# dnglab-online

> Free, fully client-side RAW → DNG converter that runs in the browser. Converts
> Canon CR3/CR2, Nikon NEF, Sony ARW, Fujifilm RAF, and dozens of other native
> camera RAW formats to Adobe DNG 1.4 without uploading anything to a server.

dnglab-online is a WebAssembly build of the open-source `rawler` library
(part of the `dnglab` project, LGPL-2.1) wrapped in a multilingual web UI. All
RAW decoding, white-balance matrix processing, and LJPEG-92 lossless DNG
encoding happen inside the browser sandbox; the bytes never leave the user's
machine. Hosted on Cloudflare Workers as a static site. No login, no payment,
no upload, no tracking beyond a single Google Analytics 4 page-view tag (which
visitors can opt out of via the cookie banner).

The site is published by **NeoAnalogLab**, an open-source imaging-tools lab.
The product name is **dnglab-online**. Source code:
<https://github.com/lexluthor0304/dnglab-online>.

Trilingual: Chinese (`/zh/`), English (`/en/`), Japanese (`/ja/`). The default
language served at the root is Chinese, with Accept-Language detection.

## How it works

- User drops a RAW file (or clicks to pick) into the dropzone on the homepage.
- A Web Worker fetches `rawler-wasm.wasm` (≈6–10 MB, cached after first visit).
- `rawler` decodes the RAW, applies the camera's calibration matrix, and writes
  a standard Adobe DNG 1.4 file (LJPEG-92 lossless by default; uncompressed
  optional). Optional embedded preview and thumbnail.
- The browser auto-starts a download of the resulting `.dng`.
- Typical timings on a modern laptop: 30 MB CR3 → 1–3 s; 100 MB CR3 → 5–15 s;
  120 MB α7R V ARW → 15–25 s. WASM is single-threaded, so 4–10× slower than the
  native `dnglab` CLI for batch work.

## Who it's for

- Photographers whose camera RAW format isn't yet supported by their installed
  Adobe DNG Converter (older Lightroom, brand-new EOS/α body).
- Linux/BSD users — Adobe DNG Converter is Windows/macOS only.
- Anyone wanting a single conversion done quickly without installing a Rust
  toolchain or Debian package, or without trusting a closed-source online
  converter with their copyrighted RAW.
- Archive-focused users converting CR3/NEF/ARW to a long-term, vendor-neutral
  format (Adobe DNG, openly published since 2004).

## Pages

- [Home / Tool](https://dng.neoanaloglab.com/en/): the converter itself.
- [Supported cameras](https://dng.neoanaloglab.com/en/cameras/): full list of
  supported camera bodies, generated from the upstream `rawler` calibration
  database.
- [Canon CR3 → DNG guide](https://dng.neoanaloglab.com/en/guides/cr3/): why CR3
  needs DNG conversion, step-by-step, troubleshooting.
- [Sony ARW → DNG guide](https://dng.neoanaloglab.com/en/guides/arw/): ARW
  compression modes, timings per body, FAQ.
- [vs Adobe DNG Converter / dnglab CLI](https://dng.neoanaloglab.com/en/compare/):
  feature matrix and "which should I use" decision tree.
- [FAQ](https://dng.neoanaloglab.com/en/faq/): privacy, supported cameras,
  conversion times, browser requirements, Lightroom compatibility, batching,
  metadata.
- [About](https://dng.neoanaloglab.com/en/about/): project background and
  credits to the upstream `dnglab` / `rawler` maintainers.
- [Privacy](https://dng.neoanaloglab.com/en/privacy/), [Terms](https://dng.neoanaloglab.com/en/terms/),
  [Cookies](https://dng.neoanaloglab.com/en/cookies/).

## What it is not

- Not an editor. There is no exposure / colour / curve UI; the tool only
  decodes a RAW and re-encodes it as DNG.
- Not a batch processor. v1 handles one file at a time. For batches, use the
  upstream `dnglab` CLI (<https://github.com/dnglab/dnglab>).
- Not a converter for delivery formats (HEIF/HIF, JPEG, TIFF) — only camera
  RAW files. HIF/HEIF on Sony α1/α7S III is already 8-bit, so DNG conversion
  isn't meaningful.
- Not a fork of `rawler`'s decoding logic. Decoders are upstream-unchanged;
  this fork only adds a wasm-bindgen wrapper, the trilingual frontend, and
  Cloudflare Worker routing.

## Pricing

Free. No account required. No paid tier. No "contact sales" gate. See
[/pricing.md](https://dng.neoanaloglab.com/pricing.md) for the canonical
machine-readable version.

## Licensing

LGPL-2.1, inherited from upstream `dnglab` / `rawler`. The output DNG files
themselves are owned by the user; the tool does not assert any rights over
converted images.