Modern smartphones have huge amounts of memory, but even they begin to work slower over time. The main reason for the decline in productivity is the accumulation of digital “garbage”. This could be residual data from uninstalled apps, temporary cache files, duplicate photos, or forgotten downloads. When the internal storage is more than 90% full, the operating system has difficulty writing new data, which leads to interface “brakes.”
Many users are wondering how to delete unnecessary files on Android without damaging important data. The cleaning process does not require special technical skills or obtaining root access. It is enough to know where to look for hidden folders and what system tools to use. In this article, we will analyze in detail all the methods for freeing up space: from built-in tools to advanced utilities.
Do not be afraid to delete the system application cache. This is temporary data that speeds up the launch of apps, but deleting them is safe - the next time you open the application, the system will create it again. However, it is important to distinguish the cache from real user data, such as chats in instant messengers or saves in games. Incorrect actions can lead to the loss of correspondence history.
Analyzing storage and searching for large files
Before you start deleting, you need to understand what exactly is taking up space on your device. The latest versions Android (starting from 11 and higher) have an excellent analytics system built in. Go to Settings → Storageto see a visualization of memory allocation. Here the system itself will offer to empty the trash or delete rarely used applications.
Often the bulk is occupied not by system files, but by media content. High-definition 4K videos can weigh gigabytes. If you made videos a year ago and no longer need them, deleting them will free up more space than clearing the cache of a dozen applications. Use the built-in file manager, sorting files by size.
Pay attention to the folder Downloads or Downloads. Browsers often save installation files there APKthat have already been installed, or PDF documents that you opened once. These files lie like dead weight in memory for months. You can safely delete them manually after checking the contents.
Clearing the application cache and system data
Cache is a buffer memory where temporary data is stored for fast app operation. Over time, it can grow to an inadequate size. For example, a social networking app can store gigabytes of pictures and videos you view, even if you didn't save them. Clearing the cache is the safest way to quickly free up space.
To delete the cache of a specific application, go to Settings → Applications. Select the desired app from the list, for example YouTube or Instagram. Click on "Storage" or "Memory". You will see two buttons: “Clear cache” and “Clear data”. Be careful: the “Clear data” button will reset the application to its factory state, deleting your logins and settings.
In some shells, such as MIUI from Xiaomi or OneUI from Samsung, there are built-in optimization tools. They allow you to clear the cache of all applications with one click. This is convenient, but less flexible than manual wipe because you have no control over exactly what data is deleted. Regularly clearing the browser cache is also important, since web pages leave a lot of traces.
Clear the cache of instant messengers (Telegram, WhatsApp) right inside applications in the “Data and memory” section. There you can delete the cache, while saving the history of correspondence and media files in chats.
Deleting duplicate photos and videos
Over time, hundreds of similar pictures accumulate in the gallery. We take several shots of the same object to choose the best one, but we often forget to delete unsuccessful takes. Duplicates also occur when synchronizing with cloud services or when transferring data from an old phone. Storing identical files is an inefficient use of resources.
To find duplicates, you can use third-party utilities such as Files by Google. This is the official app from the search giant that securely scans your memory and suggests deleting copies of files. It finds not only complete duplicates, but also almost identical photos taken within a second of each other.
Manual gallery checking is also effective. Open the “Recently Deleted” album - often users delete photos, but forget to empty this trash bin, where the files are stored for another 30 days. Freeing this partition can instantly return several gigabytes of free space. Remember that deleting from the recycle bin is irreversible.
| File type | Average size | Where to look | Deletion security |
|---|---|---|---|
| Application cache | 100 MB - 2 GB | Settings → Applications | High (data will not be lost) |
| Downloads (APK, PDF) | 10 MB - 500 MB | Folder Downloads | High (if the file is not needed) |
| Thumbnails | 500 MB - 1 GB | DCIM/.thumbnails folder | Medium (the gallery will load slower) |
| Offline maps | 200 MB - 5 GB | Navigators (Yandex, Google) | Medium (needed to work without a network) |
Working with instant messengers: Telegram and WhatsApp
Messengers are the main “eaters” of memory on a modern smartphone. Telegram i WhatsApp automatically save all received photos, videos and documents to internal memory. If you are a member of dozens of chats and channels, up to 10 GB of garbage can accumulate in a month, which you don’t even know about.
