How to convert PNG to JPEG XL
imglogotool.com converts PNG to JPEG XL (JXL) using the libjxl WebAssembly codec. JPEG XL is the smallest lossless image format available today — smaller than PNG, WebP lossless, and AVIF lossless. All processing runs locally in your browser.
Open the Image Converter and drop your PNG files.
Select JXL format. For lossless quality, set quality to 100%. For lossy with smaller files, use 75-85%.
Save your JPEG XL files.
PNG vs JPEG XL — detailed comparison
| PNG | JPEG XL | |
|---|---|---|
| Lossless compression | Yes | Yes — 35% smaller than PNG |
| Lossy compression | No | Yes |
| Transparency | Yes (8-bit) | Yes (up to 32-bit float) |
| HDR support | No | Yes (PQ, HLG) |
| Animation | No | Yes |
| Progressive decode | No | Yes — loads preview instantly |
| Lossless JPG recompress | No | Yes — 20% smaller, bit-for-bit reversible |
| Browser support | 100% | Safari 17+, Chrome 145+ (flag) |
| Encoding speed | Fast | Fast (faster than AVIF) |
Lossless format comparison
If you need lossless quality (zero data loss), here's how the formats compare:
| Format | Lossless file size (relative) | Browser support |
|---|---|---|
| BMP | 100% (uncompressed) | 100% |
| PNG | ~30% of BMP | 100% |
| AVIF lossless | ~24% of BMP | 93% |
| WebP lossless | ~22% of BMP | 97% |
| JPEG XL lossless | ~20% of BMP (smallest) | Safari 17+, Chrome 145+ |
Why JPEG XL?
Best lossless compression: JPEG XL lossless produces files ~35% smaller than PNG. For a 1 MB PNG, the JXL lossless version is typically 650 KB.
Progressive decoding: Unlike PNG (which loads top-to-bottom), JPEG XL shows a low-resolution preview instantly, then progressively sharpens. Better perceived performance.
Future-proof: Chrome 145+ added JPEG XL support (behind flag). Safari 17+ already supports it natively. Firefox is considering it. JPEG XL is designed to eventually replace both JPEG and PNG.
Fast encoding: Unlike AVIF (which uses the slow AV1 codec), JPEG XL encodes quickly — comparable to WebP. On imglogotool.com, a 1024×1024 PNG converts to JXL in 1-3 seconds.
Browser support status (2026)
| Browser | JPEG XL support |
|---|---|
| Safari 17+ | Native support since 2023 |
| Chrome 145+ | Behind enable-jxl flag (Feb 2026) |
| Edge | Same as Chrome (Chromium) |
| Firefox | Not yet — under consideration |
For production websites, use `<picture>` element with JXL source and PNG/WebP fallback.
Related conversions
PNG to WebP — broader browser support (97%), fast encoding.
PNG to AVIF — maximum lossy compression, 93% browser support.
JPG to WebP — convert photos to smaller WebP format.
Need to compress PNG without converting? Try the PNG Compressor.
Frequently asked questions
Is JPEG XL lossless smaller than PNG?
Yes. JPEG XL lossless produces files approximately 35% smaller than PNG. It is currently the smallest lossless image format available.
Does JPEG XL support transparency?
Yes. JPEG XL supports full alpha channel transparency with up to 32-bit float precision — far beyond PNG's 8-bit limit.
Is JPEG XL supported in Chrome?
Yes, Chrome 145+ (February 2026) added JPEG XL support behind the enable-jxl flag. Safari 17+ has had native support since 2023. Full default support is expected soon.
Is JPEG XL faster than AVIF to encode?
Yes, significantly. JPEG XL encoding is comparable to WebP speed. AVIF encoding is 5-10x slower due to the AV1 codec complexity.
Can I convert JPEG XL back to PNG?
Yes. Use the Image Converter to convert JXL to PNG. If the JXL was encoded in lossless mode, the PNG will be identical to the original.
Should I use JPEG XL or WebP?
In 2026, WebP is safer (97% browser support). JPEG XL is technically superior but has limited browser support. Use both via <picture> element for progressive enhancement.
Are my files uploaded?
No. All JPEG XL encoding runs locally in your browser using WebAssembly (libjxl). Your images never leave your device.
What is lossless JPEG recompression?
JPEG XL can take an existing JPG file and recompress it 20% smaller with zero quality loss — and convert back to the exact same JPG. No other format can do this. Note: this feature requires native libjxl, not available in browser WASM yet.