Performance · Website glossary

Compression

Quick answer · What is Compression?

The reduction of data size using an encoding that a recipient can decode.

IN PRACTICE

Compression: an example

A server compresses a text response before transmission, and the browser decodes it for use.

KEEP IN MIND

Compressing an already compressed image may produce little benefit; measure actual transfer size.

Put the idea to work

Frequently asked questions

What is a practical example of Compression?

A server compresses a text response before transmission, and the browser decodes it for use.

Will compressing an already compressed image always help?

Compressing an already compressed image may produce little benefit; measure actual transfer size.

Which concepts should I read alongside Compression?

Data transfer: The amount of data moved across a connection during a stated period or operation.
Minification: The removal of unnecessary characters or other safe simplifications from source assets to reduce their size.