Iris

Iris is a fast & efficient image encoder built to help provide a more beautiful Web. Designed around the intricacies of the human visual system and thoroughly evaluated under industry-leading psychovisual metrics, Iris takes Web-first image compression technology to a new level.

Sun Peering Through Trees

Iris for WebP

In its speed class, Iris-WebP is the most efficient image encoder available. Images encoded with Iris-WebP look significantly better than those encoded with the reference WebP encoder, and Iris-WebP's performance outclasses encoders for slower, newer Web-first formats like AVIF. WebP support is also currently ubiquitous, and large websites serve billions of WebP images every single day.

Fast

Iris-WebP's slowest encodes are close to AVIF's fastest, making it faster than competing modern Web codecs while still delivering exceptional quality.

Efficient

Achieve up to 45% better compression than the best JPEG encoders, leading to faster page load times and greatly reduced bandwidth.

High Quality

Iris-WebP is designed with the human visual system in mind, allowing up to 26% better compression than the reference WebP encoder.

See the Difference

Click the buttons below to switch between different encoders. The image below comes from Daala's subset1 image test suite.

Encoded Jul 2025

Iris-WebP's visual performance is unparalleled. Designing lossy image compression around the human eye allows us to provide an encoder capable of delivering an uptick in quality of experience that users notice.

Metrics

The numbers below were aggregated using the Kodak Lossless True Color Image Suite using the SSIMULACRA2 metric.

Measured Oct 2025

Compared to libjpeg's encoder, Iris-WebP achieves over 77% better compression on average. Compared to the highly efficient jpegli, Iris is up to 45% better. Within the same WebP codec, Iris outperforms the reference WebP encoder included in libwebp by up to 26%.

Using Iris-WebP

A commercial license from Halide Compression means guaranteed ongoing support, as well as access to new Iris-WebP releases and maintenance fixes over time.

An Iris-WebP license is an investment in the future of web image compression in pursuit of a more beautiful web. If you'd like to use Iris today, send us an email!

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