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Supports: DNG
DNG (Digital Negative) is Adobe's open RAW format, introduced in 2004 and built on the TIFF/EP standard. A DNG holds the unprocessed sensor data — typically 12 to 16 bit — so photographers can re-tune exposure, white balance, and color long after the shutter clicks. The trade-off is size: a single DNG from a modern phone or mirrorless camera runs 20-50 MB, and a day's shoot can fill several gigabytes. HEIC is Apple's filename for a HEIF container using HEVC compression, adopted as the iPhone default in iOS 11 (2017). It delivers roughly half the size of JPEG at equal quality, with optional 10-bit color, and is the native photo format across iPhone, iPad, Mac, and iCloud Photos. Common reasons to convert DNG to HEIC:
| Property | DNG (RAW) | HEIC |
|---|---|---|
| Compression | Lossless or uncompressed RAW | Lossy HEVC (very efficient) |
| File size (24 MP photo) | 20-40 MB | 2-4 MB |
| Bit depth | 12-16 bit per channel | 8 or 10 bit per channel |
| Editing flexibility | Full RAW control (exposure, WB, highlights) | Limited — image is already developed |
| Native viewer | Lightroom, Camera Raw, RawTherapee, darktable | iOS, iPadOS, macOS, Windows 10+ (with HEIF extension), Android 10+ |
| Year introduced | 2004 (Adobe) | 2017 (Apple iOS 11 adoption) |
| Best for | Editing, archival, RAW masters | iPhone / iPad viewing, iCloud storage, AirDrop |
| 500-photo shoot size | ~15 GB | ~1.5 GB |
| Preset | Visual quality | Size vs DNG | Best for |
|---|---|---|---|
| Highest | Visually identical at 100% zoom | ~10-15% of DNG | HEIC copies you may revisit closely |
| Very High (default) | Indistinguishable for normal viewing | ~7-10% of DNG | iPhone / iPad libraries, iCloud uploads |
| High | Indistinguishable at typical viewing distance | ~5-7% of DNG | Shareable proofs, AirDrop to clients |
| Medium | Minor softening on close inspection | ~3-5% of DNG | Casual sharing, social posts |
| Low / Lowest | Visible compression on detailed images | ~1-2% of DNG | Tiny previews, contact sheets |
Yes — that is the fundamental trade-off. DNG carries the unprocessed sensor data so you can re-tune exposure, white balance, and highlight recovery in Lightroom or Camera Raw. HEIC stores a developed image: the conversion bakes in your current settings. The professional workflow is to keep the DNG masters in cold storage (NAS or external drive) and convert HEIC copies for viewing, sharing, and Apple-device libraries. If you ever need to re-edit, go back to the DNG.
Almost. HEIF is the container format standardized by MPEG; HEIC is Apple's specific filename for HEIF using HEVC compression. The byte content is the same in most cases — iOS, macOS, and Windows treat them identically. We expose both targets so you can pick the extension your downstream tool expects. If you prefer the .heif extension, use DNG to HEIF instead; pick HEIC when you need the file to slot cleanly into Apple Photos, AirDrop, or anything that filters by extension.
Windows 10 and 11 support HEIC after installing the free HEIF Image Extensions from the Microsoft Store (Apple covers the codec license). macOS, iOS, and iPadOS open HEIC natively. Modern Android (10+) handles HEIC in the Photos / Gallery apps. Older Windows 7 / 8 systems and many Linux desktops still need a third-party viewer or codec. If your audience is mixed-platform or older, consider DNG to JPG instead for universal compatibility.
For typical 24-50 MP DNGs, expect roughly 90% reduction at the Very High preset. A 30 MB Pixel or Lightroom DNG lands around 2-3 MB as HEIC. Highly detailed scenes (foliage, fine fabric, busy backgrounds) compress slightly less; flat areas like sky or studio backdrops compress more. Choosing Highest preset roughly doubles file size compared to Very High but is closer to lossless visually.
Yes. EXIF metadata (camera model, lens, aperture, shutter, ISO, capture date, GPS) and embedded ICC color profiles transfer to the HEIC output. iPhone Photos and macOS Preview will read the right capture date so the photos slot into the correct chronological place in your library, and the color profile keeps tones consistent on Wide-Gamut and P3 displays.
HEIC tops out at 10 bits per channel (HEVC Main 10 profile), versus DNG's 12-16 bits. For viewing on phones and tablets the difference is invisible. For master archives where you may push tones aggressively in future edits, keep the DNG. Treat HEIC as a delivery format, not a master format.
Yes — drop in folder-fulls. Each DNG converts in your browser session (limited only by your CPU and memory) and downloads as a ZIP. For multi-gigabyte shoots, processing is browser-side so there's no upload bottleneck — the limit is your machine's RAM, not network bandwidth.
Yes. Drop the converted HEICs into Photos on Mac or import via the Photos app on iPhone / iPad and they appear as native HEIC images. Date-taken EXIF determines their slot in the timeline, so older DNGs land in the correct chronological place. Once they sync to iCloud, they show up at full resolution on every device signed into the same Apple ID.
Yes. HEIC is a one-way trip in editing terms — you cannot recover RAW headroom from a developed HEIC. Treat HEIC as a delivery / viewing format and DNG as the master archive. Cold-store the DNGs (external drive, NAS, cloud archive) and use HEIC copies for daily viewing, sharing, and iCloud sync.