G4 to FAX Converter

Free G4 to FAX conversion — browser-based tool

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Private & Secure

Uploaded G4 files are erased right after conversion. FAX results are automatically deleted within 24 hours.

Fax to Digital

Bridge the gap between legacy G4 encoding and FAX — preserve and modernize your fax document archive.

Nothing to Install

The G4 to FAX conversion happens in your browser — no software to download or configure on your device.

How to convert G4 to FAX

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

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

Let the file convert and you can download your fax 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

FAX is a generic image file extension associated with facsimile transmission formats standardized by the ITU-T (formerly CCITT), with the underlying Group 3 compression standard ratified in 1980. FAX files typically contain monochrome (1-bit, black and white) image data compressed using the Modified Huffman (MH) encoding defined in ITU-T Recommendation T.4, which assigns variable-length codes to run lengths of consecutive white or black pixels along each scanline. The standard resolution for Group 3 fax is 204x98 dpi (normal mode) or 204x196 dpi (fine mode), reflecting the capabilities of thermal and laser fax machines of the era. FAX files encountered digitally are often raw Group 3 encoded bitstreams or TIFF wrappers with CCITT Group 3 compression (TIFF compression tag 3). The Group 3 encoding scheme is highly efficient for typical business documents — pages with mostly white space and black text — achieving compression ratios of 10:1 to 20:1 compared to uncompressed bitmaps. One advantage is universal fax system compatibility: Group 3 encoding is the mandatory baseline for all fax machines worldwide, meaning FAX files contain data in exactly the format transmitted over telephone lines, preserving the original fax data without transcoding losses. The format's role in business communications history provides another dimension — billions of fax transmissions using this encoding moved legal documents, medical records, and business correspondence for decades, and archived FAX files represent an important documentary record. FAX images can be viewed and converted using LibreOffice, ImageMagick, GIMP, and standard document management systems.

Developer: ITU-T

Initial release: 1980

Frequently Asked Questions

Why convert G4 to FAX?

Converting between fax formats like G4 and FAX helps match the requirements of different fax software and devices.

How do I view a FAX file?

Use Windows Fax Viewer, IrfanView, or fax processing software to view FAX files.

Will my G4 content stay sharp in FAX?

Full resolution is preserved during G4 to FAX conversion. Text and graphics remain sharp and clear.

Is there a charge for G4 to FAX?

Basic conversions are free. Premium subscriptions provide priority processing and expanded daily capacity.

Can I process many G4 files in one go?

Absolutely — add several G4 files at once. Each gets its own FAX conversion and individual download link.

Are my uploaded files kept private?

Absolutely. Uploaded G4 files are deleted after conversion and FAX results are purged within 24 hours.

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Specific converters

PDF to FAX

JPG to FAX

PNG to FAX

DOCX to FAX

JPEG to FAX

XLSX to FAX

BMP to FAX

DOC to FAX

TXT to FAX

TIFF to FAX

XLS to FAX

HTML to FAX

ODT to FAX

XPS to FAX

WEBP to FAX

RTF to FAX

PICON to FAX

BIN to FAX

CSV to FAX

CUR to FAX

GIF to FAX

JPS to FAX

ABW to FAX

DBK to FAX

KWD to FAX

SXW to FAX

AW to FAX

3FR to FAX

ARW to FAX

AVIF to FAX