GIF to G4 Converter

Convert GIF images to Group 4 fax compression online

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Efficient Fax Encoding

Group 4 achieves better compression than Group 3 on most documents — smaller files for archival, storage, and transmission.

Enterprise Document Standard

G4 is the standard compression in enterprise scanning, document management, and TIFF/F archives worldwide.

Online Processing

No fax or scanning tools needed. Convertio encodes the G4 file on its servers — upload the GIF and download the result.

How to convert GIF to G4

1

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

2

Choose g4 or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your g4 file right afterwards

About formats

GIF (Graphics Interchange Format) was introduced by CompuServe on June 15, 1987 as a platform-independent image format for transmitting color graphics over the CompuServe online service's modem-speed connections. The format uses LZW (Lempel-Ziv-Welch) lossless compression on indexed-color images with a palette of up to 256 colors selected from a 24-bit RGB color space. GIF's most distinctive capability is animation: multiple image frames can be stored sequentially within a single file, each with independent delay timing, disposal methods, and local color palettes, enabling short looping animations without any video codec or player. The format also supports binary transparency (one palette entry designated as fully transparent) and interlaced display for progressive rendering. GIF became synonymous with web culture — animated GIFs proliferated across early websites, messaging platforms, and social media, evolving into a communication medium in their own right. One advantage is universal animation support — GIF animations play natively in every web browser, email client, messaging app, and social platform without plugins, codecs, or compatibility concerns, a level of ubiquity no other animation format has achieved. The lossless compression on palette-based images provides another strength: graphics with flat colors, text, and sharp edges (logos, diagrams, UI elements) compress efficiently without the artifacts that affect JPEG. Although the LZW patents that once threatened GIF's use expired in 2004, and newer formats like WebP and AVIF offer superior compression with full-color animation, GIF's cultural entrenchment keeps it irreplaceable for casual animated content.
Developer: CompuServe
Initial release: June 15, 1987
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

Frequently Asked Questions

Why convert GIF to G4?

Group 4 compression is more efficient than Group 3 — producing smaller fax files for document archival, TIFF/F embedding, and enterprise scanning systems.

What uses G4 files?

Document management systems, enterprise scanners, TIFF/F archives, and fax infrastructure use Group 4 encoding for maximum bi-level compression.

How is G4 different from G3?

G4 uses two-dimensional compression (referencing adjacent lines) while G3 is primarily one-dimensional — G4 achieves better ratios on most documents.

Is G4 monochrome?

Yes — Group 4, like Group 3, encodes bi-level (black and white) images. Color from the GIF is converted to a monochrome threshold.

Is G4 lossless?

Yes — Group 4 compression is fully lossless. The original bi-level pixel data is preserved exactly in the compressed output.

GIF to G4 Quality Rating

4.3 (9 votes)
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