JXL Converter
FileFlip converts JXL files into 61 other formats entirely inside your browser, using ImageMagick, MuPDF and Pandoc compiled to WebAssembly. The JXL file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. There is no file-size limit and no account to create.
How do I convert a JXL file?#
- Drop your JXL file onto the converter at the top of this page, or click it to pick one from your computer.
- Choose the format you want out of it. FileFlip downloads the engine that conversion needs, once, and your browser caches it.
- Conversion starts the moment you pick the format, and the result is yours to download. The work happens in this tab, so nothing is uploaded and nothing is queued.
Is it safe to convert JXL files online?#
Yes, because nothing is uploaded. FileFlip converts JXL files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What happens to a JXL file#
FileFlip converts JXL into 61 formats with ImageMagick, MuPDF and Pandoc, all of it inside the browser tab. Each conversion below names the engine it uses, what it downloads, and exactly what that conversion keeps or drops.
| Category | Image Files |
|---|---|
| File extension | .jxl |
| FileFlip support | Read and written |
| Conversions available | 61 |
| Engines | ImageMagick, MuPDF and Pandoc |
| Downloaded to your browser | 14.1 MB on the first conversion, then cached |
What is a JXL file?#
A JXL file stores an image under the JPEG XL coding system, a format built to losslessly repackage an existing JPEG into a smaller file or to encode a new photo at higher quality per byte than JPEG, WebP or AVIF.
Use JPEG XL for archiving and photo libraries where you want smaller files than JPEG without giving up the option to reconstruct the original JPEG exactly, especially once Chrome and Firefox finish rolling out default decoding.
Convert JXL to JPEG or PNG for anything going on the web today, since most browsers still require a manual flag to display JPEG XL directly.
The JXL file format reference covers the specification, the programs that open one, and what each conversion keeps or drops.
JXL questions people ask#
What is a JXL file?
A JXL file is an image encoded with JPEG XL, a format from the JPEG standards committee designed either to losslessly shrink an existing JPEG or to encode new photos at better quality per byte than JPEG, WebP or AVIF. It became an ISO standard starting in 2021.
Do browsers support JPEG XL yet?
Safari has supported JPEG XL natively since version 17. Chrome and Firefox restored decoding support during 2025 and 2026 but keep it behind an experimental flag as of August 2026, with both browsers targeting default support around September 2026.
Why did Chrome remove JPEG XL support?
Chrome shipped an experimental JPEG XL decoder starting in 2021 but removed it in version 110, released December 2022, citing limited ecosystem interest at the time. Chrome brought decoding back behind a flag starting with version 145 in early 2026 as adoption grew.
Can I convert a JPEG to JXL without losing quality?
Yes. JPEG XL has a lossless transcoding mode built specifically to repackage an existing JPEG's data into a smaller JXL file, and the process can be reversed to get back the exact original JPEG bytes. This is different from lossy JXL encoding, which re-compresses the image and is not reversible.
What opens JXL files right now?
On macOS, Preview and Photos read JXL natively since Sonoma. On Windows and Linux, GIMP 3.0 and later, ImageMagick, IrfanView and XnView MP all open it, and recent Photoshop and Affinity releases support it too. Most web browsers still need a manual flag enabled, or the file converted to JPEG or PNG for immediate use online.