Convert HEIC to BMP Online

BMP (Bitmap) is Microsoft's original raster image format, dating back to Windows 1.0. It stores image data uncompressed by default - Every decoded pixel is written to the file directly with no size-reduction algorithm applied. Converting a HEIC to BMP therefore trades the most efficient mainstream photo format for the least efficient one: expect the BMP to be 15–30× larger than the source HEIC.

BMP's lack of compression is both its weakness and its strength. There is zero decoding overhead, making BMP trivial to read and write in embedded systems, drivers, and applications that need raw pixel data without the complexity of a codec. It is also the required input for some older Windows software, screensaver tools, and certain industrial control systems - Environments that will never gain HEIC support.

For virtually all modern use cases - Web, email, sharing, archiving - PNG is a strictly better alternative to BMP: it is lossless, compresses to 30–50% smaller files, and is universally supported. Choose BMP only when a specific application or workflow explicitly requires it.

BMP (Bitmap) was introduced by Microsoft and IBM in 1990 with the launch of OS/2 and Windows 3.0. The format stores raw pixel data with minimal headers, making it trivial for early hardware to decode without floating-point maths or complex codecs. BMP became the default image format on Windows for over a decade and is still embedded in fonts (DIB sections), cursor files, clipboard payloads and industrial HMI panels. It is the polar opposite of HEIC: where HEIC demands a licensed HEVC decoder that many Windows machines lack, BMP can be parsed by a few dozen lines of C — which is exactly why iPhone imagery bound for legacy or embedded systems gets converted this way.

BMP conversion is most often needed when feeding photos into older Windows applications, embedded systems, or industrial software written before modern compressed formats became standard. Many legacy printing systems, machine interfaces, and hardware control panels accept only uncompressed BMP input - And none of them can decode HEIC.

Because BMP stores raw uncompressed pixels, it also serves as a lowest-common-denominator interchange format: any tool from any decade can read it. Converting a HEIC to BMP guarantees the image opens in software where even JPG support is uncertain.

The cost is size - A 12-megapixel photo becomes roughly 36 MB as a 24-bit BMP. Use BMP only when the destination specifically requires it; for general legacy compatibility, HEIC to JPG produces a far smaller file that almost everything can open.