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THM MP4
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Convert THM to MP4

Can you convert THM to MP4?
Verified by Adam B.· reviewed by FE Editorial ·updated Aug 17, 2026
QUICK ANSWER
Is it possible to convert THM to MP4?
No - not a direct conversion.

The video you are looking for already exists: look in the same folder for a file with the same base name but a .mp4, .mov, or .avi extension. The .thm file is only the preview thumbnail the camera saves for its playback menu and contains a single still image, not footage.

No direct path
Also to MP4: AVCHD · USM · MXF

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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Why convert THM to MP4?

A .thm file stores one small JPEG still frame (typically around 160×120 pixels) that a camera or GoPro saves alongside each video clip purely for fast thumbnail display. It has no video stream, audio track, or codec data. .mp4 is a video container holding compressed video and audio, which the .thm file simply does not contain.

How to convert THM to MP4

VLC FREE

Locate the companion video file with the same base name as the .thm (look for .mp4, .mov, or .avi in the same folder) and open it in VLC. That file contains the actual footage.

IrfanView FREE

If you only want to see the thumbnail image, rename the .thm to .jpg and open it in IrfanView. This shows the still preview frame, not video.

About these formats

.THM Thumbnail Image (camera/camcorder video thumbnail)

A THM file is a small JPEG preview image that cameras, camcorders, and GoPros save automatically next to each video clip (e.g. GX010123.MP4 gets a GX010123.THM). Despite the extension, it…

Open .THM details →
.MP4 MPEG-4 Part 14 Video File

An MP4 file is a video container (MPEG-4 Part 14, standardized 2003) that holds video, audio, subtitles, and chapters in one file. It plays on every phone, computer, browser, and smart TV…

Open .MP4 details →

Quality & what to watch

  • The .thm file is only a thumbnail; it is not a reduced-size video and contains no footage.
  • GoPro clips include three files per recording: the full-resolution .mp4, a low-resolution proxy .lrv, and the thumbnail .thm. Only the .mp4 is the actual video.
  • You can safely delete .thm files to free space; they are not needed to play or edit the companion video.

Frequently asked questions

Can any converter turn a THM file into MP4?
No - the .thm file is a single still image with no video data. Any tool claiming to do this would produce an error or a single-frame output, not real footage.
I transferred files from my GoPro and only see .thm files - where are the videos?
The .mp4 files were likely not transferred. Reconnect the camera or SD card and copy the files from the DCIM folder.
Can I delete .thm files?
Yes - they are only thumbnails and are not needed to play or edit the companion video file.