NEF to JPG Converter

Nikon cameras store NEF (and, on Coolpix models, NRW) raw files together with a JPEG the camera rendered itself, using the Picture Control, white balance and Active D-Lighting you shot with. That JPEG is what this tool gives you: it reads the NEF structure, finds the largest embedded JPEG and saves it as a normal .jpg that any phone, website or office app opens. It runs in your browser, so your photos never leave your device.

How to use this tool

1. Drop one or more .nef or .nrw files into the box.
2. Keep the lossless option to copy the camera JPEG exactly, or choose re-encode for a quality setting and a maximum size.
3. Look at the table: "Full size" says whether the embedded JPEG has the camera's full resolution.
4. Download the JPGs one by one or as a ZIP.

Formula

NEF = TIFF structure (usually big-endian "MM"). IFD0 holds a small thumbnail and the SubIFDs tag (0x014A); one SubIFD carries JpgFromRaw through JPEGInterchangeFormat / JPEGInterchangeFormatLength (tags 0x0201 / 0x0202), the other the compressed sensor data.

If the directories give nothing usable, the file is searched for JPEG start markers (FF D8 FF) and each hit is followed to its end marker. The largest JPEG the browser can decode is used; the camera's orientation is applied through an Exif tag (lossless) or by rotating the pixels (re-encode).

Example

Many Nikon models store the JpgFromRaw at full resolution — 6000 × 4000 px for a 24-megapixel camera. The table then shows "Full size: Yes" and the JPG is the camera JPEG byte for byte. If a model stores a smaller JpgFromRaw, the note says, for example, "reduced preview: the camera image is 6048 × 4024 px", so you know a RAW converter is needed for full resolution.