How do I compress WebP files?

Run "npx optimo image.webp" to compress WebP 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 WebP 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 WebP files

Compress WebP for fast delivery. It’s a strong default for mixed content (photos + graphics) and often smaller than JPEG/PNG.

Last updated: 2026-03-18

To compress WebP files, run npx optimo image.webp. 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.webp

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

Two big levers

1) Lossy mode

npx optimo image.webp --lossy

2) Resize (dimensions)

npx optimo image.webp --resize w1280

Practical tips

If you need maximum compression on photos, compare with AVIF.
WebP supports transparency and animation — useful for replacing PNG/GIF.
Use `--resize` first when source dimensions are too large.

Optimize WebP Resize WebP WebP format guide

Consider converting

Sometimes the best compression is picking a better delivery format.

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

Popular conversions

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

Frequently asked questions

How do I compress WebP files?: Run "npx optimo image.webp" to compress WebP 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 WebP 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.