Why HEIC instead of JPG for DNG output?

DNG (Digital Negative) is Adobe's open RAW format, introduced in 2004 as a vendor-neutral alternative to the proprietary formats that every camera-maker invented independently. Pentax, Leica, Sigma, and Hasselblad ship DNG natively; almost every other camera's raw file can be converted to DNG using Adobe's free DNG Converter. iPhones since 2016 also write DNG when shooting in ProRAW mode.

That last source makes DNG-to-HEIC a particularly natural conversion: an iPhone ProRAW capture is a 40–60 MB DNG, and converting it to HEIC brings it back to the compact format the phone would have produced in standard mode — a 2–5 MB file that slots straight into Apple Photos, with the developed look baked in. Lightroom archivists get the same benefit: a browsable, storage-efficient Apple-native library derived from their DNG masters.

The conversion applies a full RAW-processing pipeline: demosaicing, white balance, tone curve, and optional lens-correction metadata. DNG carries enough information to reproduce the original camera's intent, and HEIC's 10-bit colour support preserves noticeably more of the raw file's tonal range than an 8-bit JPG export would.

Reasons to convert DNG to HEIC usually come down to compatibility, file-size, or specific feature requirements. Common situations:

• An app or platform only accepts HEIC uploads.
• You need a feature unique to HEIC (e.g. transparency, vector scaling, animation, multi-page pages, etc.) that DNG doesn't provide.
• You're optimising file size — modern formats often produce smaller files than the older format you started with.
• You need a single archival format across a project so files behave consistently in the same viewer.

1. Open the DNG → HEIC tool on heic.now.
2. Drag your DNG file onto the drop zone, or click Select files. You can drop a whole folder of files at once.
3. The output is fixed to HEIC. If the format supports extra options (page size, transparency background, quality, EXIF stripping), tweak them in the right-hand panel.
4. Click Convert. The job runs on our server and finishes in a few seconds for typical photos.
5. Download the result. Files stay in storage for 24 hours and are then permanently deleted.

The entire flow is free for the first 10 jobs per day with no signup required. A free account doubles that quota; a premium plan removes the limit entirely.

• If your DNG came from an iPhone in ProRAW mode, expect a dramatic size drop: a 40–60 MB ProRAW DNG becomes a 2–5 MB HEIC at quality 90.
• DNG files from Adobe DNG Converter (re-wrapped from CR2/NEF/ARW/RAF) carry the original camera's metadata. The HEIC output matches what the source camera would have produced.
• For full RAW reprocessing control (highlight recovery, noise reduction), develop the DNG in Lightroom first and convert the export — the web pipeline applies sensible defaults, not custom edits.
• If you shoot Apple ProRAW, the DNG already includes Apple's Deep Fusion processing. The HEIC will reflect that — you don't need to add extra sharpening downstream.
• Keep the DNG as your master — the HEIC is a finished, lossy rendering and can't be re-developed later.