Convert JPEG to AVIF
Get the smallest possible files with AVIF. Up to 50% smaller than JPEG at the same quality.
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JPEG, PNG, WebP, AVIF up to 50MB each
JPEG vs AVIF: The Size Difference
Compression
AVIF achieves 40-50% smaller files than JPEG at equivalent quality.
Quality
AVIF handles fine details and gradients better than JPEG with fewer artifacts.
Modern Format
AVIF is the most efficient image format, backed by the Alliance for Open Media.
Encoding Time
AVIF encoding takes a few seconds longer but the file size savings are worth it.
JPEG vs. AVIF: Three Decades of Compression Science Separate These Formats
AVIF, standardized in 2019 by the Alliance for Open Media, represents the most significant leap in image compression since JPEG's introduction in 1992. Built on the AV1 video codec, AVIF uses intra-frame prediction, transform coding, and advanced entropy coding to achieve 50% smaller files than JPEG at comparable visual quality. For a news website serving 200,000 daily page views with an average of 8 images each, switching from JPEG to AVIF can reduce monthly bandwidth by several terabytes.
The JPEG standard was designed around 8-bit color depth and the YCbCr 4:2:0 chroma subsampling model. AVIF supports 10-bit and 12-bit HDR content, wide color gamuts including BT.2020, and both 4:4:4 and 4:2:0 subsampling. Photographers working with HDR displays and modern color-managed workflows gain tangible benefits — shadow detail and color gradients that JPEG clips or bands are preserved faithfully in AVIF's wider dynamic range.
Encoding speed is the primary trade-off when moving from JPEG to AVIF. A 4000x3000 pixel photograph encodes to JPEG in 50-100 milliseconds on modern hardware, while AVIF encoding for the same image can take 2-8 seconds depending on speed/quality settings. Krunkit's WASM-based AVIF encoder (libavif) uses speed preset 6 by default, balancing encoding time and compression efficiency for browser-based processing without server dependencies.
The JPEG file extension inconsistency — .jpg versus .jpeg — has caused decades of compatibility issues in automated pipelines. AVIF sidesteps this entirely with a single canonical .avif extension governed by a modern ISOBMFF container specification. This clean standard, combined with MIME type image/avif registered with IANA, ensures consistent behavior across CDNs, build tools, and content management systems.
Pro Tips
Use AVIF quality 40-50 to match JPEG quality 80
AVIF's quality scale is dramatically different from JPEG's. What looks acceptable at JPEG 80 can be achieved at AVIF 40-50, yielding files 50-60% smaller. Always compare visually rather than matching numbers directly.
Verify browser support before replacing JPEG entirely
AVIF is supported in Chrome 85+, Firefox 93+, and Safari 16.4+, covering roughly 92% of global users as of early 2026. For the remaining 8%, serve JPEG as a fallback using the <picture> element or Accept header negotiation on your CDN.
Prioritize hero images and above-the-fold content for AVIF conversion
Since AVIF decoding is slightly slower than JPEG (around 1.3x on average), convert your largest, most impactful images first. A 500 KB hero image dropping to 200 KB in AVIF delivers a noticeable speed improvement that outweighs the minor decode overhead.
Frequently Asked Questions
Is JPEG the same as JPG?
Yes, identical formats. JPG is simply a shorter extension.
Why is AVIF so much smaller than JPEG?
AVIF uses advanced compression from the AV1 codec, which is significantly more efficient than JPEG's 30-year-old DCT algorithm.
Can all browsers show AVIF?
Chrome, Firefox, and Safari 16+ support AVIF. Older browsers may need a JPEG fallback.
Is there a file size limit?
No hard limit. Processing happens in your browser, so large files just take a bit longer.