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Convert JPG to THM

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

There's no real "convert JPG 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 JPG into one. If you have a THM, just rename or convert it to .jpg to view it.

Format details

What is a JPG file?

JPG (JPEG) is a lossy raster format that compresses photographs into small files by discarding detail the eye barely notices — the most widely used photo format on the web and in cameras.

Full name
Joint Photographic Experts Group
Developed by
JPEG Group
Released
1992
Extension
.jpg
MIME type
image/jpeg
Transparency
No

How to open JPG opens in every browser, image viewer and editor with no special software.

Full JPG 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 JPG to PNG

Lossless with transparency — perfect for graphics, logos and screenshots.

JPG → PNG

Convert JPG to WEBP

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

JPG → 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 JPG to THM?
There's no point: THM is just a camera's JPEG thumbnail. If you need a thumbnail-style image, convert JPG to JPG.
What can I convert my JPG to instead?
JPG converts to JPG, PNG, WEBP, PDF and more — free and instant.