Telegram settings have a powerful memory management tool. Go to Settings → Data and memory → Memory usage. Here you can see the total cache size. Enable the “Auto delete cache” function by setting a period, for example, 3 days. This will allow the application to store files only for the last three days, automatically deleting the old ones.
B WhatsApp The situation is similar, but the approach is slightly different. Go to Settings → Data and storage → Storage management. The application will show a list of chats that take up the most space. You can selectively remove media from specific conversations without deleting the conversation itself. This is especially useful for work chats, where heavy reports are constantly sent.
⚠️ Attention: Before mass clearing media files in instant messengers, make sure that important documents and photos are saved in another location. After deleting them from the chat, it will be impossible to restore them without a backup copy.
☑️ Checking messengers
Using third-party cleaning utilities
If the built-in tools are not enough, specialized cleaner applications come to the rescue. However, their choice should be approached carefully. Many “boosters” are themselves malware that display intrusive ads and collect user data. It is recommended to use only proven solutions from well-known vendors.
The application SD Maid is considered one of the best tools for deep cleaning. It finds "corpses" - files left behind after uninstalling applications - and allows you to safely erase them. It can also analyze a database of media files and remove broken thumbnails, which often take up space but are not displayed in the gallery.
Another reliable option is Ccleaner (mobile version). It offers a simple interface to clear cache, browser history and clipboard. It is important not to abuse the “RAM acceleration” (RAM) functions, since in modern versions Android the system itself effectively manages RAM, and forced unloading of processes can even slow down the phone.
Why shouldn’t you use “All in one” cleaners?
Many free applications with bright names like “Super Cleaner” or “Phone Boost” actually just show ads and make it look like it’s working. They often mark system files as garbage, scaring the user, and require a subscription for “safe” removal. It is better to use built-in tools or highly specialized utilities.
Transferring data to a memory card and to the cloud
If the internal memory is critically full, consider expanding the storage. Most modern smartphones support memory cards of format microSD. You can transfer photos, videos and music to them, leaving the internal memory free for installing applications and operating the system.
In the storage settings there is often a function “Use as internal memory” (Adoptable Storage). This allows the system to consider the memory card as part of the internal storage. However, please note that once formatted, the card will not be readable on other devices without reformatting, and the speed may depend on the class of the memory card.
An alternative to a physical card is cloud storage. Services like Google Photos or Yandex.Disk allow you to set up automatic uploading of pictures to the Internet. Once uploaded, you can use the Free Up Space feature, which will delete local copies of photos already stored in the cloud. This is an ideal option for those who do not want to carry unnecessary files with them.
⚠️ Attention: The writing speed to a microSD memory card is usually lower than that of the built-in flash drive. It is not recommended to install heavy games or applications on the memory card that require fast loading of data, otherwise you will experience slowdowns.
Regularly clearing the cache and transferring media files to the cloud is the most effective way to keep your phone fast without buying a new device.
Frequently asked questions about clearing memory (FAQ)
Is it safe to delete the Android folder on your phone?
No, you absolutely cannot delete the entire folder Android . It stores the data of all installed applications, their cache and configuration files (folders data and obb). Deleting this folder will reset all applications to their original installation state, and you will lose game progress and app settings. You can only delete the contents of subfolders cache within specific application directories, if you understand what you are doing.
Why is the space not freed up after deleting the files?
Most often this happens because the files ended up in the recycle bin of the file manager or gallery, but were not completely deleted. Check your Trash or Recently Deleted folders. It is also possible that you only deleted the shortcut or link to the file, but the file itself remained in another directory. In rare cases, a device reboot is required for the system to recalculate the amount of free space.
How to remove system applications that cannot be removed in the usual way?
To remove system software (bloatware) without root access, you can use USB debugging and a computer. Using the command adb shell pm uninstall --user 0 package name you can deactivate the application for the current user. However, this requires caution: removing critical system components may render the phone unusable ("bricked"). For beginners, it is better to simply disable such applications in the settings.
Does full memory affect Internet speed?
Directly - no, but indirectly - yes. When memory is full, the system has no place to create temporary files to buffer web pages and stream video. This can cause the browser to freeze when loading heavy sites. In addition, background application update processes may not work correctly, which creates the feeling of a slow Internet.