JXL to NEF Converter

About JXL

JPEG XL (JXL) is a next-generation image format standardised by ISO/IEC in 2022, developed as a long-term replacement for JPEG. It achieves up to 60% smaller file sizes than JPEG at equivalent visual quality and typically 20–35% smaller than AVIF or WEBP in photographic content. It supports both lossy and lossless compression, 32-bit HDR, wide colour gamuts (P3, Rec. 2020), alpha transparency, and animation.

Browser adoption is growing rapidly: Safari 17+ (2023), Chrome 91+ (lossless/transparent sequences), and Firefox 128+ support JXL natively. Google Photos uses JXL for archival storage, and Apple adopted it as the preferred export format in several iCloud contexts.

When to convert to JXL: When targeting modern browsers and archival quality with minimum file size. Professional photographers and developers storing large image libraries benefit significantly from JXL's superior compression. For delivery to the broadest possible audience today, WEBP or AVIF retain wider compatibility.

When to convert from JXL: When you need to use a JXL image in software, a website, or a service that does not yet support JXL — converting to JPG or PNG gives universal compatibility with no quality loss for lossless JXL sources.

About NEF

NEF (Nikon Electronic Format) is the proprietary RAW file format used by Nikon DSLR and mirrorless cameras, including the D3x00, D5x00, D7x00, D500, D750, D800, D810, D850 series, and the Z-series mirrorless line (Z50, Z5, Z6, Z7, and their successors). NEF files store the complete unprocessed sensor data at 12 or 14 bits per channel depending on camera model and quality setting, before any in-camera processing — white balance, sharpening, Picture Control profiles — is applied. This raw sensor data is the reason photographers choose RAW: it preserves the maximum dynamic range and color accuracy available from the sensor, allowing corrections in post-processing that would degrade a JPG.

The practical limitation of NEF is compatibility. NEF files require Nikon's ViewNX-i, Capture NX-D, Adobe Lightroom, or another RAW-capable editor to open. They cannot be displayed in browsers, email clients, social platforms, or most software outside the photography production chain. Converting to JPG produces a file that opens everywhere.

When NEF to JPG is the right call

Social media delivery, client handoff by email or Dropbox, web galleries, print labs that accept only JPG or TIFF — all require a processed output format. This converter provides a direct path from NEF sensor data to a ready-to-share JPG without installing Nikon's desktop software or opening a full editing workflow.

About this conversion

Conversion uses ufraw-batch to decode the NEF sensor data and Imagick to produce the output file. The decode applies default auto white balance and a linear tone curve, bypassing Nikon's Picture Control profiles (Vivid, Portrait, Landscape, Flat, etc.) and in-camera sharpening. The result is a technically correct, neutral-look render. For output that replicates the camera's in-camera JPEG with your chosen Picture Control applied, export from Nikon Capture NX-D or Adobe Lightroom.

File size note

Nikon NEF files range from 15–50 MB depending on sensor resolution and whether 12- or 14-bit capture is selected. Files from high-resolution bodies — D800, D810, D850 (24–45 MP) — frequently exceed the 20 MB upload limit on this site. In that case, enable lossy NEF compression in-camera (Nikon calls this "Compressed RAW" or "Lossy compressed"), reduce sensor resolution, or export from Nikon Capture NX-D at a reduced file size before uploading.