Performance

TTFB Checker

Enter any URL and we'll measure how long the server takes to return its headers — Time To First Byte. Google's target is under 800ms.

What is a TTFB checker?

A TTFB checker measures Time To First Byte — how long the server takes to send the first byte after a request. This free TTFB test lets you check TTFB for any URL and test TTFB online.

Diagnose & fix a slow server response

A high time to first byte delays everything after it, including LCP. Reduce it with caching and a CDN, faster hosting, optimized database queries, HTTP/2/3, and fewer redirects. Re-test after each change to confirm the improvement.

What's a good TTFB?

Aim for under 800ms (under 200ms is excellent). TTFB underpins your Core Web Vitals, so improving it speeds up the whole page.

More Core Web Vitals tools

Check the rest: LCP Checker, CLS Checker, INP Checker, and the full Page Speed Test.

Frequently asked questions

A TTFB checker measures Time To First Byte — how long the server takes to return the first byte of the response after a request. This free TTFB test reports your server response time so you can check how fast your hosting and backend respond.
Google's guideline is under 800ms; under 200ms is excellent. A high TTFB delays everything that follows (including LCP), so it's one of the first things to fix when a page feels slow.
Use caching (page/object cache, CDN), upgrade slow hosting, optimize database queries and server code, enable HTTP/2 or HTTP/3, and keep redirects to a minimum. Each reduces the time before the first byte arrives.
Completely free and online, with no account required. It's part of WebsiteAuditTools' free suite of Core Web Vitals and performance tools.