Image guides
How to Convert HEIC to BMP in Your Browser
HEIC is Apple's HEVC-based photo format, and BMP sits at the opposite end of the spectrum: no compression, no modern codec, just raw pixels. This guide walks through what actually happens during that conversion — how the image data is decoded and rewritten, what's lost along the way, and whether BMP is even the format you should be aiming for.
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How HEIC becomes BMP
- The browser's built-in decoder unpacks the HEIC container's HEVC-coded image data into a full grid of raw RGB pixel values — the same step your phone or computer performs to show you a thumbnail.
- If the HEIC holds more than one image, a burst sequence or a Live Photo's paired frames are both stored this way, each image is decoded separately, since HEIF containers keep images as independent entries rather than one continuous stream.
- Each decoded pixel grid is written into an uncompressed BMP structure: a file header, a DIB header describing width, height and bit depth, then the raw pixel rows in 24-bit RGB — no compression pass runs at any point.
- If more than one image was decoded, every resulting BMP is bundled into a single ZIP for download; a single-image HEIC produces just the one .bmp file.
What changes when you convert
HEIC's HEVC compression is discarded entirely. You're trading a codec built to store a photo efficiently for BMP's simplest possible representation — every pixel stored plainly, with no compression at all — which is why a 2–3MB HEIC photo can turn into a BMP several times that size at the same resolution.
BMP output here is always 24-bit RGB with no alpha channel, so if the source image had any transparency, it's flattened onto white rather than carried through.
EXIF and camera metadata — capture settings, GPS coordinates, orientation tags — attached to the HEIC don't make it into the BMP. BMP has no structure for storing that information at all.
When BMP is the right choice — and when it isn't
BMP earns its place when the destination is genuinely old: a legacy Windows utility, an embedded device, or a print pipeline that only accepts uncompressed bitmaps and nothing else. Outside those specific cases, having zero compression makes it an awkward everyday format.
If you're moving a HEIC photo into an archival or scanning-adjacent workflow, TIFF is usually the better uncompressed target since it can keep the alpha channel that BMP throws away. If the real goal is sharing or displaying the photo — a website, an app, social media — WebP or AVIF will produce a fraction of the file size at comparable quality. And if you just need a small icon pulled from the photo, ICO packages multiple sizes with real transparency in one file.
Limitations and privacy
HEIC's biggest real-world friction usually isn't about image quality at all — it's that plenty of non-Apple apps, older Windows versions, and some web platforms still can't open a .heic file directly, which is often the actual reason someone converts it in the first place. BMP sidesteps that compatibility problem completely, at the cost of a much larger file.
Multi-image HEIC files are fully decoded, nothing is silently dropped, but expect a ZIP of several BMPs rather than a single output. Conversion runs entirely in your browser; the file is never uploaded to Looty Tools servers.
Convert HEIC to BMP FAQ
- Why is the BMP file so much bigger than the original HEIC?
- HEIC uses HEVC compression to store the photo efficiently; BMP stores every pixel with no compression at all. Removing the compression, not adding detail, is what makes the file grow, often to several times the original size.
- Does converting HEIC to BMP keep the photo's metadata?
- No. EXIF data such as capture settings, GPS location, and orientation tags is not carried into the BMP — BMP has no structure to store it.
- What happens if I convert a Live Photo or burst HEIC?
- Every image in the file is decoded — a Live Photo or burst HEIC downloads as a ZIP containing one BMP per decoded image, not just the first one.
- Will the BMP keep transparency from the HEIC?
- No. BMP output is 24-bit RGB with no alpha channel, so any transparent areas are flattened onto a white background.
- Is my photo uploaded anywhere during conversion?
- No. Conversion runs locally in your browser and the file is never sent to Looty Tools servers.
Related guides
- HEIC vs JPEG vs PNGCompare HEIC, JPEG, and PNG for photos, transparency, file size, and compatibility so you can choose the right Image Converter output.
- Convert Images Without UploadingLearn what browser-local image conversion means on Looty Tools, what stays on your device, and how Image Converter avoids a conversion upload.
