TTFB Speed Tester

What is TTFB (Time To First Byte)?

TTFB (Time To First Byte) measures the time in milliseconds between a browser sending an HTTP request and receiving the first byte of data from the server. It's a core web performance metric featured in Google's Core Web Vitals. This TTFB speed tester lets you measure server response time instantly — just enter a URL — and grades the result as Good, Average, or Needs Work. Faster TTFB means better user experience and a positive impact on SEO rankings.

Common Use Cases

How to Use

1. 1
   Enter the URL

   Type or paste the website address into the input field. The https:// prefix is added automatically if omitted, and you can also press Enter to start the test immediately.
2. 2
   Run the test

   Click 'Run Test' to trigger a real HTTP request from the server side and measure the time until the first byte of the response is received, reported in milliseconds.
3. 3
   Interpret the grade

   Review the color-coded grade alongside your TTFB value: 🟢 under 200ms is 'Good', 🟡 200–500ms is 'Average', and 🔴 above 500ms is 'Needs Improvement' per Google Core Web Vitals guidelines.
4. 4
   Compare history & optimize

   The test history log keeps your last 10 measurements so you can compare TTFB before and after applying a CDN, changing server settings, or migrating hosts to verify real-world improvements.

Frequently Asked Questions