Convert JPEG images to AVIF for the smallest possible file sizes with superior quality. AVIF can be up to 50% smaller than JPEG. LessMB converts locally in your browser.
ファイルをここにドロップ、または
JPG · PNG · WebP · GIF · AVIF · SVG
AVIF uses AV1-based compression that significantly outperforms JPEG, producing smaller files at equal or better visual quality.
AVIF is supported in Chrome, Firefox, Safari and Edge. It is the most efficient widely-supported image format available.
Your JPEG is decoded and re-encoded as AVIF entirely in your browser. No server upload is needed.
Use AVIF when file size is the top priority and target browsers support the format.
Maximum compressionConvert large hero and banner images to AVIF for dramatic page speed improvements.
Hero imagesServe AVIF with JPEG fallback for the best performance across all browsers.
Progressive enhancementこのツール、対応ワークフロー、ローカル処理についてのよくある質問です。
AVIF typically produces 10-20% smaller files than WebP at equivalent quality, but WebP has slightly broader legacy support.
Yes. LessMB converts JPG to AVIF for free in your browser without requiring an account.
No. Conversion runs locally in your browser session.