gzip Compression Checker
Check whether gzip compression is enabled
Features
Instantly determine whether compression is applied
Just enter a URL to instantly check the compression state when served
Display size before and after compression
Measure the byte count after compression and after decompression to visualize transfer volume
Automatically calculate the compression ratio
Show the amount of data reduced from the difference before and after compression as a percentage
Support for methods other than gzip
Also detects deflate and Brotli compression and shows the method name
How to use
Enter a URL in the input field
Enter the URL of the page whose compression state you want to check in the input field
Run the check button
Press the check button and the server fetches the page to determine the result
Check the result and details
Check the enabled/disabled result along with header information such as size and compression ratio
Use cases
Checking display speed improvements
Inspect whether compression is applied to understand the room for faster loading through reduced transfer volume
Verifying server settings
Check whether settings are correctly applied after enabling compression
Researching competitor sites
Compare other sites' compression settings and ratios as a reference for improvement
Pre-inspection for SEO improvement
Understand the compression state that affects page speed before taking measures
Basic Knowledge
What is gzip compression?
gzip is a mechanism where the server compresses text such as HTML and CSS before sending it to the browser, reducing the size to approximately one-third, which speeds up display and reduces data usage. The receiving browser automatically decompresses it, so the appearance remains unchanged.
Other compression methods like Brotli
In recent years, Brotli (br), which has a higher compression ratio than gzip, is also widely used. You can check which compression method was used by looking at the Content-Encoding value in the response header.
Safety and privacy
Server-side processing
Input is processed on the server; only information necessary for the inquiry is sent.
Temporary processing only
For fetching and analyzing the page, temporary processing occurs on the server, then data is discarded after results are returned.
Communications encrypted with HTTPS
All sent and received data is encrypted by TLS and cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
Access only to the entered URL
Accesses only the entered URL from our service's server to check the compression state
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Can be used for commercial purposes such as research, calculation, processing, and conversion in business and production.
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If using in streaming and videos
Link to RAKKOTOOLS in the description, or Mention or display that you are using RAKKOTOOLS in the stream or video.
Credit example for the description
Usage guidelinesYou are free to use it for normal purposes. However, use for purposes that violate laws, infringe on third-party rights, impose significant load on the service, or otherwise interfere with service operation is prohibited.
We do not guarantee the accuracy or completeness of information and calculation results obtained from each tool.
This notice is a translation of the original Japanese text. If there is any discrepancy between the translation and the original, the Japanese original takes precedence.