in tools that Photos offers, you can always start over with the original photo. Open the photo in edit mode, then click Revert to Original on your Mac or tap Revert if you're using an iOS device.
- If you use iCloud Photos, remember that it keeps your photos organized and up to date everywhere that you use the same Apple ID. So any edits that you make on one device appear on your other devices too.
Mac has the security settings to allow apps from the App Store and identified developers. When you downloaded an app from the internet or an unknown source other than App Store your Mac may warn you. The first time you launch a third-party app from an identified developer, your Mac asks if you’re sure you want to open it. When you try to install an app that isn’t registered with Apple by an identified developer, or install third-party apps from unidentified developers, you can refer to this guide to install apps from unidentified developers on Mac.
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Sometimes Apple may tell you the app is damaged and can’t be opened, you should eject the disk image
This message doesn’t necessarily mean that something is wrong with the app. Sometimes the error message may be incorrect. You can try to allow applications downloaded from anywhere from the system security setting see if you can get rid of the error message.
Access Mac System Preferences, click Security & Privacy > General. Click the lock icon at the bottom-left and enter your password to make changes. Select Anywhere under the header “Allow apps downloaded from.” Enter your password again when prompted. Try to install the app again see if any help.
Can’t find Anywhere under Allow apps downloaded from?
The “Allow applications downloaded from anywhere” option is hidden by default in Gatekeeper since Mac Sierra. Mac does not users to allow all apps to keep their computer safe. Advanced Mac users can reinstate the Anywhere option in Gatekeeper from Terminal.
Open Launchpad on Mac. Select and launch Terminal. Then type in the following command:
sudo spctl --master-disable
, Press Enter or Return on your keyboard. You will be prompted to enter your Mac password. Type in your password and press the Enter or Return on your keyboard again.
Allow Third Party Apps To Installed In Mac Download
Go to System Preferences > Security & Privacy > General again, this time you should see the Anywhere option in the Allow apps downloaded from section. You can enable it to allow all apps or allow third-party apps downloaded from anywhere from there.
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You can also reverse this and go back to the default strict Gatekeeper settings. Also in the Terminal windows, enter and execute the following command string:
Allow Third Party Apps To Installed In Mac Catalina
sudo spctl --master-enable
.