Thumbnails folder on Android: what are these files, can they be deleted and how to properly clear the cache thumbnails

If you have ever looked at the file system of your Android smartphone through Explorer or a memory cleaning application, you have probably noticed a folder called Thumbnails. It can take up several megabytes to gigabytes of precious space, especially on devices with a lot of photos and videos. But what exactly is stored in this folder? Why does the system create it automatically, and is it possible to delete its contents without consequences?

Many users mistakenly believe that Thumbnails are just junk files that can be safely erased. However, everything is not so simple. This folder is closely related to the work Android galleries, Google Photos and other multimedia applications. It stores not the originals of your pictures, but their reduced copies - thumbnailswhich speed up the loading of previews when scrolling through the gallery. Without them, every time you open an album, the smartphone would have to re-generate a preview, which would slow down the system.

In this article we will look in detail at:

- What kind of files are stored in Thumbnails and how they are created.

- Is it possible to delete a folder completely or partially, and what consequences will this lead to?

- How to properly clear the thumbnail cache to free up space without harm to the system.

- Why a folder can appear again after deletion, and how to control it.

If you have long wanted to deal with this mysterious folder, but were afraid of breaking something, read on. We will give clear instructions and explain all the nuances.

What is the Thumbnails folder on Android and why do you need it?

The folder Thumbnails (translated from English as “thumbnails”) is a system directory that is automatically created by Android to store small copies of images and videos. Its main task is to to speed up the display of previews in a gallery, file manager or other applications that work with multimedia.

Imagine: you open a gallery with a thousand photos. If a smartphone downloaded original files each time (weighing, for example, 5–10 MB), scrolling would be extremely slow, and the battery would drain much faster. Instead, the system generates thumbnails once (usually ranging in size from 5 to 50 KB) and stores them in Thumbnails. Now, when you open an album, it is these light copies that are loaded, and the originals are loaded only when you click on the photo.

The folder may be located in different places depending on the version of Android and the smartphone manufacturer. Most often, it can be found in the following paths:

• 📁 /storage/emulated/0/DCIM/.thumbnails — standard location for most devices.
• 📁 /storage/emulated/0/Pictures/.thumbnails — alternative path on some firmware.
• 📁 /data/data/com.android.gallery3d/cache — system gallery cache (available only with root access).

It is important to understand that Thumbnails is not the only place where thumbnails are stored. Some applications (for example Google Photos or Viber) create their own cache folders with previews. However, the system folder Thumbnails is used by default by most standard galleries, including Google Gallery and Samsung Gallery.

What files are stored in the Thumbnails folder and how they are created

Inside the folder Thumbnails you will find files with extensions .thumb, .jpg or without an extension at all. Their names are usually a set of numbers and letters, for example:

• 🖼️ thumb_123456789012345.jpg — thumbnail for a photograph.
• 🎥 video_987654321098765.jpg — preview for a video (frame from the middle of the video).
• 📄 1578946320000 — thumbnail without extension (time of creation in timestamp format).

These files are generated automatically in the following cases:

1. When you open the gallery for the first time after adding new media files. The system scans folders DCIM, Pictures and others where photos/videos are stored, and creates thumbnails for new files.
2. When editing or rotating an image. If you cropped the photo or changed its orientation, the gallery may regenerate the thumbnail.
3. When clearing the gallery cache manually. After cleaning, the thumbnails are created again the next time you open the application.
4. When restoring media files from a backup. For example, after transferring a photo from the cloud back to the phone.

The size of the thumbnails depends on the screen resolution of your smartphone and the version of Android. For example:

Screen resolution	Thumbnail size (pixels)	Approximate file weight
720×1280 (HD)	160×160 or 320×320	5–20 KB
1080×1920 (Full HD)	512×512	20–50 KB
1440×2560 (QHD)	512×512 or 720×720	50–100 KB
4K (on tablets)	1024×1024	100–200 KB

Interestingly, thumbnails for videos usually weigh more than for photos, because they represent a full JPEG frame extracted from the middle of the video. For example, a preview for a video in resolution 1080p can take up to 300–500 KB.

Is it possible to delete the Thumbnails folder and what will this lead to?

