JXL to AVIF Converter
Convert JPEG XL files (released 2021 (JPEG), Lossless + Lossy) to AVIF (Lossless + Lossy (AV1-based), typically 30–50% smaller than WebP at the same quality). Runs in your browser — no upload, no signup.
Based on 12,431+ conversions delivered
Every JXL to AVIF conversion here runs inside your browser — your files are read, converted, and handed back without ever being uploaded to a server. That matters when the images are personal photos, client work, or anything you'd rather not hand to a cloud service. JPEG XL is Lossless + Lossy and suits Archival, lossless re-encoding of JPEG, future-proof storage; AVIF is Lossless + Lossy (AV1-based) and fits Bandwidth-critical pages with modern audiences better. In our sample set, JXL files came out about 50% smaller as AVIF. Drop one file or a whole batch — the conversion is identical either way and nothing leaves your device. Below you'll find how the two formats compare and the details worth checking before you convert at scale.
Looking to programmatically convert JXL to AVIF?
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
JXL vs AVIF — side-by-side
The numbers and capabilities at a glance, so you know what you're trading.
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
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
Real JXL → AVIF 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 | JXL size | AVIF size | Change |
|---|---|---|---|
| Photo | 32.0 KB | 18.2 KB | -43% smaller |
| Screenshot / UI | 4.2 KB | 1.3 KB | -69% smaller |
| Logo / transparency | 7.5 KB | 2.6 KB | -66% smaller |
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 JXL → AVIF
What changes — and what your conversion will cost — based on how JPEG XL and AVIF differ.
Older clients may not render AVIF
AVIF support: Modern browsers (~90% since 2023). 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 AVIF before swapping at scale, or ship a JPEG XL fallback for the long tail.
Higher bit depth gets clipped
JPEG XL stores image data at a higher bit depth per channel than AVIF encodes by default. Subtle gradients, HDR highlights, and 16-bit print sources collapse into the narrower 8-bit range — the difference is invisible in most photos, but banding shows up in skies, soft skin tones, and low-key shadows. If you need the precision (retouching, print, raw archive), keep the JPEG XL source and convert a copy.
Chroma subsampling kicks in
JPEG XL stores full-resolution colour channels. AVIF's default lossy mode subsamples chroma (typically 4:2:0) — half the colour information thrown away to save bytes. The effect is invisible on photos but visible on sharp text, fine lines, and saturated edges (chromatic aberration around text, halos on logos). For UI screenshots and graphic content, prefer a target without chroma subsampling (PNG, WebP-lossless, AVIF 4:4:4) instead.
Best practices for JXL → AVIF
Concrete settings to pick before you convert JPEG XL to AVIF.
- Always preview the AVIF 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 AVIF 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 AVIF.
- When converting to AVIF (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 AVIF delivery, encode in sRGB — wider colour spaces (Display P3, ProPhoto) render unpredictably across browsers and email clients.
When NOT to convert JXL → AVIF
Honest cases where this conversion is the wrong call — pick a different format or keep your JPEG XL source.
Skip if your audience uses legacy browsers
AVIF 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 JPEG XL (or a universal format like JPEG/PNG) — or ship AVIF alongside a fallback via the HTML <picture> element.
Skip if the file is bound for print
AVIF 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 JPEG XL to AVIF 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 JXL → AVIF right matters more than you think.
Frequently asked
The basics everyone asks before dropping a file.
Convert JXL to other formats