JPEG XL (JXL) is a modern image format with lossy and lossless encoding, progressive rendering, animation, transparency, HDR, and a distinctive ability to recompress existing JPEGs losslessly and later restore the exact original JPEG bitstream. Its feature set is broad, but browser support remains uneven: a browser’s version and configuration matter, so websites should provide a fallback and test their audience’s actual devices.
What JPEG XL is
JPEG XL is an image coding system standardized as ISO/IEC 18181. It supports both lossy and lossless encoding, as well as lossless recompression of existing JPEG images. In that last workflow, a JPEG can be transcoded to JXL and later reconstructed as the exact original JPEG bitstream—a useful property for some archival and migration needs. The JPEG organization’s overview describes the format as designed for responsive web delivery and professional photography.
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JXL can also carry a broad range of image and metadata capabilities: progressive coding, animation, alpha transparency, layers, thumbnails, wide color gamut, HDR, and high bit depth. Its box-based file format can carry metadata such as EXIF and JUMBF. The reference software is described by the JPEG organization as free, open source, and royalty-free.
The organization characterizes compression ratios as “typically 20:1 to 50:1,” but that is a general design characterization, not a promise for a particular image or a direct comparison with AVIF or WebP. Results depend on the source, encoder, settings, and acceptable image quality.
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JPEG XL benefits
- Lossless JPEG migration: It can reduce storage for existing JPEGs while retaining the ability to reconstruct the original JPEG bitstream exactly.
- Progressive rendering: A decoder can display a developing image before all image data has arrived, potentially useful for large images where early visual feedback matters.
- Flexible image features: Animation, transparency, layers, HDR, wide gamut, and high bit depth make the format capable of workflows beyond ordinary web photographs.
- Lossy and lossless modes: The same format family covers different fidelity and storage requirements, though actual results must be measured for the intended images.
JPEG XL drawbacks
- Uneven browser support: Some current browser versions are supported, while others are marked disabled by default, partial, or unsupported. Sites cannot assume every visitor can decode JXL.
- Software support varies: Image applications and libraries may support opening but not exporting, or may implement only part of the format. Confirm support in the precise application version and workflow you use.
- No universal file-size winner: JXL does not consistently produce smaller files than AVIF or WebP. The outcome changes with image content, encoder settings, and target quality.
- Fallbacks add operational work: A website serving JXL needs an alternative representation or server-side content negotiation for clients without usable support.
JPEG XL vs. AVIF: which should you use?
There is no winner for every image. Compare encodings using representative files from your site, at the quality level you consider acceptable, and account for the delivery and decoding behavior you need.
| Consideration | JPEG XL | AVIF |
|---|---|---|
| Lossy photographic examples | In Jake Archibald’s Mozilla Hacks comparison, one image at SSIMULACRA 2 score 62.8 was 134 kB; another example at score 80 was 264 kB. | In the same article’s examples, the corresponding files were 116 kB at score 62.8 and 227 kB at score 80. These examples do not establish a general advantage. |
| Lossless examples | Two examples were 1.45 MB and 92 kB. | The corresponding AVIF examples were 1.76 MB and 164 kB. The outcomes are specific to those inputs and settings. |
| Progressive display | Progressive rendering can show an image as it downloads; Mozilla’s article notes this may justify a file-size cost for very large images. | The article describes basic progressive support. Whether that is sufficient depends on the use case. |
| Exact recovery of an existing JPEG | Lossless recompression can later reconstruct the exact original JPEG bitstream. | The cited JPEG XL capability is a specific advantage for JPEG migration and preservation. |
The figures above are examples from Jake Archibald’s August 24, 2026 Mozilla Hacks article, not a cross-image benchmark. Archibald summarizes the distinction this way: “JPEG XL: Excels at lossless imagery, progressive rendering, and further compressing JPEGs without quality loss.” He describes AVIF as excelling at web-quality photographic images and images mixing sharp edges with flat surfaces. These are his comparison statements, not a formal Mozilla standards position.
JPEG XL browser support in 2026
The following is a version-specific snapshot from Can I use, accessed October 3, 2026. The page identifies its browser usage-share data as August 2026. Support changes, and status labels do not mean every installation in a version range is necessarily configured identically.
| Browser | Status in the October 3, 2026 snapshot |
|---|---|
| Chrome desktop | Versions 155–157 supported; versions 145–154 disabled by default. |
| Firefox desktop | Versions 158–160 supported; versions 90–157 listed as disabled by default. |
| Safari | Versions 17 through 27.1 and Technology Preview marked partial support. |
| Edge | Version 154 listed as not supported. |
| Chrome for Android | Version 154 listed as disabled by default. |
| Safari on iOS | Versions 17 through 27.1 marked partial support. |
| Firefox for Android | Version 157 listed as unsupported. |
| Other listed mobile browsers | Not supported in the cited table entries. |
Can I use displays a combined global usage figure of 14.63%, with usage-share statistics attributed to StatCounter GlobalStats for August 2026. That is a browser-support-table figure, not an established measure of JPEG XL adoption or a guarantee that that share of visitors can successfully view JXL images.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteMozilla Hacks published an “Intent to Ship: JPEG XL” post on August 24, 2026. Its statement that Firefox intended to ship, and that Chrome also intended to ship, does not prove that every stable version has shipped support. For implementation decisions, use the version-specific table and verify current browser behavior at deployment time.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Should you use JPEG XL on a website?
Consider JXL when its specific strengths matter—such as progressive rendering for very large images or lossless JPEG archive migration—and when your own tests show useful results. For routine web image delivery, do not replace existing formats based on a general claim that JXL is smaller or better: the cited comparisons vary by image and encoding mode.
- Choose representative files. Include the actual image types visitors encounter, such as photographs, graphics, and images with sharp edges or flat areas.
- Encode at comparable visual quality. Compare JXL with the formats you already deliver using settings and quality targets appropriate to your site.
- Measure the trade-offs. Check file size, visual output, decode behavior, and whether progressive rendering matters for the image’s dimensions and use.
- Provide a fallback. Use responsive image markup or server-side negotiation to offer a format supported by clients that cannot decode JXL.
- Test real clients. Check the browser versions and devices your visitors use, including the precise partial-support cases relevant to your site.
Checking software support beyond browsers
The libjxl software-support list includes examples spanning image libraries such as ImageMagick and libvips, metadata tools such as ExifTool and Exiv2, and some operating-system integrations, editors, and viewers. Treat it as a starting point rather than a guarantee: entries distinguish workflows such as opening and export, and feature coverage can vary. Verify the exact version and whether it supports the operation you need.
Or skip the browser setup
If your task is to capture a web page rather than evaluate an image codec in browsers, ScreenshotNeo offers a website screenshot API and MCP server. Its API returns a screenshot or PDF from one GET request; it is not a JPEG XL encoder or a substitute for testing JXL decoding. The example below requests a WebP screenshot, and the ScreenshotNeo documentation covers API options.
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Frequently Asked Questions
What does JXL stand for?
JXL is the common file-extension shorthand for JPEG XL.
Can I rename a .jxl file to .jpg to make it work in an older browser?
No. Changing the filename extension does not convert the image data; use a compatible image format or provide a fallback.
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