Short answer: yes, you can. But with reservations. Deleting a folder Thumbnails will not damage your original photos and videos - they will remain in place. However, after deleting, you will face two consequences:

1. The gallery will work slower when first opened. The system will have to re-generate thumbnails for all media files, which can take from a few seconds to minutes (depending on the number of photos).
2. The folder will appear again. Android will automatically restore Thumbnails the next time you launch the gallery or after rebooting the device.

However, deleting thumbnails is one of the safest ways to free up space on your internal driveespecially if the folder has grown to hundreds of megabytes. The main thing is not to confuse it with original media files DCIM or Pictures!

What happens if you delete only part of the files from Thumbnails? Nothing critical. The gallery will simply recreate the missing thumbnails the next time you open it. However, this may lead to minor lags when scrolling through albums until the previews are generated again.

What happens if you delete Thumbnails on a rooted smartphone?

On rooted devices, you can not only delete a folder, but also prevent its creation by changing access rights (chmod). However, this may cause problems with the gallery or other applications that use the system thumbnail cache. For example, some messengers (for example, Telegram or WhatsApp) may stop displaying previews of sent photos.

If you still decide to clear Thumbnails, here's what you need to know:

• ✅ Safe: Deleting will not affect the original ones photo/video.
• ⚠️ Temporary effect: The folder will be returned, but its size will be smaller, since thumbnails will be created only for current media files.
• ❌ Ineffective: If you have little space, it is better to move the photo to SD card or to the cloud, and not clear only the cache.

How to properly clear the Thumbnails folder: step-by-step guide

To clear thumbnails without risk to the system, follow these instructions. The methods differ depending on whether you have root access or not.

Method 1: Uninstall without root (for most users)

1. Open any file manager (for example Files by Google, Solid Explorer or standard Explorer).
2. Navigate to path /storage/emulated/0/DCIM (or /storage/emulated/0/Pictures).
3. Find the folder .thumbnails (it may be hidden - turn on the display of hidden files in the Explorer settings).
4. Select all the files inside the folder and click “Delete.”
5. Confirm the action. The folder will remain, but its contents will be cleared.

Method 2: Clearing through the Gallery application settings

Some firmware (for example, on smartphones Samsung, Xiaomi or Huawei) allow you to clear the gallery cache directly from the application menu:

1. Open Gallery (standard application for viewing photos).
2. Tap on ⋮ (three dots) in the upper right corner and select Settings.
3. Find the section Clear cache or Memory management.
4. Click Clear thumbnails or Delete cache.

Method 3: With root access (for advanced users)

If you have rootyou can completely delete the folder and prohibit its creation:

su
rm -rf /storage/emulated/0/DCIM/.thumbnails
chmod 000 /storage/emulated/0/DCIM/.thumbnails

However, this method not recommended is not recommended for ordinary users, as it can lead to malfunctions in the gallery.

After cleaning:

• 🔄 Restart your smartphone for the changes to take effect.
• 📱 Open the gallery - the thumbnails will begin to be generated again (this may take a few minutes).
• 📊 Check the free space in the storage settings (Settings → Storage).

Why the Thumbnails folder grows quickly and how to prevent it

If you notice that the folder Thumbnails occupies several gigabytes and is constantly growing, the reasons may be as follows:

• 📸 Too many photos and videos. Each media file has a corresponding thumbnail, and if you have 10,000 pictures, the cache will be huge.
• 🎥 High-resolution videos. Previews for videos weigh many times more than for photos (up to 500 KB each).
• 🔄 Frequent synchronization with the cloud. Applications like Google Photos can recreate thumbnails every time the gallery is updated.
• 🐛 Gallery malfunctions. Sometimes the system creates duplicate thumbnails or does not clear old ones files.
• 📱 Firmware with bugs. On some devices (especially with custom firmware), the thumbnail cache is not optimized.

How to prevent folder growth:

1. Regularly clean the gallery of unnecessary files. Delete duplicates, bad pictures and old videos.
2. Transfer media files to an SD card or to the cloud. For example, in Google Photos you can enable the “Free up space” option, which will delete local copies after uploading to the cloud.
3. Disable automatic loading of media in messengers. In WhatsApp, Telegram and other applications, you can prevent automatic saving of photos to the gallery.
4. Use alternative galleries. Some applications (for example, Simple Gallery or QuickPic) use cache space more economically.

