JPG to DNG Converter
Convert JPG to DNG in your browser. JPG files usually come from cameras, phones, scanners and almost every app that saves photos; DNG is the better fit for raw editing and archiving raw files in an open format. You get a Linear DNG: demosaiced 8-bit RGB with the colour matrices raw editors need. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
JPG expected · other image formats also work
How to use JPG to DNG
- 1
Add your JPG files: drop them here, choose them, or paste from the clipboard.
- 2
There is nothing to tune: the DNG is written uncompressed. Resizing and rotating are under More options if you need them.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .dng files one at a time or together as a ZIP.
Why use Aback Images for jpg to dng
Where the DNG goes next
DNG opens in Lightroom, Photoshop Camera Raw, Capture One, darktable, RawTherapee, Affinity Photo and macOS Photos.
DNG next to JPG
The DNG is written uncompressed, so expect it to be several times larger than the JPG, which stores lossy DCT coding in 8×8 pixel blocks, with colour usually stored at half resolution.
No new artefacts
JPG is already lossy, since it stores lossy DCT coding in 8×8 pixel blocks, with colour usually stored at half resolution; the DNG keeps the decoded pixels uncompressed, so this step adds no compression damage of its own.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
JPG vs DNG
What changes from JPG to DNG
Encoding: the JPG uses lossy DCT coding in 8×8 pixel blocks, with colour usually stored at half resolution; DNG uses lossless (or lossy) JPEG-compressed sensor data, plus optional JPEG previews, and the download is a Linear DNG: demosaiced 8-bit RGB with the colour matrices raw editors need.
Bit depth: 8 bits per channel in the JPG; DNG allows 8 to 16 bits per channel, and the DNG written here has 8 bits per channel, linearised.
Colour: YCbCr shown as RGB, greyscale, or CMYK from print software in the JPG; DNG supports camera RGB plus the colour matrices that map it to XYZ (demosaiced linear RGB in a Linear DNG), written here as 8-bit sRGB.
Metadata: the JPG can carry EXIF (camera, date, GPS), XMP, IPTC and an ICC profile in APP segments; DNG can carry EXIF, XMP and DNG tags for colour matrices, calibration and lens corrections, but nothing is copied across.
About JPG
JPEG is the universal photo format. It compresses by discarding fine detail the eye is least sensitive to, which makes photos small but blurs sharp edges and text if pushed too far.
A JPEG starts with the bytes FF D8 and is a run of marker segments: APP1 carries EXIF and often a thumbnail, APP2 an ICC profile, DQT the quantization tables that decide the quality, and SOS the compressed scan, which ends at FF D9.
JPG files usually come from cameras, phones, scanners and almost every app that saves photos.
About DNG
DNG is Adobe's openly documented raw format. Some cameras and phones record it directly, Adobe DNG Converter turns other brands' raw files into it, and a Linear DNG holds already-demosaiced RGB that raw editors treat like any other raw file.
DNG is built on TIFF/EP. The raw image sits in a sub-IFD marked as the main image, with tags for black and white levels, colour matrices and the colour filter pattern; a Linear DNG (PhotometricInterpretation 34892) stores demosaiced RGB instead of a mosaic. Previews are optional, and Adobe DNG Converter can write a medium (1024 px), full-size or no preview.
When converting JPG to DNG makes sense
DNG is the better choice for raw editing and archiving raw files in an open format, while JPG suits photographs that need to open anywhere.
DNG strengths: Open specification read by every raw editor; Lossless compression and optional previews; Recorded directly by Leica, Pentax, DJI drones and phones. Drawbacks to weigh: Large files; No browser or ordinary photo viewer support on every platform.
Limitations
- JPEG artefacts already in the file, such as blocking near edges and smeared colour, are kept as pixels: a lossless target preserves them faithfully rather than removing them.
- The DNG holds the decoded 8-bit pixels, so it adds no dynamic range or detail beyond the JPG.
- Raw editors apply their own default profile and tone curve to a DNG, so it can look slightly different from the source until you adjust it.
- A Linear DNG has no sensor mosaic, so demosaicing settings in your raw editor have no effect on it.
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Frequently asked questions
Does converting JPG to DNG lose quality?
DNG is written uncompressed, so the pixels are stored exactly as decoded. Artefacts already in the JPG stay, but nothing new is lost.
Can Lightroom edit this DNG like a camera raw file?
It opens with the full raw controls in Lightroom, Photoshop Camera Raw, Capture One and darktable, because it is a valid Linear DNG. It holds the decoded 8-bit pixels, though, so it has no more dynamic range or detail than the image it came from.
Which apps open DNG files?
Lightroom, Photoshop Camera Raw, Capture One, darktable, RawTherapee, Affinity Photo and macOS Photos. It does not open in web browsers.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.