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 — Time to First Byte from 20 Global Locations

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.

Test Time to First Byte from up to 20 global locations — see response time, CDN cache status, and HTTP headers. No account needed — all processing happens locally in your browser and your input is never transmitted.

How ttfb-checker Works

ttfb-checker is a browser-side network utility built for speed and simplicity. Paste your input and the result appears within milliseconds. The tool handles edge cases — empty inputs, special characters, large datasets — without crashing or producing silent incorrect output. If you need a related operation, check the Related Tools section below.

Accepts large inputs — no size limits imposed by this tool
Handles edge cases: empty fields, special characters, and Unicode
Copy-to-clipboard and file download for every output
Works on Chrome, Firefox, Safari, and Edge without any extensions

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.

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