What an APK file is and why you might have one
An APK file is the installation package for Android apps — the same format Google Play Store uses behind the scenes. When you download an app from Google Play, your phone automatically opens the APK and installs it. But sometimes you'll download an APK directly from a website or email instead, and your phone won't know what to do with it. Opening it requires a few extra steps, but the process is straightforward once you know where to look.
You might have an APK file because a developer sent it to you directly, you downloaded it from a website outside Google Play, or you're testing a beta version of an app. Whatever the reason, your Android phone can open it — you just need to tell your phone it's allowed to, then find the file and tap it.
Key Takeaways
- Android phones block APK installation from unknown sources by default, so you must turn on "Install from Unknown Sources" in your phone's settings first.
- The exact location of this setting varies by phone brand and Android version, but it's always under Settings, usually under Security or Apps.
- Once you've turned on unknown sources, find your APK file in your phone's file manager and tap it to start installation.
- You can turn the setting back off after installation if you want to return to the default security level.
Turn on installation from unknown sources
Your phone blocks APK installation by default to protect you from malicious files. Before you can open an APK, you need to tell your phone to allow it. The steps differ slightly depending on your phone brand and Android version, but the setting is always in your phone's main Settings app.
For Samsung phones: Open Settings, tap Apps, then tap the three dots in the top right corner and select "Special access." Tap "Install unknown apps," then select your file manager from the list and toggle it on. This tells your phone to allow APK files opened through the file manager.
For Google Pixel and most other Android phones: Open Settings, tap Security and privacy (or just Security), then scroll down and tap "Install unknown apps." Select your file manager and toggle it on.
For older Android versions: Open Settings, tap Security, and look for a checkbox labeled "Unknown sources." Tap it to turn it on. You'll see a warning — this is normal. Tap OK to confirm.
Once you've turned this on, leave it on for now. You'll use your file manager to find and open the APK, and the file manager needs this permission to work.
Find your APK file using the file manager
Your APK file is sitting somewhere on your phone — usually in your Downloads folder if you downloaded it from a website or email. You need to find it using your phone's file manager app, which comes built into every Android phone.
Open your file manager app. It's usually called Files, My Files, File Manager, or just Files — look for an icon that looks like a folder. Once it opens, navigate to your Downloads folder. This is where most APK files end up. If you don't see your APK there, check your email attachments or ask whoever sent it to you where they put it.
Scroll through the Downloads folder until you find your APK file. It will have a name ending in ".apk" — for example, "Instagram.apk" or "TikTok.apk". Tap and hold the file name to select it, or just tap it once to open it directly.
Install the APK by tapping it
Once you've found your APK file, installation is simple: just tap it. Your phone will show an installation screen with information about the app and the permissions it needs. Read through the permissions to make sure they make sense for the app — for example, a camera app should ask for camera permission, but a calculator app should not.
If the permissions look reasonable, tap the Install button. Your phone will unpack the APK and install the app. This usually takes 10 to 30 seconds. You'll see a progress bar, and when it finishes, you'll see an "Open" button. You can tap it to launch the app right away, or tap "Done" to install it without opening it yet.
The app is now installed on your phone just like any app from Google Play. You'll find it in your app drawer with your other apps, and you can uninstall it the same way you'd uninstall any other app.
What to do if the installation fails
If you tap the APK and nothing happens, or you see an error message, the most common cause is that you didn't actually turn on "Install from Unknown Sources" for your file manager. Go back to Settings and double-check that the toggle is on. Some phones require you to restart the file manager after changing this setting, so close it completely and open it again.
If you see an error that says "App not installed" or "Parse error," the APK file itself may be corrupted or incomplete. This usually means the download didn't finish properly. Try downloading the APK again from the same source, or ask the person who sent it to you to send it again.
If you see a message about your phone's Android version, the app requires a newer version of Android than your phone has. You can't install it unless you update your phone's operating system. Check your phone's Settings under About Phone to see your current Android version, and look for a system update option.
Turn off unknown sources after installation (optional)
Once your APK is installed, you can turn off "Install from Unknown Sources" if you want to return your phone to its default security setting. This is optional — leaving it on won't hurt anything, but turning it off means your phone will block APK files again if you accidentally try to open one.
To turn it off, go back to the same Settings location where you turned it on. For Samsung phones, go to Settings > Apps > Special access > Install unknown apps, select your file manager, and toggle it off. For Pixel and most other phones, go to Settings > Security and privacy > Install unknown apps, select your file manager, and toggle it off. For older Android versions, go to Settings > Security and uncheck "Unknown sources."
Frequently Asked Questions
Is it safe to install APK files from the internet?
APK files from trusted sources are safe, but files from unknown websites can contain malware. Only download APKs directly from the app developer's official website, from people you trust, or from well-known app repositories. If you're not sure about the source, don't install it.
Can I install an APK on an iPhone?
No. iPhones run iOS, not Android, and they don't support APK files. APK files only work on Android phones. If you need an app on an iPhone, look for it in the Apple App Store instead.
What's the difference between installing from Google Play and installing an APK?
Both methods install the same app, but Google Play handles updates automatically and verifies that apps are safe before listing them. When you install an APK directly, you're responsible for getting updates yourself, and Google hasn't checked the file. This is why APK installation is turned off by default.
Will the app update automatically if I install it from an APK?
Not usually. Apps installed from APK files don't receive automatic updates the way Google Play apps do. You'll need to manually download and install new versions when the developer releases them. Some apps have a built-in update checker, but most don't.
Can I delete the APK file after installation?
Yes. Once the app is installed, the APK file is no longer needed. You can delete it from your Downloads folder or wherever it was stored. The app itself will remain installed on your phone.