Convert PNG to JPEG XL
PNG is great at being pixel-perfect and painful when it comes to file size. A single large screenshot, diagram or interface asset can weigh far more than it needs to. JPEG XL solves exactly that: its true-lossless mode compresses PNG content with no quality loss at all, and for most screenshots, icons and graphics the .jxl result is noticeably smaller than the original .png. That's why this converter defaults to lossless — you keep every pixel, and you can reopen it later without degradation. If you'd rather trade a little fidelity for maximum savings on decorative imagery, switch lossless off and tune the quality slider. Browser support keeps improving: Safari has displayed .jxl still images since 2023, Firefox 157 (September 2026) enables it by default, and Chrome is rolling out its decoder. Encoding runs locally via WebAssembly — no uploads, no server, no file-size limits, no watermarks, offline-capable. One honest note: outside browsers (social platforms, older photo apps), .jxl adoption is still ramping up, so keep a JPG or PNG copy for anything you must share elsewhere.
Drop PNG files here or click to browse
Processed locally — files never leave your device
How to use
- Drop your PNG files into the box, or click it to browse.
- Keep Lossless on for pixel-perfect output (default), or turn it off to use the quality slider.
- Encoding runs locally in your browser via WebAssembly.
- Download the converted .jxl images.
Frequently asked questions
PNG is already lossless — why convert it?
Because size is the problem. PNG stores every pixel redundantly, so screenshots, icons and graphics bloat quickly. JPEG XL's true-lossless mode preserves every pixel while usually compressing significantly smaller, so you pay nothing for the savings.
What does 'lossless' mean here, exactly?
Lossless mode encodes the PNG with zero quality loss (JPEG XL quality 100). The .jxl opens back to pixel-identical content. The quality slider is only used when you switch Lossless off.
Is transparency kept?
Yes. JPEG XL supports alpha, and lossless mode preserves it exactly. Transparent PNG icons and logos convert correctly.
When should I turn off lossless and lower quality?
When the file is decorative, such as large photos embedded in an interface or marketing assets where absolute fidelity doesn't matter. For screenshots, UI assets, charts or anything archival, keep lossless on.
Can anything open .jxl files?
Safari has displayed .jxl still images since 2023; Firefox 157 (September 2026) enables it by default; Chrome has merged a decoder with default-on support still pending. Editing and OS support is growing but still uneven — for sharing with services that don't accept .jxl, keep a PNG or JPG copy.
Are my PNG files uploaded?
No. The libjxl encoder runs as WebAssembly inside your browser. Your files stay on your device and conversion works offline after the codec loads once.
How does PNG→JXL compare to JPG→JXL?
JPG sources contain existing lossy compression, so converting them re-compresses that loss. PNG sources have clean, lossless data — converting preserves it pixel-for-pixel, which is why lossless mode shines here.
Related tools
Decode .jxl back to PNG with JXL to PNG or to JPG with JXL to JPG. Starting from JPG instead? Use JPG to JXL, or WebP to JXL for WebP sources.