Intent to Ship: JPEG XL decoding support (image/jxl) in blink

[Chromestatus]

Contact emails

hjanu...@gmail.com, vel...@chromium.org

Explainer

No information provided

Specification

https://www.iso.org/standard/85066.html

Summary

Adds support for decoding JPEG XL (image/jxl) images in Blink using jxl-rs, a memory-safe pure Rust decoder (https://github.com/libjxl/jxl-rs). JPEG XL is a modern image format standardized as ISO/IEC 18181 that offers progressive decoding for improved perceived loading performance, support for wide color gamut, HDR, and high bit depth, and support for animation.

Blink component

Internals>Images>Codecs>JPEG XL

Web Feature ID

jpegxl

Motivation

(see Summary)

Initial public proposal

No information provided

TAG review

https://github.com/w3ctag/design-reviews/issues/633

TAG review status

Issues addressed

Goals for experimentation

Risks

Interoperability and Compatibility

No special risks. Note that the C++ and the Rust version are both tested against the same conformance test corpus.

Gecko: Shipped/Shipping also migrating to rust version

WebKit: Shipped/Shipping WebKit currently uses the C++ decoder.

Web developers: Strongly positive

Other signals:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?

New feature, no special risk

Debuggability

No information provided

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?

Yes

Is this feature fully tested by web-platform-tests?

Yes
https://wpt.fyi/results/jpegxl?label=experimental&label=master&aligned There is extensive conformance testing outside of WPT too. WPTs show failures because the flag is disabled in wpt runs. https://wpt.fyi/results/jpegxl?sha=3d06a34791fc33532baffe64e5c48c450cb1a1b9 shows a run with the flag enabled, which has two failures. The icc-uncommon-profile-reftest.html failure is a small difference visually, currently investigating. The cmyk-basic-conversion-reftest.html failure is being fixed in https://chromium-review.git.corp.google.com/c/chromium/src/+/8275513

Flag name on about://flags

enable-jxl-image-format

Finch feature name

JXLImageFormat

Rollout plan

Will ship enabled for all users

Requires code in //chrome?

False

Availability expectation

Feature is available on Web Platform Baseline within 12 months of launch in Chrome.

Adoption expectation

Feature is considered a best practice for some use case within 12 months of reaching Web Platform baseline.

Adoption plan

Multiple players on the web have expressed interest in deploying JPEG XL images, including at least Cloudinary and Shopify, as well as multiple web developers during the Interop process.

Non-OSS dependencies

Does the feature depend on any code or APIs outside the Chromium open source repository and its open-source dependencies to function?

No.

Estimated milestones

No milestones specified

Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way).

N/A

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5114042131808256?gate=6594362739916800

This intent message was generated by Chrome Platform Status.

[Yoav Weiss (@Shopify)]

LGTM1

--
You received this message because you are subscribed to the Google Groups "blink-dev" group.
To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+...@chromium.org.
To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/6a8c2618.f0bac957.7b6f1.087d.GAE%40google.com.

[Yoav Weiss (@Shopify)]

I guess I can expand a bit more.. :)

This is an exciting addition to the web platform, that will enable improved image compression at reduced CPU costs on the encoding side. Thanks for pushing this through!!

[Vladimir Levin]

LGTM2. Similar to Yoav, I'm very excited for this feature 

To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAOmohS%2B1zzOXQ9DPn0za1HyMGmqkrs0DO9EfiUM62oH8fG0w4w%40mail.gmail.com.

[Mike Taylor]

LGTM3

To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CADsXd2PaJ-oMMAqmwjWV07RywDaec5AyFa-a6Xxf9FEy8J7ktQ%40mail.gmail.com.

[Luca Versari]

Mozilla also sent an intent to ship: https://groups.google.com/a/mozilla.org/g/dev-platform/c/3YMV4MS34KA

(sorry if you receive this email twice, my previous attempt at sending it from another address was deleted from the mailing list archive)

On Mon, Aug 24, 2026 at 1:29 PM Luca Versari <vel...@google.com> wrote:

Intent to ship from Mozilla: https://groups.google.com/a/mozilla.org/g/dev-platform/c/3YMV4MS34KA

[Luca Versari]

Intent to ship from Mozilla: https://groups.google.com/a/mozilla.org/g/dev-platform/c/3YMV4MS34KA

On Monday, August 24, 2026 at 1:08:20 PM UTC+2 Chromestatus wrote: