Convert images to JPEG XL in your browser

What this tool does

This converter turns JPG/JPEG, PNG and WebP images into JPEG XL (.jxl), the image format standardised by the JPEG committee as ISO/IEC 18181. You can also ask for WebP and AVIF versions of the same image and compare the file sizes side by side.

Three things make it different from most online converters:

1. Nothing leaves your device. The conversion code is WebAssembly built from libjxl, the reference JPEG XL library, running inside your browser. There is no upload step and no server that sees your photos.
2. JPG files are not re-encoded. By default a JPEG is recompressed losslessly: libjxl repackages the existing compressed data instead of decoding and re-encoding pixels. No quality is lost, and the original JPEG file can be reconstructed byte for byte. After each conversion the tool checks this in your browser and tells you if it succeeded.
3. You see the real result. For every file you get the original size, the new size and the percentage change — including when the new file is larger. In that case the tool recommends keeping the original instead of hiding the result.

How to convert an image to JPEG XL

1. Drop your images on the box above, tap Choose images, or paste an image from the clipboard.
2. Optionally open Settings to change the mode, add WebP or AVIF output, or remove location data.
3. Wait for each file to finish. Large images can take a few seconds; keep the tab open.
4. Download each file, or download everything at once as a ZIP.

A longer walkthrough, including tips for phones, is in the how-to guide.

Modes explained

Mode	What it does	Best for
Auto	Lossless for JPG and PNG, visually lossless for lossy WebP	Most people
Lossless / reversible	JPG: lossless recompression, restorable to the exact original. PNG/WebP: every pixel kept	Archives, originals, graphics
Visually lossless	Re-encodes pixels at high quality; differences should not be visible	Photos from lossy sources
Balanced	Smaller files with slight quality loss	Web pages where size matters most
Custom	You pick quality and effort	Experiments

Re-encoding an image that is already lossy (a JPEG or lossy WebP) in a pixel mode cannot bring back detail that was lost, and the result is not always smaller. That is why JPG files default to lossless recompression.

What happens to metadata

By default the converter keeps EXIF (camera settings, date, orientation), XMP and the colour profile. You can choose Remove location (GPS) or Remove all metadata before converting. After each conversion a short metadata report lists what was kept, what was removed and anything that could not be kept in this version — for example, an embedded colour profile in a PNG is converted to sRGB rather than copied. The report only claims what the converter actually did.

Is JPEG XL right for you?

JPEG XL is well suited to archiving photos, keeping high-quality originals smaller, and lossless graphics. Browser support has been changing quickly in 2026, so check which browsers display JPEG XL before using it as the only format on a website. If you want to understand the format first, start with what JPEG XL is, or read our comparison of JXL, WebP and AVIF.

Last updated: 2026-10-17