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Pricing Blog

THM to MP4

Trying to open a THM as MP4? Here's the honest answer — and how to get a real image.

We can't convert THM to MP4 — an THM file can't be opened by any converter. Here's why, and what actually works.

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

Why THM to MP4 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 MP4. 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.

Private — never stored or used for AI training Fast & secureUnlimited & free

Related free tools

Image ConverterFree toolPNG to JPGFree toolHEIC to JPGFree toolWEBP to PNGFree tool
AI Effects

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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.

MP4 is the universal video container that plays on virtually every device and platform.

Full nameMPEG-4 Part 14
Developed byISO / MPEG
Released2001
Extension.mp4
MIME typevideo/mp4
TransparencyNo

MP4 plays in any browser and media player.

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, JPG or TIFF — free, no sign-up, no watermark.

Popular free tools

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