SK to AVIF Converter

Free SK to AVIF conversion — next-gen web images

Drop files here. 1 GB maximum file size or Sign Up
to
Facebook Amazon Microsoft Tesla Nestle Walmart L'Oreal

State-of-the-Art Codec

AVIF delivers the best compression ratios among web image formats. Your SK artwork gets a modern, efficient image upgrade.

Web-Optimized

AVIF produces tiny files that look great. Convert SK to AVIF for web pages that load fast without sacrificing visual quality.

Files Protected

SK uploads are deleted immediately after conversion. AVIF outputs are removed from Convertio servers within 24 hours.

How to convert SK to AVIF

1

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

2

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

3

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

About formats

SK is the native file format of Skencil (originally named Sketch), a free vector graphics editor for Linux created by Bernhard Herzog, with the first public release on October 31, 1998. Skencil holds historical significance as one of the earliest full-featured vector drawing applications written almost entirely in Python, with only performance-critical rendering components implemented in C. The SK file format uses a text-based, Python-like syntax to describe document structure — pages, layers, groups, and individual graphic objects are represented as nested statements with parameters specifying coordinates, colors, line styles, and transformations. The format supports Bezier curves, rectangles, ellipses, text objects with font specifications, imported raster images, gradient and pattern fills, and hierarchical grouping with affine transforms. One advantage is human readability — SK files can be opened in any text editor, making it possible to inspect, modify, or generate artwork programmatically using simple scripts. The Python-native structure also provides a benefit for automation: since Skencil itself is a Python application, the file format integrates naturally with scripting workflows for batch processing and procedural graphic generation. While Skencil's development slowed after the mid-2000s, its SK format became the foundation for the sK1 project, which extended the format and continued active open-source vector graphics development. SK files remain convertible through sK1, UniConvertor, and other open-source tools.
Developer: Bernhard Herzog
Initial release: October 31, 1998
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

Frequently Asked Questions

Why convert SK to AVIF?

AVIF is the newest web image format with exceptional compression. Converting SK to AVIF produces small files with outstanding visual quality.

What browsers support AVIF?

Chrome, Firefox, Opera, and Safari support AVIF. Browser adoption is strong and growing, making it a forward-looking choice.

How does AVIF compare to WEBP?

AVIF generally achieves better compression than WEBP — smaller files at equivalent quality. It supports HDR and wide color gamut too.

Does AVIF support transparency?

Yes — AVIF supports full alpha transparency along with HDR content, wide color gamuts, and both lossy and lossless modes.

Is this converter free?

Convertio provides free SK to AVIF conversion. Premium tiers add higher upload limits and faster processing.

Can I use AVIF on websites?

Absolutely — AVIF is designed for the web. It loads significantly faster than JPEG or PNG at similar visual quality levels.