Turn big BMP bitmaps into small HEIC images for iPhone, iPad and Mac - for files that open everywhere pick BMP to JPG instead.
Need to look inside the result? The HEIC Analyzer shows its size, colour layout and metadata.
A BMP keeps every pixel raw, so a 12-megapixel photo weighs about 36 MB.
As a HEIC at quality 85 the same photo is often under 1.5 MB.
HEIC is the format iPhones and iPads save photos in. It drops straight into Apple Photos, iCloud and AirDrop and saves a lot of storage.
| BMP | HEIC | |
|---|---|---|
| Compression | None (or simple RLE) | HEVC (H.265), lossy |
| Typical photo size | 36 MB (12 MP) | 1-2 MB at quality 85 |
| Transparency | Only 32-bit, patchy support | Yes, alpha plane |
| Opens natively on | Windows, Paint | iPhone, iPad, Mac, Windows 11 with the HEIF extension |
| Best for | Legacy software, raw pixels | Apple devices, photo libraries, saving space |
Need a file every app opens? BMP to JPG is the safe choice. For websites, BMP to AVIF and BMP to WebP are better fits.
Your browser opens the BMP, so 16-bit, RLE and OS/2 bitmaps all work - even ones other converters reject.
Browsers cannot write HEIC, so the decoded image goes to our server as a lossless PNG over HTTPS. ImageMagick encodes the HEIC and the file is deleted the moment it is downloaded. Anything left over is swept within a few hours.
The size you see after converting is measured from the real HEIC, not guessed.
Wondering what is inside your bitmap first? The BMP Analyzer shows every header field.
Drop your BMP files into the box, keep quality 85 or pick a preset, and press Convert to HEIC.
One file downloads as a HEIC, more than two come as a ZIP.
Yes, for this format. Browsers cannot write HEIC, so the image is sent to our server as a PNG over HTTPS, converted and deleted as soon as you download it. Leftovers are removed within a few hours.
Usually 95-98% smaller for photos. A 36 MB bitmap often becomes a 1-2 MB HEIC at quality 85.
The exact size is measured from the real file after converting.
Yes. The alpha channel of a 32-bit BMP is stored in the HEIC. Pick Fill background if you want a solid colour instead.
Windows 10 and 11 open HEIC with the free HEIF and HEVC extensions from the Microsoft Store. You can also preview them with our HEIC File Viewer or convert back with HEIC to JPG.
85 is the default and looks like an iPhone photo. Go 90-95 for prints and archives, or 60-75 for small previews.
1, 4, 8, 16, 24 and 32-bit BMP and DIB files, uncompressed or RLE4/RLE8, with bitfields, V4/V5 headers, top-down rows and OS/2 headers. Images up to 40 megapixels can be encoded.
Up to 50 BMP files per batch. Recent conversions stay in this browser, so you can download them again later.