Lately when checking website speed, I see many people have optimized everything but the site is still sluggish, especially the Core Web Vitals score is flat. The culprit sometimes lies in something very basic: data compression. Between the familiar Gzip and the emerging Brotli, the straightforward answer is that Brotli is often "better". It compresses HTML, CSS, JS files up to 15-25% smaller than Gzip, helping your page load noticeably faster. This is an advantage that cannot be ignored when discussing Brotli vs Gzip website data compression.
Brotli vs Gzip: Put on the scale, who is better?
Brotli is a modern compression algorithm developed by Google, providing a compression rate 15-25% better than Gzip for text files, helping websites load faster and save significantly more bandwidth.
Many website administrators often wonder if Brotli is better than Gzip. To answer, we need to look at the nature of technology. Gzip uses the DEFLATE algorithm created in the 90s, which has been the gold standard for many years. However, Brotli (launched in 2015) uses a pre-defined static dictionary containing tens of thousands of common keywords on the web (like "html", "script", "style").
Thanks to the lossless compression mechanism combined with the 2nd-level context model, Brotli is extremely well optimized for web source codes. Both aim to optimize page load speed, but the way they work creates a big difference in actual performance.
Compare performance through talking numbers
Actual tests updated until 2026 show that Brotli reduces HTML, CSS, JavaScript file sizes up to 25% smaller than Gzip, especially effective with static resources.
When comparing Brotli and Gzip performance, compression ratio is the factor of most concern. At Pham Hai company, I have tested on many real projects. The results show that JavaScript files are often reduced by 15-20%, and CSS files can be reduced by up to 30% compared to when using Gzip. This delivers outstanding website performance.
Reducing file size not only helps the website load quickly but also saves server bandwidth extremely effectively. Of course, before compressing via the server, you should also proactively lighten the original file. You can refer to minify css html js wordpress to thoroughly optimize right from the source code.
Compression and decompression speed: The battle between "athletes" and "marathon runners"
Gzip has extremely fast compression speed suitable for dynamic resources, while high level Brotli takes more compression time but has super fast decompression speed on the browser side.
Brotli provides compression levels from 1 to 11. At level 11 (the highest), Brotli compresses extremely small but "consumes" quite a lot of CPU and time of the web server. It's like an "athlete" who needs time to strain the file. In contrast, Gzip compresses faster and more gently, acting like a durable "marathon runner".
However, Brotli's selling point is decompression speed. When the data arrives in the user's browser, Google's algorithm unpacks the file almost immediately. This difference shapes how we configure the server to make the most sense.
Level of "coverage": Which browsers support Brotli?
As of early 2026, data from CanIUse shows that more than 97% of modern web browsers (Chrome, Safari, Firefox, Edge) have full browser support for the Brotli compression algorithm.
In the past, many people were afraid to use Brotli because they were afraid of display errors. But now, when the browser sends a request to the server, it will attach the Accept-Encoding header: br, gzip, deflate. If the server has Brotli, it will automatically prioritize returning data with the Content-Encoding: br header.
For older browsers that do not support it, the server will automatically revert to using Gzip. Therefore, you can be completely assured about compatibility issues when implementing Brotli vs Gzip to compress website data.
So in the end, which "item" should you choose for your website?
The choice depends on the type of content; Brotli is the #1 choice for static files, while Gzip or low-level Brotli are more suitable for dynamic content.
There is no one-size-fits-all formula. The choice depends on the system architecture and type of web hosting you are using. Below is my real-life experience to help you make the most accurate decision.
With static website and Jamstack: Brotli is "true love"
With a static website, you can pre-compress with Brotli at the highest level (level 11) to achieve the smallest capacity without worrying about consuming server CPU when serving.
If you wonder should you use Brotli or Gzip for static websites, the answer is definitely Brotli. Files such as static HTML, CSS, JS rarely change. You only need to compress them once during the build process (for example using Astro, Next.js, or Hugo).
Pre-compression with Brotli level 11 helps minimize capacity. When a user accesses, the server only needs to pick up the compressed file and throw it out, without consuming another 1% of CPU for on-the-fly compression (direct compression).
With dynamic websites (WordPress, Laravel...): Gzip still has its place, but Brotli is dominating
Dynamic source code like WordPress often uses Brotli at level 4-6 to balance compression speed and capacity, or uses Gzip as a safe backup plan.
When configuring Brotli vs Gzip for WordPress, you must process newly generated HTML content continuously via PHP and Database. If you force the server to run Brotli level 11 for each request, the CPU will immediately overload. The solution here is to set Brotli to an average level (level 4-6) so that the compression speed is equal to Gzip but the returned file size is still smaller.
