Can I delete the .thumbnails folder on Android?

Last reviewed: October 20, 2026 · Markdown version

Probably, in our reading, but look inside it first. Android's developer reference describes thumbnails as separate files tied to an original picture, which points to a preview cache rather than your photos. What the reference covers, and the gaps it leaves, are set out below, so you can judge for your own phone.

What Android's reference says about thumbnails

The old MediaStore.Images.Thumbnails class "provides utility methods to obtain thumbnails for various Images items". Its columns describe each thumbnail as a record of its own: DATA is the "Path to the thumbnail file on disk", and an IMAGE_ID column points back to the original image. The class itself "was deprecated in API level 29", that is Android 10, with the advice that "Callers should migrate to using ContentResolver.loadThumbnail, since it offers richer control over requested thumbnail sizes and cancellation behavior" (MediaStore.Images.Thumbnails, Android Developers, read 20 October 2026). In plain terms, newer apps are told to ask Android for a thumbnail rather than look for a thumbnail file themselves.

What it does not say

Neither that reference nor Android's list of standard folders names a .thumbnails folder. The folder list describes DCIM/ (DIRECTORY_DCIM) as "The traditional location for pictures and videos when mounting the device as a camera" and goes no further (Environment, Android Developers, read 20 October 2026). Nothing on either page says which app creates a .thumbnails folder inside DCIM/, how big it may grow, or what happens when it is deleted.

How to decide on your own phone

If the folder is not visible, first turn on hidden files in your file manager. Then open the folder and look at a few of its files. If they are small, oddly named images that match pictures you already have elsewhere, they are very likely previews. If you find anything you do not recognise as a copy of a photo you can see in your gallery, stop there.

Our reading, which is an inference from the reference above and not a vendor statement: a thumbnail file is a copy made for display, so deleting one is not deleting the photo it points to; a gallery app that wants that preview again would have to make it again, and the folder may come back. Expect the space you free to be temporary for that reason.

Is it worth it?

Check the size before you bother. If the folder is a few megabytes, leave it. If storage is genuinely tight, the bigger wins are usually elsewhere: what the "Other" figure in storage is made of and how to find the largest files are better first stops than a preview cache.