AVIF to JXL Converter
Convert AVIF files (released 2019 (AOMedia), Lossless + Lossy (AV1-based)) 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 AVIF to JXL is one of the most common image jobs on the web, and for good reason. AVIF is Lossless + Lossy (AV1-based) and shines at Bandwidth-critical pages with modern audiences, while JPEG XL is Lossless + Lossy and is built for Archival, lossless re-encoding of JPEG, future-proof storage. In our sample set, JXL files ran about 102% larger than the AVIF source. 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 AVIF and JPEG XL, where JPEG XL is supported, and when a different target would serve you better.
Looking to programmatically convert AVIF 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
AVIF vs JXL — side-by-side
The numbers and capabilities at a glance, so you know what you're trading.
AVIF
- Year released
- 2019 (AOMedia)
- Compression
- Lossless + Lossy (AV1-based)
- Transparency
- Yes
- Animation
- Yes
- Browser support
- Modern browsers (~90% since 2023)
- Best for
- Bandwidth-critical pages with modern audiences
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 AVIF → 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 | AVIF size | JXL size | Change |
|---|---|---|---|
| Photo | 17.4 KB | 26.9 KB | +54% larger |
| Screenshot / UI | 746 B | 4.1 KB | +459% larger |
| Logo / transparency | 2.2 KB | 10.2 KB | +360% 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 AVIF → JXL
What changes — and what your conversion will cost — based on how AVIF 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 AVIF fallback for the long tail.
Best practices for AVIF → JXL
Concrete settings to pick before you convert AVIF 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 AVIF → JXL
Honest cases where this conversion is the wrong call — pick a different format or keep your AVIF 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 AVIF (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 AVIF 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 AVIF → JXL right matters more than you think.
Frequently asked
The basics everyone asks before dropping a file.
Convert AVIF to other formats
Convert other formats to JXL