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Convert THM to JPEG

Trying to turn a THM into JPEG? Here's the honest answer — THM isn't a readable image format — and the steps that get you a real picture.

We can't convert THM to JPEG — an THM file can't be opened by any converter. Here's why, and what actually works.

Why THM to JPEG isn't possible

1

THM can't be decoded

THM is a proprietary/undocumented format that no image library or converter can decode, so it can't be read as a source file.

2

There's no picture to convert

Because nothing can read the THM container, there's no image data a converter can extract and re-save as JPEG. Any tool that claims to do it would just fail.

3

Get the original photos instead

The real photos an THM cache was built from live in your photo library or a backup. Export those (they'll be JPG or HEIC), then convert them — that's a conversion that works.

Format details

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 is a JPEG 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
.jpeg
MIME type
image/jpeg
Transparency
No

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

Full JPEG format guide

What you can do instead

Convert THM to PNG

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

THM → PNG

Convert THM to JPG

A small, universal photo format that opens everywhere.

THM → JPG

Convert THM to TIFF

Lossless and uncompressed — ideal for editing, archiving and print.

THM → TIFF

Frequently asked questions

Can any tool convert THM to JPEG?
No. THM is a proprietary thumbnail-cache blob that no image library can decode, so there's nothing to convert. Export the original photos and convert those instead.
How do I open an THM file?
THM files aren't meant to be opened directly. Recover the original images from your device's photo library or an iTunes/Finder backup, then work with those.
What can I convert to JPEG instead?
Once you have the real photos (JPG or HEIC), they convert cleanly to PNG, JPG or TIFF — free, no sign-up, no watermark.