Free JPEG XL Converter
Convert images to JPEG XL with bit-perfect lossless quality. The most advanced image format.
How to Convert an Image to JPEG XL
Upload Your Image
Drag and drop or click to browse. Supports JPEG, PNG, GIF, WebP, and HEIC input. JPEG files can be losslessly transcoded to JXL, preserving the ability to reconstruct the original JPEG byte-for-byte.
Optionally Edit
Before converting, you can resize, crop, rotate, or adjust DPI. All editing tools are available on this page. Skip editing if you want a pure format conversion with no pixel changes.
Convert to JPEG XL
Click convert and download your JXL file. JPEG XL offers the best lossless compression available and supports progressive decoding for faster web display.
Frequently Asked Questions
JPEG XL (JXL) is the newest image format from the JPEG committee, designed as the universal successor to legacy JPEG, PNG, and GIF. It offers the highest quality lossless compression of any image format, progressive decoding (images sharpen as they load), HDR and wide color gamut support, animation support (replacing GIF), and a unique feature: lossless transcoding of existing JPEG files that reduces their size by ~20% while allowing perfect reconstruction of the original JPEG.
JPEG XL has growing but currently limited browser support. Safari is the major browser that fully supports JXL (since Safari 17 on macOS Sonoma and iOS 17). Chrome removed its experimental JXL flag in version 110, though this decision remains controversial and may be revisited. Firefox has an implementation behind a flag. For production websites, serve JXL with a picture element fallback to AVIF, WebP, or JPEG. Desktop applications like Photoshop, GIMP, Krita, and ImageMagick all support JXL natively.
JPEG XL delivers the best lossless compression of any format and the highest quality at high bitrates. At very low quality settings, AVIF edges ahead slightly due to its video-codec heritage. At medium to high quality and lossless modes, JPEG XL is consistently superior. JXL also encodes and decodes significantly faster than AVIF. Compared to WebP, both AVIF and JXL are substantially better in every metric. JPEG XL's unique lossless JPEG transcoding and progressive decoding give it additional practical advantages that neither AVIF nor WebP can match.
Yes, this is one of JPEG XL's standout features. When you upload a JPEG file to SharpWebP and convert it to JXL, the tool can perform a lossless transcode that reduces the file size by approximately 20% while preserving the ability to reconstruct the original JPEG file bit-for-bit. This is mathematically reversible -- the original JPEG can be perfectly recovered from the JXL file. This makes JXL ideal for archiving photo libraries, reducing storage costs on servers, and future-proofing image collections.
Yes, SharpWebP's JPEG XL converter is free with no watermarks or quality restrictions. Free users can convert up to 5 images per day. JXL output depends on server-side encoding support, which SharpWebP detects automatically. If JXL encoding is not available on the server, the tool will suggest AVIF or WebP as the best alternative. Paid plans (starting at 499 INR/month) unlock batch JXL conversion, higher daily limits, and priority processing.