Convert PNG to JXL
You convert PNG to JXL by dropping the PNG into the converter on this page and clicking Convert to JXL. The JPEG XL encoder runs as WebAssembly directly in your browser, so the JXL is built on your device and the PNG is never sent across the network.
Runs in your browser. Your file never leaves your device.Drop your PNG hereChoose a PNG to convert
It becomes a JXL right in your browser, up to 100 MB
Your file never leaves your device
Works in airplane mode. See the proof
Limits, published exactly
| Where it runs | In your browser. The file never leaves your device. |
|---|---|
| Free conversions | Unlimited. No account, no ads, no queue, no watermark. |
| Max file size, free | 100 MB |
Why convert PNG to JXL?
People reach for this to shrink an archive without giving up much, betting on the format of the future. A folder of lossless PNGs can be enormous, and JXL (JPEG XL) was designed to store images far more efficiently while keeping modern features like transparency. The honest reality is reach: almost no browser opens a .jxl today, so this is for storage and backups you control, not for publishing or sharing with someone who just wants to double-click and view it. Convert to JXL when disk space and a forward-looking master matter more than instant compatibility.
What is PNG?
PNG (Portable Network Graphics) is a lossless image format from 1996. It compresses with DEFLATE, keeps every pixel exactly as authored, and supports a full 8-bit alpha channel for transparency. That makes it the default choice for screenshots, UI mockups, logos and anything with sharp edges or text. The tradeoff is size: photographs stored as PNG are often several times larger than a visually identical lossy file.
What is JXL?
JXL (JPEG XL) is the JPEG committee's own successor format, finalized in 2022: a royalty-free codec that beats classic JPEG on compression, supports lossless mode, transparency, HDR and even lossless recompression of existing JPEG files. Adoption has been turbulent: Safari ships it, Chrome removed its experiment, and most desktop software cannot open a .jxl yet, which is precisely when a converter becomes necessary.
Quality and what to expect
This converter encodes at the JXL encoder's default setting. PNG is lossless, so the meaningful question is whether the JXL step is also lossless, and at the default that is not something this page guarantees, so treat the JXL as a compact archival copy rather than a certified bit-exact twin of the PNG. Keep the PNG master if exactness matters. On the upside, JXL supports an alpha channel, so transparency from the PNG can be represented in the output. Metadata such as embedded color or EXIF information is not copied over.
PNG to JXL FAQ
Why convert PNG to JXL at all?
Mostly for storage. PNG is lossless and often large, while JXL is built to store images much more compactly. If you are archiving a big collection and want a future-facing format, JXL is a sensible target, as long as you accept that almost nothing opens it yet.
Does the JXL keep my PNG transparency?
JXL supports a full alpha channel, so transparency from the PNG can be carried into the output rather than flattened. That is one advantage it has over converting a transparent PNG to a format like JPG.
Can people open a JXL I send them?
Probably not today. Browser and app support for JXL is near zero, so a recipient likely cannot view it without specialized software. Use this for your own archives and backups, and convert to PNG or JPG when you need to share.
Is the PNG uploaded to make the JXL?
No. The JXL encoder is WebAssembly running in a worker on your own machine, inside the browser tab. Your PNG never touches a server, and you can verify that by watching the network requests while it converts.