Compress JPEG XL images — free, private, no upload
Re-encoded with libjxl in your browser. You see exact before/after sizes on every file.
About compressing JPEG XL
JPEG XL is the official successor to JPEG, finalized in 2021. It matches or beats AVIF on photographic quality per byte, encodes much faster, supports lossless mode, progressive decoding, HDR, and can even recompress existing JPEGs losslessly ~20% smaller. Safari supports it natively and Chrome re-added support in 2025 behind its Rust decoder; adoption is growing but not yet universal — check your target platform before shipping JXL.
How to compress JPEG XL
- 1Drop JPEG XL files above — batches are fine, and nothing is uploaded.
- 2Pick a quality (80 is visually lossless for photos). The output format stays the same unless you change it.
- 3Watch each file’s size drop, then download individually or as a ZIP.
JPEG XL strengths & limitations
Strengths
- Excellent quality-per-byte, fast encoding
- Lossless mode and lossless JPEG recompression
- HDR, wide gamut, up to 32-bit per channel
Limitations
- Browser support still settling (Safari yes; others rolling out)
- Little support in desktop tools so far
- Ecosystem momentum currently favors AVIF
Frequently asked questions
How does JPEG XL compression work here?+
Your JPEG XL is decoded and re-encoded at the quality you choose using libjxl, entirely in your browser.
What quality setting should I use for JPEG XL?+
Quality 80 is the sweet spot for photos — visually identical to the original for almost everyone. Use 60–70 for thumbnails and previews, 90+ only when you plan to edit the image again later.
Is there a limit on file size or number of images?+
No hard limits: processing runs on your own device, so the only constraint is your browser’s memory for truly gigantic images. Batch as many files as you want.
Will compressing JPEG XL remove metadata?+
Yes. Output files are built from raw pixels, so EXIF data — GPS location, camera model, timestamps — is stripped. Orientation is baked into the pixels first so photos stay upright. This usually saves a few extra kilobytes too.
Are my images uploaded anywhere?+
No. The codecs run as WebAssembly in your browser; the page works offline once loaded. Files, previews and results all live in your device’s memory only.