TTFB (Time to First Byte) measures the time from sending an HTTP request to receiving the first byte of the server response. Lower is better — under 200ms is considered fast.

What is a good TTFB score?

A TTFB under 200ms is excellent, 200–500ms is acceptable, and over 800ms may indicate server performance issues.

How does the TTFB Checker work?

Enter a URL and the checker pings it from up to 20 global locations, measuring the time to first byte from each. This helps identify regional latency issues and CDN performance.

Is TTFB a Google ranking factor?

TTFB contributes to Core Web Vitals, particularly LCP (Largest Contentful Paint). Slow TTFB can hurt your LCP score, which is a confirmed Google ranking signal.

TTFB Checker — Free Online Website Speed Tool

How to Use ttfb-checker

Paste or enter your input into the text field.
Configure any options (format, delimiter, encoding, or mode) using the controls above the output.
The result updates instantly — no submit button required for most operations.
Click Copy or Download to take the output to your next step.

TTFB Checker allows you to measure your server response time from 20 strategic locations around the world. This free online website speed tool provides a comprehensive breakdown of connection phases, including DNS lookup, TCP handshake, and TLS negotiation. Understanding your Time to First Byte is crucial for identifying regional latency and optimizing your global CDN performance.

Global Website Performance Insights

This server response time test helps you troubleshoot slow loading speeds that could impact your Core Web Vitals and SEO rankings. Results are displayed on an interactive map, highlighting any regional bottlenecks or routing issues. The checker also reports CDN cache status and key HTTP headers, making it an essential utility for web developers and site owners monitoring global accessibility.

Real-time TTFB testing from 20 global probe locations
Visual map representation of regional latency scores
Detailed timing breakdown (DNS, TCP, TLS, TTFB, Download)
CDN cache status and response header inspection
Zero sign-up required for instant performance auditing

Frequently Asked Questions

What does ttfb-checker do?

ttfb-checker test time to first byte from up to 20 global locations — see response time, cdn cache status, and http headers. Results appear immediately — no page reloads, no waiting for a server response.

What input does ttfb-checker accept?

Paste text directly into the input field, or type your data. Most operations handle Unicode, special characters, and multi-line inputs without issue.

How large an input can I process?

There is no hard limit imposed by this tool. Very large inputs (multi-MB text) process within your browser's available memory. For files larger than 50 MB, a command-line tool may be faster.

Can I download the output?

Yes — every output panel includes a Copy to Clipboard button and a Download as file option. Outputs are saved as plain text or the appropriate file format for the operation.

Whether you are optimizing a global rollout or auditing a local server, this free online TTFB checker provides the network insights you need.

TTFB Checker online

Test Time to First Byte from up to 20 global locations — see response time, CDN cache status, and HTTP headers