JPEG XL Explained: The Image Format of the Next Decade
Smaller than AVIF, faster to encode, lossless, HDR-capable — and able to shrink your existing JPGs without losing a pixel. What JPEG XL is, where browser support stands in 2026, and when to switch.
What is JPEG XL, in 30 seconds?
JPEG XL (.jxl) is the royalty-free successor to JPEG, standardized in 2022. One format replaces four jobs: photos ~60% smaller than JPG at equal quality, true lossless mode, HDR and wide color, transparency, animation, and progressive loading. Its superpower is unique: it can repack your existing JPGs ~20% smaller and rebuild them bit-for-bit — a free diet for photo archives.
| JPG | WebP | AVIF | JPEG XL | |
|---|---|---|---|---|
| Size vs JPG | Baseline | −25–35% | −50% | −60% (lossy) / −20% (lossless JPG) |
| Lossless mode | No | Yes | Yes | Yes — best in class |
| HDR / wide color | No | No (8-bit SDR) | Yes | Yes (up to 32-bit) |
| Progressive loading | Yes | Weak | No | Yes — responsive by design |
| Animation | No | Yes | Patchy | Yes |
| Encode speed | Instant | Fast | Slow (5–6× WebP) | Fast |
| Royalties | Free | Free | Free | Free |
| Browser support ’26 | Universal | ~97% | ~93% | Rolling out (Safari + Chrome H2) |
The killer feature: shrink JPGs without touching a pixel
Every photo library on earth is mostly JPG. JPEG XL's lossless transcoding repacks each one ~20% smaller — and decoding the .jxl reconstructs the exact original bytes. No quality decision, no risk, no re-shoot: a 100 GB archive becomes ~80 GB for free. Neither AVIF nor WebP can do this; converting JPG→AVIF always re-compresses (and usually degrades). If you manage archives, this one feature justifies learning the format.
Also Apple-adjacent: your iPhone already brushes against it
Apple adopted JPEG XL inside ProRAW-adjacent workflows, and iPhone photos increasingly carry HDR and wide-gamut data that JPG and WebP simply cannot store. JXL keeps all of it — which is why it's the right archival master for modern phone photography even before browsers finish catching up.
Should you switch? (Decision guide)
Archiving photos — any size library
Yes, now. Lossless-transcode JPGs (~20% free savings) and keep new masters in JXL for HDR/wide-color preservation. Zero quality risk.
Website images in 2026
Prepare, don't commit. Ship AVIF + WebP today; add JXL as the first <source> in your <picture> element so supporting browsers self-upgrade with zero fallback risk.
Sharing with people (message, email, upload forms)
Stay JPG/WebP. Recipients' viewers and upload pipelines don't speak JXL yet — compatibility beats compression for files that travel.
Photography masters from mirrorless / ProRAW
JXL lossless. ~48% smaller than PNG, keeps HDR and 16-bit depth, royalty-free forever. It's what the format was designed for.
JPEG XL FAQs
What is JPEG XL?
The royalty-free 2022 successor to JPEG (.jxl): ~60% smaller photos, lossless mode, HDR, transparency, animation, progressive loading.
Is JPEG XL better than AVIF and WebP?
On quality and features, yes — plus much faster encoding and progressive rendering. AVIF's edge is browser support today; WebP is the universal fallback.
Can JPEG XL shrink my JPGs losslessly?
Yes — ~20% smaller with bit-exact rebuild. No other modern format can do this.
Which browsers support JPEG XL in 2026?
Safari ships it; Chrome lands H2 2026; Firefox progressing. Serve with AVIF/WebP fallbacks until universal.
Should I convert photos to JPEG XL now?
Archives: yes. Websites: prepare with fallbacks. Sharing with people: stay JPG for now.
Does JPEG XL support HDR and transparency?
Both — plus wide gamut, 32-bit depth, and animation. WebP caps at 8-bit SDR.
Batch-convert image formats offline?
Formatif Pro converts entire folders between JPG, PNG, WebP, AVIF, and HEIC — offline, on your computer, with full quality control. No subscription, one-time license.