Nikon's NEF raw format needs converting before it will open in Messages, Mail or most photo apps. Filemorph turns a NEF into a shareable JPG right on your iPhone.

NEF is Nikon's raw format, produced by every Nikon DSLR and mirrorless camera, and like other camera raw formats it is built for editing detail, not for opening in everyday apps. Import a card full of NEFs onto your iPhone and none of them will preview properly in Messages or most photo viewers until they are converted.
Filemorph decodes the NEF using ImageIO's raw image support and renders it as a standard JPG on-device, using the camera's baseline processing of the raw sensor data.
In the app: Convert → To JPEG.
JPG opens in every app on your phone; NEF does not. Convert to JPG whenever you need to share, post or quickly review a shot from a Nikon camera without waiting to get to a computer with raw-editing software.
Yes. Unlike web converters that upload your files to a server, Filemorph converts every file locally using Apple's frameworks. Nothing leaves your device, and it works with no internet connection. This conversion is in the free tier.
Yes. Import the card through Files or a card reader, then convert directly on your iPhone or iPad.
The conversion uses the raw data's baseline rendering. Some cameras embed their in-camera picture profile in the NEF and it may be reflected; for precise control, edit the raw file in dedicated software first.
Yes, it is in Filemorph's free tier.
Free, on-device, no upload. Plus 300+ more file operations.
Download on theApp Store