PNG to JXL Converter
Convert PNG files (released 1996, Lossless) to JPEG XL (Lossless + Lossy, typically ~25% smaller than WebP, with lossless JPEG transcoding). Runs in your browser — no upload, no signup.
Based on 12,431+ conversions delivered
Converting PNG to JXL is one of the most common image jobs on the web, and for good reason. PNG is Lossless and shines at Screenshots, icons, logos, any image with transparency, while JPEG XL is Lossless + Lossy and is built for Archival, lossless re-encoding of JPEG, future-proof storage. In our sample set, PNG files came out about 76% smaller as JXL. Because everything runs in your browser, your files never leave your device — no upload queue, no signup, no size cap on the fast path. Drop a batch, check the preview, download. The sections below break down exactly what changes between PNG and JPEG XL, where JPEG XL is supported, and when a different target would serve you better.
Looking to programmatically convert PNG to JXL?
Same engine, available as a JSON API. Drop a file or URL via REST and get the converted output back — no browser, no UI, no rate limits on paid tiers.
Sub-second response on common pairs
Webhook delivery for batch jobs
100+ format pairs supported
PNG vs JXL — side-by-side
The numbers and capabilities at a glance, so you know what you're trading.
PNG
- Year released
- 1996
- Compression
- Lossless
- Transparency
- Yes (full alpha)
- Animation
- No (use APNG / GIF / WebP)
- Browser support
- Universal (every browser since the 90s)
- Best for
- Screenshots, icons, logos, any image with transparency
JPEG XL
- Year released
- 2021 (JPEG)
- Compression
- Lossless + Lossy
- Transparency
- Yes
- Animation
- Yes
- Browser support
- Limited — Safari 17+; behind a flag in Chrome/Firefox
- Best for
- Archival, lossless re-encoding of JPEG, future-proof storage
Real PNG → JXL file sizes
We ran a fixed set of sample images through this exact converter so you can see the typical size impact before converting your own files.
| Sample image | PNG size | JXL size | Change |
|---|---|---|---|
| Photo | 174.4 KB | 32.0 KB | -82% smaller |
| Screenshot / UI | 488 B | 4.1 KB | +770% larger |
| Logo / transparency | 6.8 KB | 7.5 KB | +10% larger |
Measured on a 256×256 sample set with this converter on 2026-05-28. Real-world files vary with resolution, colour and content.
Heads up before converting PNG → JXL
What changes — and what your conversion will cost — based on how PNG and JPEG XL differ.
Older clients may not render JPEG XL
JPEG XL support: Limited — Safari 17+; behind a flag in Chrome/Firefox. Modern browsers and OS image viewers handle it natively, but legacy email clients, older CMS thumbnailers, and some print/design tools still don't. Confirm the downstream consumers in your pipeline accept JPEG XL before swapping at scale, or ship a PNG fallback for the long tail.
Best practices for PNG → JXL
Concrete settings to pick before you convert PNG to JPEG XL.
- Always preview the JPEG XL output before bulk-downloading — colour shifts, transparency surprises, and quality artifacts show up in the preview before they ship.
- Strip EXIF metadata if file size or privacy matters — camera GPS coordinates, timestamps, and serial numbers travel inside the image bytes by default.
- For photographic content, target a JPEG XL quality between 80 and 85 — that's the sweet spot where most encoders stop showing visible artifacts and the file size curve flattens.
- Verify the alpha channel rendered as expected — premultiplied vs straight alpha and edge halos around antialiased pixels are the most common surprises when going to JPEG XL.
- When converting to JPEG XL (animated), confirm the frame timing matches your source — some encoders default to a fixed 100ms delay per frame instead of preserving the original timing.
- For web JPEG XL delivery, encode in sRGB — wider colour spaces (Display P3, ProPhoto) render unpredictably across browsers and email clients.
When NOT to convert PNG → JXL
Honest cases where this conversion is the wrong call — pick a different format or keep your PNG source.
Skip if your audience uses legacy browsers
JPEG XL doesn't render on every old browser, email client, or built-in OS viewer. If your traffic includes IE11, legacy Outlook, or older Android WebViews, stay on PNG (or a universal format like JPEG/PNG) — or ship JPEG XL alongside a fallback via the HTML <picture> element.
Skip if the file is bound for print
JPEG XL is a delivery-grade web format. Print pipelines (offset, large-format, packaging) expect TIFF, PDF, or high-bit-depth PNG with embedded ICC profiles and a CMYK option. Converting PNG to JPEG XL for a print job will likely fail prepress checks — keep the original or convert to a print-friendly format instead.
The importance of a good image conversion
Why getting PNG → JXL right matters more than you think.
Frequently asked
The basics everyone asks before dropping a file.
Convert PNG to other formats
Convert other formats to JXL