Why convert THM to PNG?
A .thm file is a standard JPEG saved by cameras and camcorders as a video-clip preview thumbnail. PNG uses lossless compression and supports transparency, making it useful when you need to embed the thumbnail in a document or process it with a tool that requires .png input, though the limited resolution of the source is unchanged.
How to convert THM to PNG
IrfanView FREE
Drag the .thm file onto IrfanView or open it via File > Open (set filter to All files). Go to File > Save As and select PNG.
XnView MP FREE
Open the .thm file directly in XnView MP; go to File > Export and set the format to PNG. Batch conversion is supported via Tools > Batch Convert.
GIMP OPEN-SOURCE
File > Open the .thm file (GIMP identifies it as JPEG); then File > Export As with a .png filename and click Export.
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 →
.PNG
Portable Network Graphics
A PNG (Portable Network Graphics) is a lossless raster image format. Every modern OS, browser, and image app opens PNGs natively - just double-click. The most common questions are not about…
Open .PNG details →Quality & what to watch
- Converting to PNG makes the image lossless going forward, but cannot recover quality lost in the original JPEG compression.
- THM thumbnails are typically around 160×120 pixels; the PNG output will be that same small size.
- Standard PNG does not store EXIF metadata the same way JPEG does, so camera metadata may be lost during export.
Frequently asked questions
Can I just rename .thm to .png?
Why is my converted PNG so small?
.thm file is a low-resolution thumbnail (typically 160×120 px); that is all the pixel data available. The full video is in the companion .mp4 or .mov file.
