AVIF to G3 Converter

Free online AVIF to G3 converter with instant results

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Quality Preserved

Convertio maintains maximum visual fidelity when transforming AVIF to G3 — your images retain their clarity through the conversion process.

Effortless Process

Converting AVIF to G3 takes just a few clicks. The clean, intuitive interface makes format conversion accessible to everyone.

Bulk Conversion

Need to convert dozens of AVIF files? Upload them all and batch-convert to G3 — much faster than processing one at a time.

How to convert AVIF 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

AVIF (AV1 Image File Format) is a modern image format derived from the AV1 video codec, developed by the Alliance for Open Media and specified in February 2019. The format leverages the intra-frame coding tools of AV1 — a royalty-free video codec backed by Google, Apple, Microsoft, Amazon, Netflix, and other major technology companies — to compress still images with substantially higher efficiency than JPEG, PNG, or even WebP. AVIF stores images in the HEIF (High Efficiency Image File Format) container, supporting both lossy and lossless compression, HDR (high dynamic range) with wide color gamuts up to 12-bit depth, alpha transparency, and animated sequences. At equivalent visual quality, AVIF files are typically 30-50% smaller than WebP and 50-70% smaller than JPEG, representing the largest compression improvement in mainstream image formats in over a decade. One advantage is exceptional compression efficiency — AVIF delivers visually indistinguishable images at dramatically lower file sizes, directly reducing bandwidth consumption and improving page load times for web content. The royalty-free licensing model provides another key strength: unlike HEIC/HEIF which relies on patent-encumbered HEVC, AVIF's AV1 foundation is free for anyone to implement without licensing fees. Browser support has reached broad adoption, with Chrome, Firefox, Safari, and Edge all rendering AVIF natively. The format is rapidly gaining adoption for web images where quality-to-size ratio is paramount.
Initial release: February 8, 2019
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 AVIF to G3?

Group 3 encoding compresses your image for fax protocol transmission — the standard format used by fax machines worldwide.

How do I open G3 files?

fax machines, HylaFAX, GIMP, ImageMagick. Most modern operating systems also have built-in support or free viewer options available.

How quickly does AVIF to G3 conversion finish?

Most conversions complete within seconds. Larger files may take slightly longer, but cloud processing keeps it fast regardless of your device.

Is batch AVIF to G3 conversion available?

Absolutely — upload multiple AVIF files simultaneously and convert them all to G3 at once. Batch mode saves considerable time on repetitive conversions.

Is my AVIF file safe during conversion?

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

Can I convert AVIF to G3 for free?

Yes — Convertio offers free AVIF to G3 conversion. For professional volumes and larger files, premium plans provide expanded limits and priority processing.