Every smartphone owner sooner or later faces a situation when the device starts to work slower, and notifications about low memory appear more and more often. This is an inevitable process of accumulation of digital “junk”, which consists of application cache, residual files of uninstalled apps and forgotten downloads. Many users immediately rush to install specialized cleaning utilities, which often themselves become a source of advertising and unnecessary load on the system.
In fact, the operating system Android has all the necessary tools for self-service without installing additional software. Manual cleaning is not only more effective because you control what is deleted, but it is also safer for your personal data. In this article, we will look in detail at how to find and delete unnecessary files manually, returning your gadget to its former performance.
Storage analysis: finding the main space eaters
Before you start deleting, you need to understand what exactly is taking up precious gigabytes. Modern Android shells provide built-in analyzers that visualize the distribution of data. Go to Settings and find the item Storage or Memory. Here you will see a color chart where applications, images, videos and system files are indicated in different colors.
Pay special attention to the “Applications” section. It often happens that messengers like Telegram or Viber take up tens of gigabytes due to automatically saved media files. Application cache is temporary data that speeds up the work of apps, but over time grows to exorbitant sizes. Deleting them will not lead to the loss of logins or passwords, but will instantly free up space.
System files and so on can also take up a significant amount of space. Sometimes this is correct data, and sometimes it is calculation errors or “dead” files after unsuccessful updates. If the share of “Other” exceeds 20-30% of the total memory, it is worth conducting a deep audit of the folders manually through the file manager.
⚠️ Attention: Do not delete files from system folders whose purpose you do not know. This can lead to unstable operation of the operating system or loss of important settings.
Clearing the cache and application data manually
The most effective way to free up space is targeted cleaning of specific apps. Unlike automatic cleaners, which can remove the excess, the manual method allows you to select only what you really need to clean. Go to the menu Settings → Applications and sort the list by the size of the space occupied.
Select a leading application, for example, a social network or browser. Inside the application card you will find two important buttons: “Clear cache” and “Clear data”. Clearing the cache is safe and deletes temporary files (pictures, scripts) that were downloaded again the next time you start it. Clearing data is a more radical measure that resets the application to the “as after installation” state, deleting logins, settings and local databases.
Use clearing data only for those apps where you remember your password or which you are ready to set up again. For browsers, this means deleting history and saved forms, but the release can be several gigabytes. For games, clearing data may require re-downloading resources, so here it is better to limit yourself to only the cache.
☑️ Application cleaning algorithm
Repeat this procedure for the top 5 largest applications. Typically this is enough to free up 3 to 10 GB of free space without losing important photos or documents.
Working with the Downloads folder and file system
The (Downloads) folder is the most popular place for digital waste to accumulate. Installer APK files, open documents from mail, pictures from browsers, and forgotten files are automatically saved here. Open a standard file manager (for example Download (Downloads) are the most popular place for digital waste to accumulate. Installer APK files, open documents from mail, pictures from browsers, and forgotten files are automatically saved here. Open a standard file manager (for example, Files by Google or “My Files” on Samsung) and go to this directory.
View the contents carefully. Often this contains installation files for applications that you have installed a long time ago. They are no longer needed and take up space uselessly. It is also worth checking the messenger folders inside the internal memory. For example, a directory Android/media/com.whatsapp or Telegram can store thousands of duplicate images and videos that you have viewed for years.
For easy navigation, use sorting by size or date. It’s best to move files that won’t open or have strange extensions to your computer or the cloud before deleting them. Manual sorting allows you to avoid losing important receipts, tickets or work documents that are often lost in the general stream of downloads.
Use the "Recent Files" function in the file manager to quickly find and delete what you downloaded in the last week but never opened.
Deleting residual files and empty folders
When deleting applications using standard Android tools, their “tails” - empty folders or configuration files - are often left on the device. This data does not affect the operation of the system, but clogs the file structure. To find them, enable the display of hidden files in the file manager settings.
Look for folders with the names of deleted applications. If you are sure that the app is no longer needed, you can safely delete such a directory. It is also worth checking the root of the internal memory for files with the extension .log or temporary files with the extension .tmp. They are created by error reporting systems and can take up a significant amount of space if the smartphone is used for a long time.
