Joint Photographic Experts Group (.jpg / .jpeg) is a image format. The classic photo format: widely supported, good quality-to-size for photographs. It uses lossy compression.

What is JPEG used for?

JPEG is commonly used for: photographs, blog images, backgrounds.

How do I optimize JPEG files?

Run "npx optimo photo.jpg" in your terminal. Optimo applies format-specific compression to reduce JPEG file size while preserving quality.

What is JPEG?

Joint Photographic Experts Group (.jpg / .jpeg). The classic photo format: widely supported, good quality-to-size for photographs.

Last updated: 2026-03-18

JPEG (Joint Photographic Experts Group, .jpg / .jpeg) is a image format that uses lossy compression. The classic photo format: widely supported, good quality-to-size for photographs. Common uses include photographs, blog images, backgrounds.

Quick facts

Extension

.jpg / .jpeg

Type

Image format

Compression

lossy

Transparency

Animation

MIME type

image/jpeg

Common uses

photographs
blog images
backgrounds

Delivery notes

A safe default for photo delivery.
Consider WebP/AVIF for smaller files at similar quality.

What to do with optimo

Optimize JPEG Compress JPEG Resize JPEG Convert between formats

npx optimo photo.jpg

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 Convert WebP to JPEG Convert AVIF to JPEG

More image formats

PNG WebP AVIF HEIC JPEG XL GIF SVG

Frequently asked questions

What is JPEG?: Joint Photographic Experts Group (.jpg / .jpeg) is a image format. The classic photo format: widely supported, good quality-to-size for photographs. It uses lossy compression.
What is JPEG used for?: JPEG is commonly used for: photographs, blog images, backgrounds.
How do I optimize JPEG files?: Run "npx optimo photo.jpg" in your terminal. Optimo applies format-specific compression to reduce JPEG file size while preserving quality.