ITHMB to BMP

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

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

What you can do instead

Why ITHMB to BMP isn't possible

1

ITHMB can't be decoded

ITHMB is Apple's private iPod/iPhone thumbnail-cache format. It isn't a standard image file — it's an internal database of many tiny preview images packed together with no public specification, so no image library or converter can decode it.

2

There's no picture to convert

Because nothing can read the ITHMB 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 ITHMB 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.

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Format details

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. ITHMB 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.

ITHMB 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.