Keep Clean - File Master

Review by eFreeware

Keep Clean - File Master is a free Android utility from Beijing Yuexi Qingfeng Culture Media Co., Ltd., and it gathers three jobs that usually live in separate downloads: clearing junk files, organizing what is already on the phone, and reading off device and network statistics. The reason to consider it is the breadth. Rather than installing one app to free space, another to sort photos and a third to check battery temperature, you get a single place to do all of it.

It has passed a million installs and holds a 4.0 average from just over three thousand ratings, which puts it in the busy middle of the storage-cleaner category: popular enough to have a real user base, not so dominant that it is the obvious default. The app was released at the end of December 2025 and last updated in September 2026, so it is still being maintained.

What follows is my read of what the developer describes, section by section, so you can judge whether the mix matches how you actually use your phone.

A toolbox for phones that fill up

The app is built for people who notice storage pressure before they run out of it. If you take a lot of photos, keep screenshots for reference and download documents you forget to delete, the file-management half of this app is the part that will earn its place. The junk scan and the duplicate review address the same problem from two directions: files you never chose to keep, and files you chose to keep twice.

The privacy lock is a different sort of feature, and it will appeal to anyone who hands a phone to someone else. Setting a PIN over selected apps is a simple way to keep messages, banking or photo apps out of reach when a friend is looking something up or a child is playing with the device. It is a lock on the apps you pick, not a vault for the whole phone, and that distinction matters when you decide whether it covers your needs.

The utilities panel is the third audience: people who like numbers. Battery temperature and voltage, network data usage, Wi-Fi security status, connection speed and hardware details such as screen resolution and CPU cores are the sort of readouts that satisfy curiosity and occasionally help when something feels wrong. None of this is unusual on Android, but having it next to the cleaner saves a trip to a second app.

Clearing junk without hunting for it

The cleaning side scans for the categories that quietly consume space: app cache, system cache, ad cache and residual files left behind by apps you may no longer use. It also picks up obsolete APK files, the installers that linger after an app has been set up. Those are the files most people never see in a normal file browser, which is exactly why they accumulate.

The appeal is the sweep rather than the individual deletion. You are not asked to know which folder holds what; the app sorts the candidates by type and you decide what goes. That said, cache clearing is a maintenance chore rather than a one-time fix, and the space it recovers tends to come back as apps run. Treat it as something to revisit periodically.

I would expect this to be most useful on a phone that has been in service for a year or two, where the leftovers have had time to build up. On a new device with plenty of free space, the gains will be modest.

Photos, screenshots and the files you forgot

The file manager covers more ground than a simple browser. Photos get a review pass, and the app groups similar shots together, which is the practical way to deal with burst photos and near-identical images you meant to sort months ago. Screenshots get their own review, useful given how quickly they pile up after a stretch of online shopping or travel planning.

One feature stands out from the usual cleanup list: removing location data from photos. If you share images publicly or send them to people you do not know well, stripping the EXIF location before they leave your phone is a sensible habit, and having it built into the gallery review means you can do it while you are already deciding what to keep.

Beyond images, the app handles video and audio files, documents, and the two categories that cause the most storage regret: large files and duplicates. Reviewing those by size or by repetition is a quicker route to freeing several gigabytes than deleting individual photos ever is. The developer pitches the whole set as a clearer way to organize storage, and the grouping is what makes that plausible.

Usage stats, battery readings and network checks

The utilities section reports how often apps are opened and how long they are used, alongside device details such as screen resolution and processor core count. For anyone trying to cut down on a particular app, seeing the open count in plain numbers is more persuasive than a vague sense of having used it too much.

Battery temperature and voltage are the readouts I would check first when a phone feels warm or drains faster than usual. They are raw figures rather than advice, so they tell you something is off without telling you why, but that is often enough to prompt a restart or a look at what has been running.

The network tools round it out: data usage statistics, a Wi-Fi security status scan and a speed measurement. The security scan is the one worth understanding before you rely on it, since it reports on the Wi-Fi connection you are using rather than on the apps on your phone. Together these turn the app into a general diagnostic panel as much as a cleaner.

Free, with advertising

Keep Clean is free to download. There are no in-app purchases, so nothing inside the app is held back behind a payment and there is no subscription to weigh.

Whether that bothers you depends on how often you plan to open it; a weekly tidy-up is a different experience from daily maintenance.

Since the app is free and carries no purchases, there is no financial risk in trying it.

How it compares with the alternatives

The obvious comparison is with the storage tools already on your phone. What they generally do not offer is the combination of a PIN lock, EXIF removal and a diagnostic panel in one place, which is where this app makes its case.

The second comparison is with dedicated single-purpose apps: a photo organizer, a privacy locker, a network analyzer. Each of those will typically go deeper in its own area than a combined tool can. If you only ever sort photos, a focused app may serve you better; if you want one icon that covers several small jobs, the all-in-one approach is the point.

The other comparison is with paid cleaners that promise more thorough sweeps. Given that it covers cache, leftovers, duplicates and large files, it covers the ground most people actually need.

A tidy-up tool worth having on a full phone

The breadth is the selling point, and the free model keeps the decision simple.

It will suit people whose phones have accumulated clutter and who would rather work through categories than hunt folder by folder. It will suit anyone who hands their phone to other people and wants a light layer of protection over specific apps. And it will suit the curious, who like having battery temperature and data usage a tap away.

The main caveat is that cleaning is a recurring chore rather than a permanent fix. For a free utility with a 4.0 average across more than three thousand ratings, that seems a fair exchange.