

Quick Summary
If you sideload apps from third-party sources on your Android device, you might encounter additional steps to get them to install.
This is because Google is no longer distributing fat APKs, offering App Bundles instead.
One of the satisfying things about Android has always been the ability to (more or less) do what you want with it.
Although Google requires you to toggle a setting to allow you to install apps from sources outside of Google Play, it has been a simple process for a number of years. But there's a change taking place that might make it a little more complicated.
Being able to use apps that originate from outside Google Play has a number of advantages – it gives you freedom to install different versions of an app, it allows you to test apps (or app versions) that haven't yet been released, or even develop your own.
It also means that if you don't have a Google-certified device, or you want to use an Android app on a device it's not built for, there are routes to accessing apps if they are not available on Google Play.
That side of things isn't changing, you'll still be able to do this, but how Google is handling some apps is changing. According to Artem Russakovskii who runs APKMirror (via 9to5Google), Google has stopped producing "fat APKs" and is instead only making app bundles available.
A fat APK contains all the information for all versions of an app, making it really easy to install. You just download it on your device and run it like an executable file on Windows. The app installs and away you go. The downside of a fat APK is that it potentially contains a lot of data your device doesn't need, which just takes up storage space.
Google introduced a new method for app distribution when it announced Android App Bundles. This moved that APK generation over to Google Play, so when you download an app, you get the version you need for your device. This is where the change is happening, as Google was also offering the fat APK, which is what sites like APKMirror would then offer, so you could easily install the app.
Sign up to the T3 newsletter for smarter living straight to your inbox
Get all the latest news, reviews, deals and buying guides on gorgeous tech, home and active products from the T3 experts
Now those fat APKs aren't available and Google only seems to be offering App Bundles, it means you'll need a separate installer to use them. That's not the end of the world, it just makes a previously easy process a little more complicated, but separate software, such as the APKMirror installer, can still take the App Bundle and get it installed on your device.
For those less inclined to tinker and who only ever install apps from Google Play, there's no change here, everything will remain exactly as it was.
Developers also still have the option to produce a fat APK themselves for distribution, so some apps you download outside Google Play will work – but some you want to source from third-party sources, might now require an additional step to install.
Chris has been writing about consumer tech for over 15 years. Formerly the Editor-in-Chief of Pocket-lint, he's covered just about every product launched, witnessed the birth of Android, the evolution of 5G, and the drive towards electric cars. You name it and Chris has written about it, driven it or reviewed it. Now working as a freelance technology expert, Chris' experience sees him covering all aspects of smartphones, smart homes and anything else connected. Chris has been published in titles as diverse as Computer Active and Autocar, and regularly appears on BBC News, BBC Radio, Sky, Monocle and Times Radio. He was once even on The Apprentice... but we don't talk about that.
-
Eve’s smart plug gets impressive Matter upgrades – but I’m most excited about the app
Eve Energy adds Matter support and an updated Android app
By Bethan Girdler-Maslen
-
Audio-Technica’s latest luxury turntable will light up your life, and your records
This strictly limited turntable is a feast for the eyes as well as the ears
By Carrie Marshall
-
New Google Messages feature will make millions very happy
It's going to end a serious messaging blight
By Sam Cross
-
In an age of exciting upgrades, Google could downgrade the Pixel 10 instead
There’s a change coming to the Pixel cameras and it could cause a stir
By Chris Hall
-
Google Pixel 10 Pro Fold renders show an early contender for foldable of the year
Even though it might not be the slimmest, it could be the sexiest
By Britta O'Boyle
-
Google TV set for a shake up that might have you feeling blue
A redesign is reportedly coming to Google TV, with a new colour scheme and features
By Rik Henderson
-
Android 16 to come with a significant security upgrade for Pixel phones
It’s going to be easier to unlock your Pixel phone in the future
By Chris Hall
-
Google Pixel 9a delayed, but for good reason
Google’s latest affordable phone has been announced, but you can’t actually buy it yet
By Chris Hall
-
Google's Pixel 9a does one simple thing that could tempt me away from iPhones after a decade
Google's played a blinder here
By Max Freeman-Mills
-
Google's new phone makes one huge, unexpected change
The Pixel 9a is flat – that's big!
By Max Freeman-Mills