AVIF to SIX Converter

Online AVIF to SIX conversion — free and straightforward

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Compatibility Bridge

AVIF offers cutting-edge compression but limited support — converting to SIX ensures your images work across all platforms and applications.

Runs in the Cloud

All processing for AVIF to SIX happens remotely on Convertio servers, keeping your own hardware free for other tasks.

Quick Results

Most AVIF to SIX conversions finish within moments — the entire upload, conversion, and download process takes well under a minute.

How to convert AVIF to SIX

1

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

2

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

3

Let the file convert and you can download your six 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
SIX is a file extension for SIXEL (Six Pixel) graphics data, a bitmap graphics format developed by Digital Equipment Corporation (DEC) in 1983 and introduced with the LA50 dot matrix printer. SIXEL encodes images as a sequence of printable ASCII characters, where each character represents a column of six vertical pixels (a 'sixel') — the character's ASCII value minus 63 provides a 6-bit binary pattern, with each bit controlling one pixel in the vertical column. The encoding is structured as a series of sixel bands (each six pixels tall) across the image width, with control sequences for color selection (up to 256 registers with HLS or RGB specification), repeat counts (run-length encoding for efficiency), carriage return, and newline commands. SIXEL data is transmitted to the output device using DEC's standard escape sequence protocol, embedded within the text stream alongside regular character output. Originally designed for DEC's line of printers and later supported by DEC VT-series terminals (VT240, VT330, VT340), SIXEL has experienced a remarkable revival in modern terminal emulator software. One advantage is terminal-native image display: SIXEL allows images to be rendered directly within a text terminal session without requiring a graphical window system, enabling command-line tools to display graphs, photographs, and previews inline with text output. This capability has driven adoption in modern terminals like mlterm, xterm, WezTerm, and foot. SIX/SIXEL data can be generated by ImageMagick, libsixel, and chafa, and viewed in any SIXEL-capable terminal emulator.
Initial release: 1983

Frequently Asked Questions

Why convert AVIF to SIX?

SIXEL graphics render images directly in terminal emulators — useful for command-line workflows, remote sessions, and terminal-based image viewing.

How do I open SIX files?

SIXEL-compatible terminals (mlterm, xterm), ImageMagick. Most modern operating systems also have built-in support or free viewer options available.

Will my AVIF image look the same as SIX?

The visual appearance is preserved as closely as the SIX format allows. Any differences are typically imperceptible to the human eye in normal viewing.

Is batch AVIF to SIX conversion available?

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

Can I convert AVIF to SIX for free?

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

Are my files safe during conversion?

Convertio uses encrypted connections for all transfers. Your AVIF uploads are deleted immediately after conversion, and SIX downloads are removed within 24 hours.