For the WordPress system to run as smoothly as possible, combining data compression with caching plugins is mandatory. You can see more instructions configuring litespeed cache wordpress or learn how to Optimize OpenLiteSpeed settings for WordPress to maximize performance. In general, combining good compression is the core secret to comprehensively increase WordPress website speed.
How do Brotli and Gzip affect SEO? More than just speed!
Both algorithms help reduce Time To First Byte (TTFB) and improve Core Web Vitals score, thereby directly positively impacting the website's SEO ranking on Google.
Many people ask me how Brotli and Gzip affect SEO. Google loves websites that load quickly. When the file is lighter, the browser renders the content faster, resulting in smooth green LCP (Largest Contentful Paint) and FCP (First Contentful Paint) scores.
Especially with the HTTP/2 and HTTP/3 protocols, Brotli maximizes its power thanks to its ability to split and transmit data streams extremely effectively. Upgrading the compression algorithm is an important part if you want to optimize core web vitals wordpress to score points with search bots and improve user experience.
"Real combat" instructions: Turn on Brotli for 5 minutes
Configuring the server to How to enable Brotli on website is quite simple if you understand the environment you are using such as Nginx, Apache or modern CDN services.
Below are the detailed steps that I often apply to customers at Pham Hai.
Step 1: Check if the website has Brotli or Gzip compression enabled?
Bạn có thể dùng công cụ Developer Tools trên trình duyệt (tab Network) để xem header Content-Encoding trả về là br (Brotli) hay gzip.
To Check Brotli and Gzip compression on your website, open Chrome, press F12, select the Network tab and reload the page. Click on the first HTML or CSS file, look at the Headers column.
Nếu dòng Content-Encoding hiển thị là br, chúc mừng bạn, website đã chạy Brotli. Nếu là gzip, bạn cần tiếp tục các bước cấu hình bên dưới.
Step 2: Instructions for installing Brotli for Nginx
Trên Nginx, bạn cần cài đặt module ngx_brotli và thêm các chỉ thị như brotli on; vào file cấu hình nginx.conf.
Hướng dẫn cài đặt Brotli cho Nginx đòi hỏi một chút kiến thức về command line. Thường thì Nginx mặc định chưa có sẵn module này, bạn cần biên dịch (compile) thêm hoặc cài qua repository.
Sau khi có module, bạn mở file nginx.conf và thêm đoạn mã sau vào block http {}:
brotli on;
brotli_comp_level 6;
brotli_static on;
brotli_types text/plain text/css application/javascript application/json image/svg+xml application/xml+rss;
Note, if your server acts as a proxy, don't forget to review how Nginx configures SSL reverse proxy to ensure compressed data is transmitted over HTTPS as smoothly as possible.
Step 3: Instructions for installing Brotli for Apache
Với Apache, bạn kích hoạt module mod_brotli thông qua EasyApache 4 hoặc command line, sau đó cấu hình bộ lọc BROTLI_COMPRESS.
Nếu bạn dùng cPanel, Hướng dẫn cài đặt Brotli cho Apache cực kỳ nhàn. Bạn chỉ việc vào WHM, tìm đến phần EasyApache 4, chọn Customize và bật module mod_brotli lên.
Nếu thao tác bằng tay trên VPS, bạn dùng lệnh a2enmod brotli. Sau đó, thêm cấu hình sau vào file .htaccess hoặc apache2.conf:
<IfModule mod_brotli.c>
AddOutputFilterByType BROTLI_COMPRESS text/html text/plain text/xml text/css text/javascript application/javascript application/json
</IfModule>
Restart Apache and the system will automatically compress text files according to the latest standards.
Important notes when using Brotli via CDN and hosting platforms
MostCDNs like Cloudflare support enabling Brotli with just one click, helping you take advantage of the compression power without having to deeply intervene in the origin server.
One of the most obvious benefits of Brotli compression is when combined with a CDN. If you are not familiar with this concept, learning What is CDN and why websites need to use CDN is an extremely necessary stepping stone.
Instead of forcing the origin server to bother compressing data, you can push that to the CDN. For example, with the article Cloudflare CDN free installation guide, you will see the Brotli enable item located right in the Speed -> Optimization tab. With just one switch, Cloudflare will automatically compress data with Brotli when sending to end users, helping to reduce the load on your server.
In short, switching and choosing Brotli vs Gzip to compress website data is no longer a matter of "should" or "shouldn't", but "when" is reasonable. With the advantage of significantly better file compression, which directly improves page loading speed and Core Web Vitals score, Brotli is clearly the superior choice for most modern websites in 2026. Don't hesitate, check and upgrade your system immediately to bring the best user experience and score absolutely with Google.
Have you checked your website yet? Share your results and any difficulties you encounter in the comments section below, I will be there to help right away!
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