AVIF to G4 conversion is the process of transforming images encoded in the AV1 Image File Format (AVIF), a modern, high-efficiency raster image format, into the G4 (Group 4) fax-compatible CCITT compression format commonly used for bi-level (black-and-white) scanned images. This conversion typically involves color or grayscale downsampling and dithering to produce a 1-bit bilevel G4 image suitable for archival, fax transmission, or legacy document workflows.
Related guides
Practical guides to help you choose formats, preserve quality, and avoid common conversion problems.
WebP has quietly become the default image format of the modern web, delivering 25-35% smaller files than JPG and PNG with universal browser support. This 2026 guide covers current adoption stats, browser compatibility, WordPress integration, conversion workflows, and when to choose WebP over AVIF for optimal Core Web Vitals performance.
Read guide →Not sure whether to save your image as PNG or JPG? This detailed comparison covers compression, transparency, file size, web performance, and real-world use cases so you can pick the right format every time — with conversion links when you need to switch.
Read guide →Learn how to convert HEIC to JPG for maximum compatibility. This guide explains what HEIC is, why iPhones use it, the key differences between HEIC and JPG, and walks through every conversion method including online tools, iPhone settings, Windows, and Mac.
Read guide →Drag your .AVIF file from your computer or use the browse function.
Confirm .g4 as the selected destination format.
Click "Convert" and download your converted .G4 file once ready.
AVIF uses the MIME type image/avif and is based on the AV1 codec to deliver advanced compression for photographic images. G4 files typically use the MIME type image/g4 or are embedded within TIFF files, employing CCITT Group 4 compression, suitable for scanned documents and fax transmissions. Both formats serve distinct purposes, with AVIF excelling in color images and G4 in monochrome document encoding.
The G4 (.G4) format is commonly used for image. Understanding its characteristics can be helpful when converting to or from other formats like AVIF.
While specific technical details aren't available here, G4 files generally serve the purpose of storing image effectively within their domain.
Our online AVIF to G4 converter provides a seamless solution for converting AVIF images to the G4 format without any software installation. Designed for speed and quality, this tool supports high-resolution image conversions while maintaining optimal file size and clarity.
AVIF is a modern image format optimized for high-quality color images with efficient compression, ideal for web use. G4, on the other hand, is a compression standard mainly used for black-and-white images in fax and document scanning. While AVIF supports rich color depth, G4 focuses on reducing data size for monochrome imagery.
Keep source AVIFs under 250–300MB each for smooth browser-based conversion; large images may take longer or require server-side processing.
To preserve readable detail, convert AVIF to grayscale first and choose adaptive thresholding or error-diffusion dithering rather than a simple global threshold.
For document batches, normalize DPI (200–300 dpi) and pre-crop or deskew pages to reduce artifacts during bilevel conversion and improve OCR accuracy.
Note format limitation: G4 is strictly bilevel (1-bit) so color information and subtle gradients in AVIF will be lost; use preprocessing (contrast, denoise) to retain important edges.
This AVIF to G4 converter saved me a lot of time on document processing.
Emily R.
Photographer
Fast and reliable conversion with excellent output quality.
Mark D.
IT Specialist
Easy to use and works perfectly for my archival needs.
Linda S.
Graphic Designer
Start your free AVIF to G4 conversion now.
Drag your file here to to upload.
Up to 250MB
For archival or fax use, prefer lossless preprocessing and verify resulting filesize—G4 compresses well for text but may be larger for noisy scans.