How do I optimize JPEG files?

Run "npx optimo photo.jpg" in your terminal. Optimo applies format-specific ImageMagick-powered compression that reduces JPEG file size while preserving quality. The original file is kept if the optimized output is not smaller.

Is JPEG optimization lossless?

By default, optimo uses lossless optimization for JPEG. For additional compression, add the --lossy flag to allow minor quality trade-offs for significantly smaller files.

What tools does optimo use for JPEG?

Optimo uses ImageMagick, MozJPEG, and SVGO (depending on format) under the hood with format-specific settings tuned for JPEG files.

Optimize JPEG for the web

The classic photo format: widely supported, good quality-to-size for photographs.

Last updated: 2026-03-18

To optimize JPEG images, run npx optimo photo.jpg. Optimo applies format-specific ImageMagick-powered compression that typically reduces JPEG file size by 15–40% without visible quality loss. The original file is kept if the output is not smaller.

Command

Start here. Run optimo on a image file:

npx optimo photo.jpg

Tip: add --dry-run to preview changes.

When to use JPEG

photographs
blog images
backgrounds

Trade-offs

No transparency
Quality degrades with repeated edits

Related formats

PNG

Lossless image format with sharp edges and great support for transparency.

WebP

Modern image format with great compression and broad browser support.

AVIF

High-compression modern image format that can beat WebP on size at similar quality.

HEIC

A common camera output format (especially Apple devices) with efficient compression.

JPEG XL

Next-gen image format designed for high quality and efficient compression.

GIF

Legacy animated image format that is still widely used for simple loops.

SVG

Vector format: crisp at any size and excellent for icons and illustrations.

Related conversions

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

More for JPEG

Compress JPEG Resize JPEG What is JPEG?

Compare formats

If you're picking a delivery format, comparisons can help.

PNG vs JPEG

Frequently asked questions

How do I optimize JPEG files?: Run "npx optimo photo.jpg" in your terminal. Optimo applies format-specific ImageMagick-powered compression that reduces JPEG file size while preserving quality. The original file is kept if the optimized output is not smaller.
Is JPEG optimization lossless?: By default, optimo uses lossless optimization for JPEG. For additional compression, add the --lossy flag to allow minor quality trade-offs for significantly smaller files.
What tools does optimo use for JPEG?: Optimo uses ImageMagick, MozJPEG, and SVGO (depending on format) under the hood with format-specific settings tuned for JPEG files.