Opening DTHUMB Files

The DTHUMB file type is primarily associated with Gallery3D.

DTHUMB	File extension: DTHUMB
	File type:	video thumbnail file

What is a DTHUMB file?

DTHUMB files mostly belong to Gallery3D. DTHUMB files are used on Android systems as a video thumbnail cache. They are stored in an MP4 container and hold short preview clips for videos.
These files are managed by the Android operating system to help apps like Gallery3D display video previews quickly.
Key details provided by FilExt.com include:

Format: Uses the MP4 container, similar to standard video files.

Purpose: Caches video thumbnails to speed up the display in gallery apps.

Operation: Automatically generated and maintained by the Android system.

FilExt.com tip: If you need to open one, an MP4-compatible media player may display its content. However, these files are generally not meant for manual editing.

How to open DTHUMB files

You need a suitable software like Gallery3D to open a DTHUMB file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your DTHUMB file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a DTHUMB file directly in the browser:. Just drag the file onto this browser window and drop it.

Online DTHUMB Text Viewer

Choose your .dthumb file to analyze

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Online File Viewer

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Programs that open and convert DTHUMB files:

Gallery3D
See the previous paragraphs to learn more about the main application. DTHUMB files are often referred to as Gallery3D videos because this type of file is primarily created or used by this software.
Android OS (Gallery3D/Google Photos)
A .DTHUMB file is a thumbnail image used by the Android operating system, specifically within the Gallery3D application (later evolved into Google Photos). These files store small preview images of videos, allowing for quick browsing and access without needing to load the full video. The "DT" likely stands for "Directory Thumbnail." The internal structure of .DTHUMB files isn't publicly documented and may vary between Android versions, but they generally contain a compressed image representation, potentially optimized for quick display within the gallery interface. While associated with Gallery3D, other gallery apps or custom ROMs might also utilize this format. Direct interaction with these files isn't recommended, as they are managed by the system. Modifying or deleting them could lead to issues within the gallery application. This file format is classified as Image.

DTHUMB file format:

If you can determine the file format, the associated program can also be determined. The file format can be determined based on the file extension and the signature (the first few characters of a file). However, different programs can use the same file extension. Furthermore, a file extension can be renamed incorrectly and double-clicking on it will then display an error when it is opened. So you need a detailed analysis of a file to find out the format and the associated program. Below you will find our evaluation of the DTHUMB files:

The DTHUMB file extension is used very often and is mainly used by one program with a specific format. The two most common formats are as follows:

96% of all DTHUMB files are based on the well-known MP4 file format. MP4 is a multimedia container format used to store video and audio and allows streaming over the Internet. If you open these files in a text editor, you will see only illegible characters. A typical file size is 310 KB. The file type is relatively new. Several words can almost always be found in the files, e.g. ftypmp42, isommp42, isom3gp4, ftypisom, free and mdat.

All the rest of the DTHUMB files (4%) have different formats. Drag & drop your file here to see the file format and a preview of your DTHUMB file!

Technical Data for DTHUMB File Extension

File classification:

Video

Related files:

thm, 3gp, thumb, dth, tmp, nomedia, check, exe, mp4, jpg, zip, tdt, png

a dthumb video thumbnail file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with DTHUMB files

Associate the DTHUMB file extension with the correct application.
Update your software that should actually open video thumbnail files. Because only the current version supports the latest DTHUMB file format. Search, therefore, e.g. on the manufacturer website after an available Gallery3D update.
To make sure that your DTHUMB file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .DTHUMB file online - secure, fast, and no downloads needed.