Smartphones based on Android over time begin to work slower, and free memory space disappears at an alarming rate. Often the culprit is the standard Gallery application, which accumulates gigabytes of hidden thumbnails and temporary files. If your phone is slow or displays a “Memory Full” error even when everything seems to be deleted, the problem may lie in the system cache.
Users often confuse deleting photos from an album with completely clearing the application itself. These are two different procedures, each of which has its own consequences for the device. In this article, we will look at how to properly free up spacewithout losing valuable pictures, and why standard deletion of files does not always solve the problem.
There are several levels of cleaning: from simple deletion of pictures to deep cleaning of system folders hidden from the eyes of the average user. We will look at safe methods for all versions of the operating system, including the latest interface updates. Deleting the .thumbnails folder is the most effective way to combat system memory bloat, but requires access to hidden files.
The difference between deleting photos and clearing the cache
Many users mistakenly believe that deleting photos from "Recently Deleted" album completely clears the application. In fact, the Gallery creates a lot of temporary files to quickly scroll through the feed. These files are called cache or thumbnails. They allow the system to instantly display image previews without loading the high-resolution original each time.
When you simply delete pictures, these service files often remain “dead weight” in the device’s memory. Over time, their volume can reach several gigabytes, which is critical for smartphones with a small amount of built-in storage. Clearing the cache is safe for your personal data since it only affects temporary files.
However, there is the concept of “clearing app data.” Unlike the cache, this process resets the Gallery to factory settings. This may cause the albums or display settings you created to disappear, but the photos themselves saved in the phone memory or on the card SDwill remain intact.
⚠️ Attention: Before performing the “Clear Data” procedure, it is strongly recommended to ensure that all important pictures are copied to cloud storage or to a computer, as in rare cases, some specific display settings may be lost.
Understanding the difference between these file types is the first step to competent memory management. Below is a table that will help you decide on the necessary action:
| Action | What is deleted | Impact on the photo | Security |
|---|---|---|---|
| Deleting from the recycle bin | The image and video files themselves | Photos disappear forever | Requires caution |
| Clearing the cache | Temporary thumbnails, thumbnails | None, photos in place | Completely safe |
| Clear data | Settings, history, cache | Photo in place, reset settings | Safe for files |
| Remove updates | Gallery system update files | None | Returns the factory version |
Clearing the cache is a safe operation that does not delete your personal photos, but only temporary service files to speed up work.
Basic cleaning through Android settings
The easiest and safest way to remove excess garbage is to use the built-in tools of the operating system. This method does not require the installation of third-party software and is available on any device, be it Samsung Galaxy, Xiaomi or pure Android from Google. The algorithm of actions may differ slightly depending on the manufacturer's shell, but the logic remains the same.
First you need to get to the application management menu. Typically the path looks like this: go to Settings → Applications → All applications. In some models, for example Huawei or Honor, you need to select the “Application Management” item. Find “Gallery” or “Photos” in the list.
Once in the application menu, you will see a “Storage” or “Memory” button. By clicking on it, the system will show how much space the application data itself takes up and how much space is taken up by the cache. It is the “Clear cache” button that is your target tool for quick prevention.
☑️ Basic cleaning algorithm
If the “Clear cache” button is inactive or gray, it means that there are few temporary files accumulated, and the problem is most likely elsewhere. In this case, it is worth checking whether the “Trash” folder, which is often forgotten to empty, is not taking up a lot of space. Also pay attention to the volume of data - if it is large without thousands of photos, there may be erroneous files stuck in the cache.
Deleting the hidden .thumbnails folder
This is the most effective method for owners of smartphones with full memory. The system Android automatically creates a folder named .thumbnails, which stores thumbnails of all images ever viewed. The main feature of this folder is that it is hidden from normal viewing and often grows to enormous sizes.
To get to it, you will need access to the file system. Open a standard explorer (Files, My File or any other file manager). In Explorer settings, be sure to enable the display of hidden files and folders. Usually this is a switch called “Show hidden files.”
Next follow the path DCIM → .thumbnails. Inside you will see many files with strange names. They can be safely deleted. After deleting, the folder may be automatically created again, but it will be empty or take up minimal space until you view a large number of photos again.
What to do if the .thumbnails folder is not deleted?
