GZIP / Brotli + Page Size Checker
Is your page sent as small as it can be?
Check whether a page is compressed with Gzip or Brotli, how many bytes it really sends, and what the rest of the page weighs
Enter a page to analyze
We request the page separately as a Brotli, Gzip and Zstandard client and count the real bytes the server sends, so the figures reflect what a browser downloads. Measuring assets looks at up to 40 files and can take a few seconds longer.
Fetching the page…
Size summary
-
HTML (uncompressed)
-
HTML actually sent
-
Saved by compression
-
Measured page weight
Compression support
Findings
Response details
Smaller pages are only one part of speed
Run a complete audit to check performance, mobile-friendliness, meta tags, and more.
Run Free Website AuditAbout GZIP / Brotli + Page Size Checker
Text files such as HTML, CSS and JavaScript compress extremely well, often shrinking by 70 to 90
percent. When a web server compresses them with Gzip or Brotli before sending, pages download faster,
use less mobile data, and cost less bandwidth. This tool requests your page the way a browser does,
once for each compression format, and counts the real bytes that come back, so you see exactly which
formats your server supports and how much each one saves. It compares that against the uncompressed
size, checks whether the Vary: Accept-Encoding header is set so caches behave, and, if you
like, measures the CSS, JavaScript, images and fonts the page loads to estimate total page weight and
point out files that are uncompressed or oversized. Total weight counts only the assets that could be
measured, so treat it as a lower bound for pages that load content with JavaScript.
Brotli or Gzip: which should I use?
Gzip is supported everywhere. Brotli usually produces smaller text files and is supported by all modern browsers over HTTPS. The best setup serves Brotli to browsers that ask for it and falls back to Gzip for the rest.
How do I enable Gzip on my server?
On Nginx, add this to your http or server block:
gzip on;
gzip_comp_level 5;
gzip_min_length 256;
gzip_vary on;
gzip_types text/css application/javascript application/json image/svg+xml font/ttf font/otf application/xml;
On Apache, enable mod_deflate:
AddOutputFilterByType DEFLATE text/html text/css application/javascript application/json image/svg+xml font/ttf font/otf
Many CDNs and hosting platforms, such as Cloudflare, also offer a one-click compression setting.
Why are my images not compressed?
JPEG, PNG, WebP and AVIF files are already compressed, and applying Gzip to them gains almost nothing. Reduce them by resizing and by using modern formats instead.
Why does the page say too small to need compression?
For responses under about 1 KB, compression saves almost nothing and many servers skip it on purpose, so it is not counted against you.