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Pricing Blog

THM to JPG

Trying to open a THM as JPG? Here's the honest answer — and how to get a real image.

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

Why THM to JPG 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 JPG. 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.

What you can do instead

Convert THM to PNG

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

THM → PNG

Convert THM to TIFF

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

THM → TIFF
Private — never stored Fast & secure Unlimited & free

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Format details

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

Full nameThumbnail Image
Developed byCamera makers
Released—
Extension.thm
MIME typeimage/jpeg
TransparencyNo

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

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 nameJoint Photographic Experts Group
Developed byJPEG Group
Released1992
Extension.jpg
MIME typeimage/jpeg
TransparencyNo

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

Frequently asked questions

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.

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.

Once you have the real photos (JPG or HEIC), they convert cleanly to PNG or TIFF — free, no sign-up, no watermark.

Popular free tools

Image ConverterPNG to JPGHEIC to JPGWEBP to PNGResize ImageCrop ImagePNG to WEBPImage Compressor