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Convert PNG to THM

Curious about PNG to THM? Here's what THM actually is — and why there's nothing to convert.

There's no real "convert PNG to THM" — a THM file is simply a JPEG thumbnail a camera writes alongside a photo or video.

About THM files

1

THM is a JPEG with a different extension

A .thm file is a small JPEG thumbnail cameras save next to a photo or video so devices can preview it quickly. Its contents are identical to a JPG — only the extension differs.

2

Nothing needs converting to it

Because THM is created automatically by the camera, there's no use case for turning a PNG into one. If you have a THM, just rename or convert it to .jpg to view it.

Format details

What is a PNG file?

PNG is a lossless raster format with full transparency. It keeps every pixel intact, making it ideal for logos, icons, screenshots and graphics with sharp edges.

Full name
Portable Network Graphics
Developed by
PNG Development Group
Released
1996
Extension
.png
MIME type
image/png
Transparency
Yes

How to open PNG opens in every browser and image viewer, plus Photoshop, GIMP, Preview and Photos.

Full PNG format guide

What is a THM file?

THM is a small JPEG thumbnail saved alongside camera photos and videos — really a JPEG with a different extension.

Full name
Thumbnail Image
Developed by
Camera makers
Released
—
Extension
.thm
MIME type
image/jpeg
Transparency
No

How to open Rename or convert THM to .jpg to open it anywhere.

Full THM format guide

What you can do instead

Convert PNG to JPG

A small, universal photo format that opens everywhere.

PNG → JPG

Convert PNG to WEBP

A modern format with small files at high quality for the web.

PNG → WEBP

Frequently asked questions

How do I open a THM file?
Rename it to .jpg, or convert it — it's a JPEG, so any image viewer will then open it.
Can I convert PNG to THM?
There's no point: THM is just a camera's JPEG thumbnail. If you need a thumbnail-style image, convert PNG to JPG.
What can I convert my PNG to instead?
PNG converts to JPG, PNG, WEBP, PDF and more — free and instant.