DNG to G3 Converter

Convert your DNG images to G3 online for free

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Browser-Based Tool

No apps or plugins to install. Your DNG to G3 conversion happens right in the browser — accessible from any modern device.

Private & Secure

Your uploaded DNG images are deleted immediately after conversion. The G3 output is removed within 24 hours — your DNG photos stay private.

Cross-Platform

Run the DNG to G3 converter on any device — desktop, laptop, tablet, or smartphone. All you need is a browser and internet access.

How to convert DNG to G3

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose g3 or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your g3 file right afterwards

About formats

DNG (Digital Negative) is an open, royalty-free RAW image format published by Adobe Systems on September 27, 2004, designed to address the proliferation of incompatible proprietary RAW formats from different camera manufacturers. Based on the TIFF/EP standard (ISO 12234-2), DNG provides a well-documented container for raw sensor data with standardized metadata tags that describe the camera's color filter array pattern, color calibration matrices, default rendering parameters, and opcodes for geometric corrections. The format supports both original raw mosaic data and linear (demosaiced) DNG, as well as lossy DNG using JPEG compression for smaller archive sizes when full quality is not critical. Adobe has iterated the specification through multiple versions, adding support for transparency maps, floating-point HDR data, enhanced color profiles, and semantic masks in newer revisions. One advantage is archival reliability — DNG's published, non-proprietary specification eliminates the risk that a camera manufacturer's format becomes unreadable when that company exits the market or drops support for older models, a concern that motivated Adobe's creation of the format. The format also enables embedded original RAW data, letting users convert their CR2, NEF, or ARW files to DNG while optionally keeping the original bits inside the DNG for reversibility. Broad ecosystem support is another strength: Adobe Lightroom, Photoshop, and Camera Raw treat DNG as a first-class format, and many smartphone manufacturers (including Google and Apple for certain modes) output DNG natively.
Developer: Adobe Systems
Initial release: September 27, 2004
G3 is a monochrome image format based on the ITU-T Group 3 facsimile coding standard (Recommendation T.4), ratified by the CCITT in 1980 as the universal compression method for fax transmission over telephone networks. G3 files contain 1-bit (black and white) image data encoded using Modified Huffman (MH) one-dimensional coding, where each scanline is independently compressed by replacing runs of consecutive white or black pixels with variable-length codewords from a predefined Huffman table optimized for typical document content. The standard also defines an optional two-dimensional coding mode (Modified READ) that encodes each line as differences from the previous line, achieving better compression for pages with vertical redundancy. Standard G3 resolution is 204 pixels per inch horizontally and either 98 (standard) or 196 (fine) pixels per inch vertically, producing the characteristic slightly-stretched appearance of received fax documents. The encoding was carefully optimized for the real-time transmission constraints of 1980s modems operating at 2400 to 14400 bps, where encoding and decoding speed had to match the communication channel rate. One advantage is universal telecommunications compatibility: Group 3 encoding remains the mandatory baseline codec for every fax machine manufactured, ensuring that G3 image data can be transmitted to or received from any fax device worldwide. The format's efficiency for document content is another strength — the Huffman tables were statistically tuned to the run-length distributions found in business documents, and typical pages compress to under 30 KB. G3 files are supported by LibreOffice, ImageMagick, and fax server software.
Developer: ITU-T (CCITT)
Initial release: 1980

Frequently Asked Questions

Why convert DNG to G3?

Fax systems require specific encoding formats like G3. Converting from DNG creates fax-ready images for document transmission.

What programs open G3?

G3 is supported by fax software, IrfanView, and Group 3 fax-compatible tools.

Is registration required?

No account is needed for basic DNG to G3 conversions. Just open the converter, upload your DNG photo, and download the result.

Do I need to install software?

No installation required. The DNG to G3 converter runs entirely in your web browser — just upload, convert, and download the result.

Is my DNG file safe during conversion?

Uploaded DNG files are deleted immediately after conversion. G3 output files are removed from servers within 24 hours for your privacy.