How do I compress AVIF files?

Run "npx optimo image.avif" to compress AVIF with lossless optimization. For stronger compression, add --lossy. For size reduction through resizing, add --resize followed by a percentage, dimensions, or target file size.

What is the best way to reduce AVIF file size?

The two biggest levers are resizing (reducing dimensions to match display size) and lossy compression. Resizing usually has a larger impact than codec-level compression. Sometimes converting to a more efficient format is the best approach.

Compress AVIF files

Compress AVIF when you need aggressive file-size reductions. It can beat WebP on photos at similar perceived quality.

Last updated: 2026-03-18

To compress AVIF files, run npx optimo image.avif. Optimo applies ImageMagick-powered compression by default. For stronger reduction, use --lossy or --resize to shrink dimensions — often the single biggest lever for file size.

Start with optimo

First, run optimo on your image file:

npx optimo image.avif

This is safe: optimo keeps the original if the output isn't smaller.

Two big levers

1) Lossy mode

npx optimo image.avif --lossy

2) Resize (dimensions)

npx optimo image.avif --resize w1280

Practical tips

AVIF can be slower to encode; it’s a good fit for build-time steps.
If compatibility is a concern, keep a WebP/JPEG fallback in your delivery layer.
Resizing down is still the biggest lever; compression is second.

Optimize AVIF Resize AVIF AVIF format guide

Consider converting

Sometimes the best compression is picking a better delivery format.

AVIF → PNG AVIF → JPEG AVIF → WebP AVIF → HEIC AVIF → JPEG XL AVIF → GIF

Popular conversions

Convert PNG to AVIF Convert JPEG to AVIF Convert WebP to AVIF Convert AVIF to PNG Convert AVIF to JPEG Convert AVIF to WebP Convert AVIF to HEIC Convert AVIF to JPEG XL

Frequently asked questions

How do I compress AVIF files?: Run "npx optimo image.avif" to compress AVIF with lossless optimization. For stronger compression, add --lossy. For size reduction through resizing, add --resize followed by a percentage, dimensions, or target file size.
What is the best way to reduce AVIF file size?: The two biggest levers are resizing (reducing dimensions to match display size) and lossy compression. Resizing usually has a larger impact than codec-level compression. Sometimes converting to a more efficient format is the best approach.