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THM to BMP

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

We can't convert THM to BMP — 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 BMP 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 BMP. 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.

BMP is an uncompressed raster format that stores pixel data with no quality loss, producing large files. It is common on Windows.

Full nameBitmap Image File
Developed byMicrosoft
Released1990
Extension.bmp
MIME typeimage/bmp
TransparencyNo

BMP opens in most image viewers and editors on Windows and Mac.

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