Compression Dictionary Transport

This is a collection of references and tools related to using dictionary-based compression on the web.

Specs

The main overview document and reference is the IETF Compression Dictionary Transport draft. There is also a set of examples showing the impact of using dictionary-based compression.

Tools

• Dictionary Generator - Generate a dictionary from a list of URLs and, optionally, test the effectiveness of dictionary compression on those pages.
• Delta Compression Tester - Test the effectiveness of compressing a new version of a resource using a previous version as a dictionary.

Documentation

• IETF Internet Draft
• CDN support - Configuration details for various CDNs to allow compression dictionary encoding.
• CLI commands - Command-line for creating "dcb" and "dcz" files.
• performance.now() 2023 conference presentation - video - slides (Dark version here.)

Browser Status

Compression Dictionary Transport is available in Chrome 130 and later (or through about:flags in chrome 119+).