Fix Guide

How to Enable Gzip / Brotli Compression

Compress text responses (HTML, CSS, JS) so they transfer 60-80% smaller.

Medium High Impact 15 min

Why It Matters

Text-based files compress extremely well. Enabling Brotli or Gzip on the server cuts transfer size by 60-80% with no change to your code — one of the highest-leverage performance wins available.

How to Fix

Turn it on at the server

Enable Brotli (preferred) or Gzip in your web server / CDN for text MIME types.

Verify the header

Check the response includes content-encoding: br (or gzip) for HTML/CSS/JS.

Code Fix

nginx

Before (broken)

# nginx: no compression configured

After (fixed)

# nginx
gzip on;
gzip_types text/css application/javascript application/json image/svg+xml;
brotli on;
brotli_types text/css application/javascript application/json;

Platform-Specific Instructions

WordPress

Most managed hosts enable this by default. If not, a caching plugin or your host's control panel can turn on Gzip/Brotli.

Next.js

Next.js gzip-compresses by default; if you sit behind nginx/Cloudflare, enable Brotli there instead.

Check with our tool

HTTP Header Checker

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How to Enable Gzip / Brotli Compression — Fix Guide | SlapMyWeb