iformat

Free Online JPG to AVIF Converter

Re-encode a JPG as AVIF for the smallest file the modern web will take.

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JPG files · up to 50 MB each · 100 MB with a free account

JPG to AVIF: next-generation web compression

AVIF's AV1 codec outperforms JPG's DCT algorithm by 40-50% in compression efficiency at equivalent SSIM quality scores. The conversion decodes the JPG's DCT-compressed data and re-encodes with AV1's prediction-based compression, which uses larger and more flexible transform blocks, directional intra prediction, and advanced entropy coding (arithmetic vs JPG's Huffman). Since both are lossy, quality can only be preserved or further reduced, never improved beyond what the JPG source captured.

Convert JPG to AVIF when optimizing web performance, the same visual quality at 40-50% less bandwidth directly improves Core Web Vitals and page load speed. AVIF is supported in Chrome, Firefox, and Safari 16+. Serve the original JPG as fallback for older browsers.

JPG vs AVIF: Side-by-side

Technical comparison of the two formats, useful for deciding which to use, or for confirming what changes during conversion.

Property JPG AVIF
Full name JPEG (Joint Photographic Experts Group) AV1 Image File Format
Year introduced 1992 2019
Developer / standard body JPEG Committee Alliance for Open Media
MIME type image/jpeg image/avif
File extension .jpg / .jpeg .avif
Compression Lossy (DCT-based) Lossy or lossless (AV1)
Color / data depth 24-bit truecolor 8/10/12-bit
Max dimensions / size 65,535 × 65,535 px 65,536 × 65,536 px
Transparency No Yes
Animation No Yes
Standard / specification ISO/IEC 10918 AOMedia AV1
Best for Photos, web images, email attachments Next-gen web images, 50% smaller than JPG, 20% smaller than WebP

Frequently asked questions

Can I convert JPG to AVIF without losing quality?
AVIF is a next-generation AV1-based image format. Converting to a lossless target such as PNG, TIFF or BMP preserves every pixel exactly. Converting to a lossy one such as JPG or WebP re-encodes the image, and iFormat uses a high default quality so the difference is invisible at normal viewing size. For the sharpest result, always convert from the highest-quality source you have.

What is JPG?
JPG is a lossy raster format, typically used for photos and web images where small size matters. Converting it to AVIF produces a file that opens on systems without JPG support.

JPG vs AVIF - which format should I use?
JPG is a lossy raster format best for photos and web images where small size matters. AVIF is a next-generation AV1-based image format best for very small, high-quality web images. Choose AVIF when the site or application you are submitting to asks for it, or when you need the smallest files at a given quality, with transparency.

How do I open JPG files?
On Windows: Photos, or any browser. On a Mac: Preview, or any browser. Universally supported, if a JPG will not open, the file is probably corrupt or misnamed.

JPG vs AVIF - which format should I use?
JPG is a lossy raster format best for photos and web images where small size matters. AVIF is a next-generation AV1-based image format best for very small, high-quality web images. Use AVIF when a website, form, or app requires it, or when you need the smallest files at a given quality, with transparency.

How much smaller will my JPG become as AVIF?
Typically 50–70% smaller at equivalent visual quality. A 1 MB JPG photo becomes 200–400 KB as AVIF. The savings come from AV1's more sophisticated compression, which handles gradients, textures, and fine details better than JPG's 30-year-old algorithm.

Do all browsers support AVIF?
Chrome (since v85), Firefox (since v93), and Safari (since v16.4) all support AVIF. That covers 90%+ of web traffic. For the remaining browsers, serve JPG as a fallback using the HTML <picture> element.

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