However, be careful with the folder Android. Inside it is important data for running current applications. Delete the contents of this folder only selectively, understanding what a specific subdirectory is responsible for (usually it is called the name of the application package, for example, com.instagram.android).
| Type of files | Where to look | Is it possible to delete | Risks |
|---|---|---|---|
| APK installers | Download folder | Yes, sure | No risks |
| Application cache | Settings → Applications | Yes | The application will download the data again |
| .Thumbnails files | DCIM/.thumbnails | Yes | The gallery will be slower to open the preview |
| Deleted folders games | Internal memory | Yes | Loss of progress if there is no cloud |
Cleaning multimedia and duplicate photos
Photos and videos are the main content that takes up space on a modern cameras are getting better, and the file size is growing. Before deleting important frames, check for duplicates. Often we take several similar pictures in a row, select the best one, and forget to delete the rest.
Use the built-in gallery tools to search for similar images or use third-party algorithms if they are not in the stock application. Also, do not forget about the folder. data-i="109">(Trash) in the gallery. Deleted photos are often stored there for another 30 days, continuing to take up space. Emptying the trash will free up space instantly. Trash (Basket) in the gallery. Deleted photos are often stored there for another 30 days, continuing to take up space. Emptying the Trash will free up space instantly.
For video files, the situation is even more acute. A minute-long 4K video can weigh hundreds of megabytes. Review your collection and ruthlessly delete unsuccessful videos, blurry frames or screencasts. I wrote it down to show the problem to a friend, but never deleted it.
⚠️ Attention: Menu interfaces and item names may differ depending on the version of Android and the manufacturer's shell (MIUI, OneUI, ColorOS) If you do not find the item described, use the search in the settings.
What is the .thumbnails folder?
This is a hidden system folder that stores thumbnails of all your photos for quick display in your gallery. Over time, it can grow to several gigabytes. You can delete it, but the system will create it again the next time you open the gallery.
Using built-in optimization tools
You should not ignore standard system tools. Android has a built-in optimizer. For Xiaomi it is the “Security” application, for Samsung it is “Device Maintenance”, for pure Android it is the “Storage” section with recommendations.
These tools can find large files, unused applications and duplicates. They work safer than third-party apps, as they have deep access to the system and do not contain malicious advertising. Run a scan and take the recommended actions. This will take no more than a minute.
Built-in utilities they may also suggest clearing random access memory (RAM), although in modern versions of Android this does not always give a performance boost. However, cleaning storage through them is a completely working and free method of maintaining order.
Built-in system utilities are preferable to third-party cleaning applications, since they do not load the phone in the background and do not show ads.
Prevention and transfer of data to the cloud
The best cleaning is the one that you don’t have to do all the time. Set up automatic uploading of photos and videos to cloud services, such as Google Photos, Yandex.Disk or Mail.ru Cloud. After successful downloading, enable the “Free up space” function, which will delete local copies of files, leaving them available in the cloud.
Also review your messenger settings. Disable autosaving of received photos and videos to the gallery. In Telegram, for example, you can set up automatic cache clearing: go to Settings → Data and memory → Memory usage and set the cache clearing timer (for example, 3 days or 1 week). This will prevent the accumulation of gigabytes of garbage in the future.
Regularly, once a month, take 10 minutes to check the “Downloads” folder and remove unnecessary applications. This simple habit will allow your phone to remain fast and responsive throughout its entire life without the need for a factory reset.
Is it safe to delete the Android/data folder?
Deleting the entire folder is not recommended, since the data of all installed games and apps is stored there. This will reset application settings and lose game progress. You can only delete specific subfolders of those applications that you have already deleted from your phone.
Why was the space not freed up after cleaning?
Perhaps you only cleared the cache, which was quickly restored, or the trash bin in the gallery and file manager was not emptied. Also check to see if cloud synchronization is enabled, which can download files back to the device.
Do you need to use applications like Clean Master?
In most cases, no. Modern versions of Android manage RAM and background processes independently. Third-party cleaners often work aggressively, closing the necessary processes, and show intrusive advertising, which reduces overall performance.
How to remove system junk without root access?
Without root access, access to deep system partitions is denied. You can only remove user trash: application cache, downloads and media files. To deep clean the system, a full reset to factory settings is usually required.