G4 to XV Converter

Transform G4 files to XV — free online converter

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Legacy Format Bridge

G4 is a legacy format. Converting to XV brings your fax archives into modern, widely accessible formats.

Browser-Based Tool

Convert G4 to XV directly in your web browser. No desktop software, plugins, or downloads required.

Data Protection

Your G4 files are removed immediately after processing. Converted XV output is purged within 24 hours.

How to convert G4 to XV

1

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

2

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

3

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

About formats

G4 is a monochrome image format based on the ITU-T Group 4 facsimile coding standard (Recommendation T.6), ratified by the CCITT in 1984 as an improvement over Group 3 for use on error-free digital networks like ISDN rather than analog telephone lines. G4 files contain 1-bit image data compressed using exclusively two-dimensional Modified Modified READ (MMR) coding, where each scanline is encoded as a set of differences (changing elements) relative to the line above it. By eliminating the one-dimensional coding fallback and the end-of-line synchronization markers required by Group 3, G4 achieves 20-50% better compression ratios on typical document pages while producing a simpler, more regular bitstream. The format is most commonly encountered as a compression method within TIFF files (TIFF compression tag 4), where it became the standard archival format for scanned documents in enterprise document management, government records, and legal imaging systems. G4 compression is specified at 200, 300, or 400 dpi depending on the scanning application, with 300 dpi being the most common for archival-quality document imaging. One advantage is exceptional compression efficiency for document content: G4's two-dimensional prediction exploits the strong vertical correlation in text and line art pages, typically compressing a 300 dpi letter-size page to 30-50 KB — roughly half the size of equivalent Group 3 encoding. The format's entrenchment in document management infrastructure is another strength — G4 TIFF is the mandated format for many government digital records systems, court filing systems, and corporate archives, supported by every enterprise imaging platform.
Developer: ITU-T (CCITT)
Initial release: 1984
XV is an alternate file extension for the VIFF (Visualization Image File Format) developed by Khoral Research as part of the Khoros scientific image processing environment, which originated at the University of New Mexico around 1990. The .xv extension and the .viff extension refer to the same underlying format — a container with a 1024-byte header encoding image dimensions, data type (from single-bit to double-precision float and complex numbers), color space, band count, and optional spatial location metadata, followed by color map data and pixel values. The XV extension became common on systems where Khoros was installed alongside other X Window System tools, and in some research communities .xv was preferred over .viff as a shorter alternative. Khoros itself was a pioneering visual programming system where scientists assembled image processing pipelines by wiring together processing nodes in a graphical canvas — an approach that predated and influenced similar environments in MATLAB, LabVIEW, and commercial remote sensing packages. One advantage of the VIFF/XV format is its ability to store data at scientific precision levels — floating-point and complex number pixel values preserve measurement accuracy that would be lost in photographic formats limited to 8-bit or 16-bit integers, making it valuable for spectral analysis, computational physics output, and satellite imagery. The multi-band architecture provides another strength, allowing a single file to hold dozens of spectral channels from multispectral or hyperspectral sensors without splitting data across multiple files. XV files are supported by ImageMagick and can be converted to modern image formats for visualization or publication.
Developer: Khoral Research
Initial release: 1990

Frequently Asked Questions

Why convert G4 to XV?

XV is widely supported by image viewers and browsers — converting from G4 eliminates the need for fax tools.

What opens XV files?

Open XV files using XV image viewer, ImageMagick, or Khoros tools.

Does conversion affect image clarity?

Yes — text and line art from G4 files convert with full clarity. The XV output retains original sharpness.

Can I convert G4 to XV for free?

Yes — basic G4 to XV conversion is free. Premium tiers provide additional throughput and faster processing.

Does the converter support batch processing?

Batch conversion is supported. Upload several G4 files simultaneously and download each XV result.

How long does G4 to XV take?

Conversion usually completes in seconds. Cloud-based processing keeps everything fast regardless of your device.