How to find junk files on Android and clear memory

Slow smartphone operation, constant notifications about lack of space and sudden application freezes are familiar symptoms for most users Android. The cause of these problems is often invisible data that accumulates over months or even years.

This data is called junk files, and it can take up gigabytes of precious space in the internal memory. Fortunately, finding and deleting them is not difficult if you know where to look and what tools to use.

In this article we will analyze all the available cleaning methods: from built-in system tools to advanced methods for analyzing folders. You will learn to distinguish useful system data from useless junk that can be safely deleted without the risk of damaging the device.

What are junk files and why do they appear

Junk files are temporary data that is created by the operating system and applications during operation. For example, when you browse the web, the browser stores copies of images and scripts in cacheso that the site loads faster the next time you visit.

Over time, this cache grows, turning into ballast that no longer provides any benefit, but takes up space. Messengers, social networks and games behave similarly, leaving behind error logs, temporary thumbnails and remnants of deleted updates.

Users often confuse junk files with personal data. It is important to understand the difference: photos, documents and downloaded music are your files. But files with the extension .tmp, empty folders or duplicate installation packages .apk are candidates for deletion.

⚠️ Attention: Never delete files from system folders if you are not 100% sure of their purpose. Removing critical libraries may cause the smartphone to stop booting.

Using built-in Android cleaning tools

Modern versions Android (starting from 6.0 and higher) already have built-in mechanisms for servicing the device. Manufacturers often add their own wrappers, such as MIUI, OneUI or ColorOS, which include powerful memory analysis tools.

To use the standard cleaner, go to Settings → Memory or Settings → Device maintenance. The system will automatically scan the drive and offer to delete unnecessary data. This is the safest method for beginners.

However, built-in utilities often act superficially. They clear the cache of recent applications, but may miss deep system logs or files from long-deleted apps. A more thorough check will require additional steps.

Manual search through a file manager

For those who want to take control into their own hands, the best way is to use an advanced file manager. Standard Explorer may not display hidden folders, so it is recommended to install an application like Total Commander or Solid Explorer.

You need to enable the display of hidden files in the Explorer settings. Usually this is a checkbox in the "Show hidden files" menu. After this, you will be able to see folders starting with a dot, for example .thumbnails.

Here are the main directories that are worth checking manually:

• 📂 /DCIM/.thumbnails — thumbnails of your gallery are stored here, which can occupy hundreds of megabytes.
• 📂 /Android/data — folders with application data. Here you can delete only those directories that belong to already deleted games or apps.
• 📂 /Download —the downloads folder, where old installers and documents that you have already opened often accumulate.

Be extremely careful when cleaning the folder /Android/obb. Cache files of heavy games (textures, maps, sounds) are stored there. If you delete the contents of this folder for an installed game, it will stop launching and will require you to download the data again.

Storage analysis using third-party utilities

If a manual search seems too difficult, specialized analyzer applications will come to the rescue. They visualize locations, showing a visual map of your storage facility. One of the best tools is Files by Google or DiskUsage.

These applications scan your memory and sort files by size. You will immediately see the “heaviest” objects. It often turns out that space is taken up by forgotten video files or backup copies of chats in WhatsApp.

Application	Main function	Need Root	Security
Files by Google	Smart cleaning and search for duplicates	No	High
SD Maid	Deep cleaning of system garbage	Desirable	High
DiskUsage	Visualization of occupied space	No	Medium
Clean Master	Aggressive cache cleaning	No	Low (lots of advertising)

Use such utilities wisely. Avoid "memory boosters" that promise a miracle effect. Their work often comes down to forcibly stopping processes, which the system will immediately start again, only using up battery power.

Clearing the cache of specific applications

Sometimes the problem is not system garbage, but one specific application that has gotten out of control. Social networks and instant messengers are the main culprits of memory overflow. They save every photo and video viewed.

To solve this problem point-by-point, go to Settings → Applications. Select the leading application in terms of space consumption (for example, Telegram or Instagram). Click on Storage.

Here you will see two buttons: "Clear cache" and "Clear data". The first one deletes temporary files and is safe. The second resets the application to factory settings, deleting logins and correspondence.

⚠️ Attention: The "Clear data" button will delete all your authorization in the application. Use it only if you are ready to re-enter your login and password.

Some messengers, such as Telegram, have a built-in setting to automatically clear the cache. Go to the settings of the application itself, section Data and memory, and set a limit, for example, 500 MB. The application itself will delete old files when the limit is exceeded.

Advanced methods: ADB and hidden menus

For For experienced users who are not afraid of the command line, there is a tool ADB (Android Debug Bridge). It allows you to manage your smartphone's file system from your computer, gaining access to areas hidden from regular applications.

To work, you will need to enable USB debugging in the menu For developers and connect the phone to the PC. Using the command adb shell pm list packages you can get a list of all packages and find those that are no longer used.

adb shell dumpsys package | grep -A 5"codePath"

This command will show the paths to the code of installed applications, helping to identify the remains of remote software. However, using ADB requires high qualifications. An error in one letter of the command can lead to the removal of a system component.

How to enter the developer menu?

Go to Settings → About phone. Find "Build Number" and quickly click on it 7 times in a row. The system will inform you that you have become a developer.

Remember that interfaces and menu item names may differ depending on the version Android and shell of the manufacturer. If you do not find an exact match with the instructions, look for similar sections in the settings of your device.

Preventing memory clogging

The best way to deal with garbage is to prevent its accumulation. Set a rule: check the folder once a month Download and delete old files. Disable autosaving of media files from instant messengers to the gallery.

Use cloud storage services such as Google Photos or Yandex.Diskto back up your photos. After successful downloading, enable the "Free up space" function, which will delete local copies of pictures.

Keep an eye on application updates. Developers often optimize the code and reduce the cache size in new versions. Outdated versions of apps may not work correctly and generate more errors.

⚠️ Attention: Do not install several cleaner applications at the same time. They may conflict with each other, trying to delete the same files, which will lead to errors in the system.

Frequently asked questions (FAQ)

Is it safe to delete the .thumbnails folder?

Yes, it's safe. This folder stores only photo thumbnails. The next time you open the gallery, the system will create them again, but this will take time and some processor resources.

Why does the space quickly run out again after cleaning?

Most likely, you have autosave activated in messengers or some application is constantly writing error logs. Check the settings of Telegram and WhatsApp, and also remove the problematic application.

Do you need Root to completely clean up garbage?

For most tasks, Root is not needed. The built-in tools and rights of an ordinary user are enough to clean up 90% of the garbage. Root is only required to remove the manufacturer's system applications (bloatware).

Is it possible to delete the Android folder completely?

No, you cannot delete the entire folder Android . This will break all installed applications. You can delete only the contents of specific subfolders inside data and obbthat belong to deleted apps.