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HTTP Gzip / Brotli Size Estimator

Estimate compressed transfer size for HTML or JSON text using Shannon entropy heuristics. Compare raw vs gzip and brotli ratios without deploying a server.

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Use cases

Estimate whether a 3 MB JSON API shrinks enough with compression
Compare redundancy before enabling CDN compression

How to use

Paste long text or JSON
Review estimated gzip and brotli sizes and ratios

Example input and output

Raw

{"a":1, "a":1}

Gzip

High redundancy → smaller compressed ratio

FAQ

Does it run real gzip?

It uses local entropy heuristics (~±10%) instead of full compression to stay lightweight in the browser.

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