If the system writes “File busy” or “No access”, try rebooting the phone into safe mode or using a third-party file manager with root access, although in 99% of cases it is enough to simply close the Gallery application completely through the task manager before deleting it.
Some users recommend not deleting the folder, but creating a text file in the same place and renaming it to .thumbnails (removing the .txt extension). This blocks the system from creating a new sketch folder because a file with the same name already exists. However, this may result in slower loading of previews in the Gallery.
Use of Google Photos and cloud services
Modern smartphones are increasingly used Google Photos as the main gallery. This app has a powerful built-in space freer that works differently than the standard cache cleaner. Free up space finds copies of photos that are already stored in the cloud and removes them from your device.
To use this method, make sure sync is turned on. Open the app, tap your profile avatar, and select Free up space. The system will analyze the storage and offer to delete local copies of those images that are already securely stored in the cloud. This allows you to maintain access to photos via the Internet, but remove their weight from the phone.
It is important to understand that after such an operation the photos will disappear from local memory. If you don't have internet, you won't be able to watch them unless you enable on-demand downloads. Therefore, this method is ideal for those who have stable access to the network and want to relieve the built-in storage as much as possible.
⚠️ Attention: Before using the “Free up space” function, make sure that the backup (Backup & Sync) is completely completed. Otherwise, you risk deleting the originals from your phone without waiting for them to be uploaded to the cloud.
In addition, in the Google Photos settings you can limit the upload quality. Selecting the “Space Saver” mode instead of the “Original” mode allows you to store thousands of photos for free (with compression), which indirectly helps keep the archive organized and makes it easier to clean it up if necessary.
Third-party cleaning applications
If the built-in tools seem insufficiently effective to you, specialized utilities come to the rescue. Applications like Clean Master, CCleaner or Files by Google can find duplicates, blurry pictures and old screenshots that take up space but are not visible during a quick glance.
Such apps scan the device deeper than a standard Explorer. They can find a cache not only of the Gallery, but also of instant messengers (WhatsApp, Telegram), where thousands of transferred images are often stored. However, you should be careful: aggressive cleaning may delete the necessary files if you do not check the list before deleting.
Usage antivirus and optimizers also help identify malware that can masquerade as system processes and bloat memory. Regularly scanning your phone is a good habit to maintain its performance.
Use the Files by Google application from the OS developer itself - it is the most secure and does not contain intrusive advertising, unlike many analogues.
What to do if the Gallery is slow
Slow performance of the Gallery is a frequent accompaniment of a full cache, but not the only reason. If after cleaning the application is still slow, try resetting it to factory settings. This will return the Gallery to the “as after purchase” state, removing possible software errors.
The problem may also be in the file format. If you shoot video in 4K or photo in RAWformat, the standard Gallery may not be able to process them in real time. In this case, installing an alternative image viewer from Play Market, which is better optimized for heavy files, will help.
Do not forget that the speed of operation also depends on the general state of the system. If the free memory on the device is less than 10%, the entire phone will slow down, not just the Gallery. In this case, you need to remove large applications or transfer files to a memory card.
Why does the Gallery take a long time to load after cleaning?
After completely clearing the cache, the system takes time to re-create thumbnails. In the first few minutes or even hours, scrolling through the feed may be slow - this is a normal indexing process.
As a last resort, if the Gallery constantly crashes or freezes, you can try uninstalling updates for it. This will roll back the application to the factory version. To do this, go to the application settings and click the three dots in the corner of the screen, selecting “Delete updates”.
Is it safe to delete the .thumbnails folder?
Yes, it is absolutely safe. This folder stores only thumbnails (previews) of your photos. When deleting the folder, the original images themselves will not be affected. The system will simply create this folder again when necessary.
Will my photos disappear after clearing the Gallery data?
No, your personal photos and videos saved in the phone memory or SD card will remain in place. Clearing data only resets the settings of the application itself, such as the sort order, hidden albums and cache.
Why is the space not freed up after deleting a photo?
Most likely, the photos remained in the “Recently Deleted” folder (Trash) for 30 days. Also, space can be taken up by hidden copies in instant messengers or cloud services that synchronize data with the device.
Is it possible to permanently prohibit the creation of the .thumbnails folder?
There is no official way to prohibit its creation, since this is a system function of Android. However, you can use the method of creating a stub file with the same name, which temporarily blocks writing garbage to this directory.