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JPEG XL Converter

Convert your images to JPEG XL — the next-generation format that is up to 60% smaller than JPEG with no quality loss.

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Open JXL Converter →

Select JPEG XL output format with Smart quality preset

JPEG XL Converter — Free, Fast & Private

JPEG XL is the newest image format designed to replace JPEG, PNG, and even WebP. Developed by the JPEG committee and finalized in 2022, it offers dramatically better compression — typically 30-60% smaller than JPEG at the same visual quality — while also supporting lossless compression, transparency, animation, and HDR content in a single format.

Browser support has reached a turning point in 2026. Chrome 145 shipped JPEG XL support (initially behind a flag, expected to be on by default in H2 2026), and Firefox 152 adds native JXL support on June 16, 2026. Safari has supported JPEG XL since version 17. This means all three major browser engines now handle JXL.

What makes JPEG XL particularly interesting is its backward compatibility. You can losslessly transcode an existing JPEG into JPEG XL and reduce its file size by about 20% without any quality degradation whatsoever. The original JPEG can be perfectly reconstructed from the JXL file. No other modern format offers this trick.

For photographers and designers, JPEG XL supports up to 32-bit colour depth, wide gamut colour spaces, and up to 4096 layers. For web developers, it delivers file sizes comparable to AVIF but with faster encoding and decoding speeds — roughly 10x faster than AVIF to decode.

MiniPx converts your images to JPEG XL entirely in your browser. Your files never leave your device. Upload a JPEG, PNG, or WebP and get a smaller JXL file in seconds.

How it works

  1. Upload your image: Add a JPEG, PNG, or WebP file that you want to convert to JPEG XL format.
  2. Select JXL output format: Choose JPEG XL from the format dropdown. Adjust quality preset — Smart works well for most images.
  3. Convert and download: MiniPx converts your image to JXL in the browser. Download the result — typically 30-60% smaller than the original.
  4. Verify browser support: JPEG XL works in Safari 17+, Chrome 145+, and Firefox 152+. For older browsers, keep a WebP or JPEG fallback.

Frequently asked questions

What is JPEG XL?
JPEG XL is a next-generation image format standardized in 2022 by the JPEG committee. It compresses images 30-60% better than JPEG while supporting features like transparency, animation, HDR, and lossless compression. It is designed as the universal replacement for JPEG, PNG, GIF, and WebP.
Which browsers support JPEG XL in 2026?
Safari has supported JPEG XL since version 17 (2023). Chrome 145 added support in early 2026 (behind a flag, default-on expected H2 2026). Firefox 152 adds JXL support on June 16, 2026. Combined, this covers over 90% of browser traffic.
Is JPEG XL better than WebP?
Yes, in most ways. JPEG XL produces files 20-35% smaller than WebP at the same quality. It also supports higher bit depths, more colour spaces, lossless JPEG recompression, and decodes significantly faster. WebP is more widely supported today, but JXL is catching up quickly.
Is JPEG XL better than AVIF?
They are comparable in compression efficiency, with AVIF sometimes winning on very small file sizes and JPEG XL winning on larger images. The main advantages of JXL over AVIF are: 10x faster encoding and decoding, progressive loading, lossless JPEG recompression, and support for very high resolution images without tiling artifacts.
Can I convert JPEG to JPEG XL without quality loss?
Yes. JPEG XL has a unique lossless transcoding feature that takes an existing JPEG and recompresses it into JXL with zero quality degradation — typically saving 20% of the file size. The original JPEG can be perfectly reconstructed from the JXL file.
Should I switch my website to JPEG XL?
If your audience uses modern browsers (Safari 17+, Chrome 145+, Firefox 152+), yes. Use the HTML picture element to serve JXL with a WebP or JPEG fallback for older browsers. This gives you the best of both worlds — smaller files for supported browsers, compatibility for everyone else.
How much smaller is JPEG XL compared to JPEG?
At equivalent visual quality, JPEG XL files are typically 30-60% smaller than JPEG. A 1MB JPEG photo might become 400-700KB in JPEG XL with identical perceived quality. For lossless transcoding (no quality change), the saving is around 20%.
Is it safe to convert images to JXL on MiniPx?
Yes. MiniPx processes everything in your browser — your images are never uploaded to any server. The conversion runs locally using your device, making it the most private way to convert to JPEG XL.

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