What files should be deleted on Android: cleaning guide

Smartphones based on the Android operating system begin to work slower over time, and notifications about low internal memory appear more and more often. This is an inevitable process of accumulation of digital waste that occurs as a result of running applications, system updates and everyday use of the device. Understanding which data is critical and which can be safely deleted will help restore the gadget to its former speed.

Many users are afraid to delete files manually for fear of damaging the system or losing important data. However, knowing the structure of the file system and the purpose of specific directories, you can safely free up gigabytes of space. In this article, we will take a detailed look at the types of data to be deleted and tools for safe cleaning.

System cache and temporary files

The largest part of temporary data is application cache. These are files that apps create to speed up their work, for example, thumbnails of images in a gallery or data for fast loading pages in the browser. Over time, these files accumulate, occupying hundreds of megabytes, although their value to the system is minimal.

Deleting the cache will not lead to the loss of your personal data, logins or passwords. Applications will simply regenerate the necessary temporary files the next time they are launched. To clean, you can use the built-in tools: go to Settings → Applications, select a specific application and click Clear cache. This is a safe procedure that should be carried out regularly.

Particular attention should be paid to the cache of instant messengers, such as Telegram or Viber. These apps save all viewed photos and videos to local memory. In the settings of the applications themselves, there are “Data and Memory” sections where you can clear the cache with one click or configure automatic deletion of media files older than a certain period.

Download folders and duplicate media files

Directory Download often turns into a repository for forgotten installation files, PDF documents and images. Many users download files, open them once and forget to delete them. Checking this folder is the first step to freeing up space.

You should also pay attention to duplicate photos and videos. When editing photos or using different cameras, copies of the originals are often created. Removing duplicate files is an effective way to optimize. Here is a list of file types that can often be deleted:

• 🗑️ Installation files .apkremaining after updating apps
• 📄 Temporary documents in the format .tmp or .log
• 🖼️ Thumbnails images in the folder .thumbnails
• 📦 Archives .zip and .rarthat have already been unpacked

Use a file manager to sort files by size. This will help you quickly find the heaviest objects that you may not even remember. Often in the folder DCIM you can find videos in 4K resolution, shot by mistake, which take up a disproportionate amount of space.

Clearing data from instant messengers and social networks

Social networks and instant messengers are the main culprits that fill up the memory on a modern smartphone. Applications like WhatsApp, Instagram and TikTok aggressively cache content. In WhatsApp there is a separate folder structure where sent and received media files are stored.

Inside the phone memory you can find a folder Android/media/com.whatsapp (or similar for other OS versions), where all received statuses, pictures and videos are stored. Many of them are viewed once and are no longer needed. Manually cleaning these directories allows you to free up gigabytes without deleting the correspondence itself.

⚠️ Attention: Before deleting files from messenger folders, make sure that important photos are saved in cloud storage or on your computer. Deleting them from the file system may make them unavailable in the chat.

To clear data in Instagram or Facebook it is better to use the built-in functions of applications, since directly deleting files through Explorer can lead to failures in the display of the feed. In the settings of these apps there is a “Clear cache” item, which safely deletes temporary session data.

Secret .nomedia folder

If you create an empty file called .nomedia in the folder with pictures, the gallery will stop scanning this directory. This is useful for hiding system icons from general viewing, but does not save space.

Deleting remnants of deleted applications

When you delete an application in the standard way, its “tails” - folders with settings, logs and temporary data - are often left on the device. These directories are usually located in the root of the internal memory or in the Android/datafolder. They are not deleted automatically after uninstalling the app.

You can find such folders by the name of the uninstalled application. For example, after deleting a game, there may be folders with textures or saves that will never be used again. Removing them is completely safe for the current operation of the system, since the connection with the executable file of the app is already broken.

To search for such remains, it is convenient to use specialized utilities or file managers with a memory analysis function. They scan the device and show folders belonging to apps that are no longer in the list of installed applications.

Data type	Location	Deletion security	Recommended frequency
Cache applications	/data/data/...	High	Once a month
APK installers	/Download	Absolute	Immediately after installation
System logs	/data/log	High (requires Root)	If there is not enough space
Photo thumbnails	DCIM/.thumbnails	High (recreated)	Once every six months

Working with the Android folder and system garbage

The folder Android on the internal drive contains data of all installed applications. Inside it there are subfolders data and obb. C obb stores cache files of heavy games (textures, music, levels). Deleting the contents of this folder will cause games to stop running and require you to download the data again.

However, if you deleted the game, the corresponding folder in Android/obb may remain. Its name usually matches the package name of the application (for example, com.roblox.client). Such orphaned folders can and should be deleted manually. This is one of the most effective ways to reclaim space after deleting large projects.

System junk, such as debug logs or error reports, can also accumulate. On devices without root access access to deep system partitions is limited, but cleaning through the developer menu or special recovery modes (Recovery Mode) can help. The Recovery menu often has an item Wipe Cache Partitionthat deletes the system cache without affecting personal data.

Using built-in tools and utilities

Modern Android shells, such as MIUI, One UI or ColorOShave built-in tools for cleaning up memory. They automatically find unnecessary files, duplicates and large cache volumes. Using a standard cleaner is often safer than manual deletion, since the system knows which files are critical for its operation.

Third-party applications like Files by Google also offer smart cleaning. They analyze the content and suggest removing blurry photos, screenshots from two years ago, or large video files that you rarely watch. Such tools help make decisions about deletion based on usage statistics.

⚠️ Attention: Menu interfaces and item names may differ depending on the smartphone model and Android version. If you are not sure of the purpose of the file, it is better to search for information about it on the Internet before deleting it.

You should not abuse the “acceleration” and “cooling” functions in dubious applications from the Play Market. Often they just show ads and do not provide any real benefit, and sometimes they even slow down the device by constantly running in the background. Trust proven solutions from the device manufacturer or major technology companies.

Frequently asked questions (FAQ)

Is it possible to delete the Android folder completely?

No, delete the entire folder Android is not allowed. This will reset the settings of all applications, loss of game saves and incorrect operation of the system. You can only delete specific subfolders within it that correspond to already deleted applications.

Is it safe to delete the .thumbnails file?

Yes, a file or folder .thumbnails in a directory DCIM can be deleted. This is a thumbnail cache for the gallery. The system will automatically create it again the next time you open the gallery, but this will free up space right now.

What should you do if, after deleting files, your phone starts to slow down?

You may have deleted system files or data from critical applications. Try rebooting your device. If the problem persists, check whether you have deleted the files from the folder Android/obb for running games - you will have to download them again.

How to clear the cache of all applications at once?

In the Android settings, go to the section Storage or Memory. There is often a "Clear cache" button for all applications at once. On some models, this feature is available through the quick access menu or the Phone Manager application.

Do .log files take up a lot of space and can they be deleted?

Files with the extension .log —these are logs of errors and app operation. They can take up significant volume over time. Deleting them is safe for the average user, since they are mainly needed by developers for debugging.