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JPG to AVIF Converter: Convert JPEG to AVIF Online

Convert JPEG images to AVIF for 30-50% smaller files at the same visual quality. Runs in your browser with no upload required.

100% client-side. Your data never leaves your browser.

Drop JPEG file here

or click to browse · paste from clipboard (Ctrl/⌘+V)

PNG, JPG, WebP, AVIF, GIF, BMP, SVG, HEIC, ICO · up to 20 files

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Convert JPG to AVIF

JPEG has been the standard photograph format since 1992, but AVIF outperforms it by 30-50% in file size at equivalent visual quality. Where JPEG uses 8x8 block-based DCT compression (which causes visible blocking artifacts at low quality), AVIF uses the AV1 codec’s more sophisticated approach with variable block sizes and better handling of smooth gradients.

This tool converts JPEG to AVIF entirely in your browser. No files leave your machine.

JPEG vs AVIF compression

JPEG compression works by dividing the image into fixed 8x8 pixel blocks and applying the discrete cosine transform to each block independently. This causes the characteristic “blockiness” at low quality settings. AVIF uses superblocks up to 128x128 pixels with recursive subdivision, allowing it to adapt to image content at multiple scales.

The practical result: AVIF at quality 60 often looks better than JPEG at quality 85, while being 40% smaller. This is particularly noticeable in areas with smooth color gradients (skies, skin tones) where JPEG artifacts are most visible.

How to use

  1. Drop or paste a JPEG file into the converter above
  2. Adjust the quality slider (80 is a good default for web use)
  3. Compare the before/after preview and file sizes
  4. Download the AVIF result

Web delivery strategy

The recommended approach for serving images on the web is to provide AVIF as the primary format with JPEG as fallback:

<picture>
  <source srcset="photo.avif" type="image/avif">
  <img src="photo.jpg" alt="Description">
</picture>

This ensures modern browsers get the smaller AVIF file while older browsers fall back to JPEG. The bandwidth savings compound quickly on image-heavy pages.