TTFB Checker

TTFB (Time to First Byte) measures the time from a browser requesting a page to when it receives the first byte of response. Good TTFB is under 800ms.

Use a CDN, enable server-side caching, optimize database queries, reduce server processing time, and upgrade to HTTP/2 or HTTP/3.

Yes. TTFB is part of the Largest Contentful Paint (LCP) measurement, which is a Core Web Vital. High TTFB directly delays LCP and can hurt search rankings.

Yes, the TTFB Checker is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The TTFB Checker processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the TTFB Checker is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the TTFB Checker in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Yes, the TTFB Checker is built following current Google Search guidelines and best practices. We regularly update the tool to reflect changes in search engine requirements.

The TTFB Checker works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

Google's field-data thresholds split TTFB into three bands: Good is under 800 ms, Needs Improvement is 800 ms to 1,800 ms, and Poor is anything over 1,800 ms. These are the same cutoffs Google applies when assessing real-user data, which is why hitting under 800 ms is the practical target for most sites. A reading in the Good band means your server starts replying quickly enough that it isn't holding back the rest of the page load. Bear in mind that TTFB varies by location, network, and server load, so it's worth sampling more than once rather than trusting a single number. This tool labels every result Good, Needs Improvement, or Poor against those exact thresholds, so you instantly see which band you fall into without memorizing the numbers.

A high total can come from several places, not just slow back-end code. TTFB covers the full round trip before the first byte arrives: the DNS lookup that resolves your domain to an IP, the TCP connection to the server, the TLS/SSL handshake for HTTPS, any redirects the request bounces through, and only then the server's processing time. A sluggish DNS resolver, an extra redirect hop, or a slow TLS negotiation can inflate the number even when your application responds quickly. Distance also matters: a visitor far from a single origin server pays for every network leg. Seeing the phases separately is the only reliable way to know where the time goes. This tool breaks your live reading into DNS, TCP, TLS/SSL, and redirect segments so you can pinpoint the real culprit instead of guessing.

The Navigation Timing API this tool reads can only time the page currently open in your own browser, because it reports timings your browser actually recorded. That means live, automatic readings always cover the page you're on, not a remote URL. To rate a competitor's site or any page you don't control, run that URL through a lab tool such as PageSpeed Insights or WebPageTest, both linked here, then take the TTFB they report and paste it into the manual checker. You'll get the same Good, Needs Improvement, or Poor verdict against Google's thresholds. This is the accurate approach, since no in-browser API can measure a request your browser never made. Use the manual input field to benchmark rivals, staging servers, or any external page in seconds.

TTFB measures only the very start of the journey: the gap between your browser sending the request and the first byte of the response coming back. Page load time measures the whole experience, including downloading the HTML, fetching CSS, JavaScript, images, and fonts, and rendering everything on screen. So TTFB is a single early checkpoint, while load time is the finish line. They're related but not interchangeable: a fast TTFB doesn't guarantee a fast page if heavy assets bloat the rest of the load, but a slow TTFB delays everything that follows, since nothing can render until that first byte lands. TTFB is also the opening component of Largest Contentful Paint. This tool isolates that first-byte interval so you can fix server responsiveness separately from front-end weight, then verify the change with a quick re-measure.

It's highly accurate for the page you're viewing, because it isn't a simulation. The tool reads the exact timings your browser already stored in its performance buffer through the Navigation Timing API, so the result reflects the actual round trip you just experienced on your real connection. That said, any single reading is a snapshot influenced by your location, network conditions, caching, and momentary server load. A request served from cache or after the connection is warm can look faster than a first-time visit. For a trustworthy picture, sample a few times and watch for consistency rather than fixating on one figure. Use the Re-Measure button to take fresh readings, and compare your live numbers against lab tools when you need server-side results independent of your own connection.