BMP to HEIC Converter
Convert BMP to HEIC in your browser. BMP files usually come from Windows Paint, legacy Windows programs, embedded displays and some scanners; HEIC is the better fit for storing photos on Apple devices. You get a HEIF file whose picture is JPEG-compressed rather than HEVC, because no HEVC encoder runs in a browser. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
BMP expected · other image formats also work
How to use BMP to HEIC
- 1
Add your BMP files: drop them here, choose them, or paste from the clipboard.
- 2
Pick the colour that replaces transparent areas, since HEIC has none.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .heic files one at a time or together as a ZIP.
Why use Aback Images for bmp to heic
Where the HEIC goes next
HEIC opens in Apple devices, recent Android phones, and Windows with the HEIF and HEVC extensions.
HEIC next to BMP
A lossy HEIC usually comes out far smaller than the BMP, which stores usually none; RLE for some 4 and 8-bit files.
The first lossy pass
The BMP holds 1, 4, 8, 16, 24 or 32 bits per pixel with nothing discarded yet. This conversion is the first lossy encode these pixels see, and hard edges and flat colour show it first.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
BMP vs HEIC
What changes from BMP to HEIC
Encoding: the BMP uses usually none; RLE for some 4 and 8-bit files; HEIC uses lossy HEVC (H.265) intra coding, on iPhones as a grid of 512×512 tiles, and the download is a HEIF file whose picture is JPEG-compressed rather than HEVC, because no HEVC encoder runs in a browser.
Bit depth: 1, 4, 8, 16, 24 or 32 bits per pixel in the BMP; HEIC allows 8 or 10 bits per channel, and the HEIC written here has 8 bits per channel.
Colour: RGB or an indexed palette in the BMP; HEIC supports YCbCr, usually tagged Display P3 on iPhones, written here as 8-bit sRGB.
Transparency: the BMP stores it as an optional fourth byte in 32-bit files, which many programs ignore; HEIC could hold it as an auxiliary image item, rarely used by cameras, but this writer flattens it, so transparent areas are filled with the colour you choose.
Metadata: the BMP can carry nothing beyond the header's resolution fields (and a colour profile in rare V5 headers); HEIC can carry EXIF, XMP and an ICC profile, stored as items, but nothing is copied across.
About BMP
BMP stores raw, uncompressed pixels. Files are huge but trivially simple, which is why some legacy Windows software, embedded displays and printers still ask for it.
A BMP is a 14-byte file header ('BM' and the offset to the pixels), a DIB header (40 bytes, or 108 and 124 bytes in the V4 and V5 versions that add colour masks and alpha), an optional palette, then pixel rows padded to 4 bytes and normally stored bottom-up.
BMP files usually come from Windows Paint, legacy Windows programs, embedded displays and some scanners.
About HEIC
HEIC is the default photo format on iPhones and many Android phones. It is about half the size of JPEG, but Windows, many websites and older software cannot open it without converting.
A HEIC is a HEIF file (ISO base media boxes with the brand 'heic'). iPhone photos store the picture as a grid of 512×512 HEVC tiles that the decoder stitches together, with the thumbnail, depth map and HDR gain map as further items.
When converting BMP to HEIC makes sense
HEIC is the better choice for storing photos on Apple devices, while BMP suits legacy software and embedded systems that require it.
HEIC strengths: About half the size of JPEG; Stores depth maps, Live Photos and HDR. Drawbacks to weigh: Not supported by most websites and Windows apps; Patent-encumbered codec.
Limitations
- BMP stores nearly every pixel literally, so almost any compressed target is several times smaller.
- A 32-bit BMP can carry an alpha byte that most programs ignore; if the image suddenly gains transparent areas after converting, that byte was set.
- The file is a valid HEIF, but its picture is JPEG-coded rather than HEVC, so apps that expect HEVC (Apple Photos, Windows' HEVC extension) may not open it.
- The picture inside is JPEG-coded, so the file is about the size of a JPG at the same quality rather than the half size of a camera HEIC.
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Frequently asked questions
Does converting BMP to HEIC lose quality?
HEIC is lossy, so detail the eye barely notices is discarded to save space.
What happens to transparency when converting BMP to HEIC?
BMP stores transparency as an optional fourth byte in 32-bit files, which many programs ignore. HEIC has no alpha channel, so transparent pixels are composited onto a solid colour, white unless you pick another. To keep transparency, convert to PNG, WebP or AVIF instead.
Will the HEIC open in Apple Photos?
Not always. The file is a valid HEIF container, but its picture is JPEG-compressed rather than HEVC, because no HEVC encoder can run in a browser. libheif-based apps such as GIMP, darktable and ImageMagick open it; Apple Photos and Windows' HEVC extension expect HEVC and may refuse it. For an iPhone, JPG is the safer choice.
Which apps open HEIC files?
Apple devices, recent Android phones, and Windows with the HEIF and HEVC extensions. It opens in Safari on recent Apple systems; other browsers do not display it.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.