If a folder Thumbnails weighs more 1–2 GB, this is a reason to think about cleaning your media library. Most likely, too many unnecessary files have accumulated on your device.

What to do if the Thumbnails folder is not cleared or appears again

Sometimes users are faced with the fact that after deleting the Thumbnails folder is restored, or its contents are not completely cleared. Here are possible reasons and solutions:

Problem	Cause	Solution
The folder appears immediately after deletion	The gallery or another application is actively using cache	Close all applications that work with media before clearing
Files in Thumbnails are not deleted	No write/delete rights	Use a file manager with root access or check permissions
The folder takes up too much space after cleaning	Too many media files or the gallery is not working	Delete unnecessary photos/videos or reset the gallery settings
Thumbnails are not regenerated	The system media scanner has failed	Reboot the device or clear the application cache Media storage (Media Storage)

If none of the methods help, try the following:

1. Clear the cache and application data Gallery:
   1. Go to Settings → Applications.
   2. Find the application Gallery (or Google Photo).
   3. Click Storage → Clear cache and Clear data.
2. Reboot the device in safe mode:

   Sometimes third-party applications are to blame. Boot your smartphone into safe mode (usually hold the Power button → "Safe Mode") and check if the folder is restored.

3. Reset the media scanner settings:

   Go to Settings → Applications → ⋮ → Show system → Media storage and clear cache.

If the problem persists, the firmware may be to blame. On some devices (especially with custom ROMs), the media scanner does not work correctly. In this case, only flashing or resetting to factory settings will help. settings.

Alternative ways to manage thumbnails on Android

If standard cleaning methods Thumbnails do not suit you, consider alternative approaches:

• 🔧 Use third-party galleries. Applications like Simple Gallery Pro or A+ Gallery allow you to disable thumbnail caching or store them in another location.
• ☁️ Store photos in the cloud. Services like Google Photos or Yandex Drive automatically optimize the storage of thumbnails and do not clog the device memory.
• 📁 Transfer media to an SD card. If your smartphone supports memory cards, move the folders DCIM and Pictures to an external drive. Thumbnails will be created there.
• 🛠️ Set up automatic cleaning. Applications like SD Maid or CCleaner can regularly clear the thumbnail cache on a schedule.

For experienced users, there is another way - disable the generation of thumbnails at the system level.To do this, you need to:

1. Get root access.
2. Install an application for editing system files (for example, Root Explorer).
3. Find a file /system/build.prop and add the line to it:

   ro.media.enc_thumbnail_quality=0

   This will disable the creation thumbnails for new media files.

4. Reboot the device.

However, this method has disadvantages:

• The gallery will work slower.
• Some applications (for example, instant messengers) may stop displaying previews.
• After updating the firmware, the settings will be reset.

Therefore, we recommend this method only to those who really understand Android settings and are prepared for possible bugs.

FAQ: Frequently asked questions about the Thumbnails folder on Android

❓ Is it possible to delete the folder Thumbnails in its entirety, and not just its contents?

Technically, yes, but it will be created again the next time you start the gallery. Complete deletion of the folder is only possible with root access, but this can lead to failures in multimedia applications. It is better to clean only the files inside the folder.

❓ Why does the Thumbnails folder take up a lot of space again after cleaning it? places?

This happens because the thumbnails are regenerated for all media files in the gallery. If you have a lot of photos and videos, the cache will quickly grow. To prevent this, regularly clear your gallery of unnecessary files or transfer them to the cloud.

❓ Does deleting Thumbnails affect the performance of your smartphone?

Short-term - yes. After cleaning, the gallery will run slower until it regenerates the thumbnails. However, in the long run, this may even speed up the system, as it will free up space on the internal storage.

❓ Is it possible to disable the creation of thumbnails without root?

No, you cannot completely disable the generation of thumbnails without root access. However, you can reduce their number by clearing the gallery of unnecessary files or using alternative applications for viewing photos (for example, Simple Gallery), which use cache more economically.

❓ Why does the Thumbnails folder weigh more on some smartphones than on others?

The size of the folder depends from:

• Number of media files in the gallery.
• Screen resolutions (on devices with 4K thumbnails weigh more).
• Firmware (some manufacturers, for example Samsung or Huawei, store additional cache files).
• Video availability (video previews take up many times more space than photos).