Measures your internet connection’s download speed and latency by downloading a test file from a CDN. Upload speed is not currently measured. Uses cloud-based processing.
Content reviewed October 2026 · About Toolzum
Convert between hundreds of units — length, mass, volume, temperature, area, speed, time, digital data, and more with a single click.
Run JavaScript speed benchmarks across five workloads with ops/sec scores. Prove which device runs faster — local measurement, free, no signup.
Generate arithmetic, geometric, and custom number sequences with sums. Fill spreadsheets and test series — free, local, no signup.
Generate natural-sounding speech from text using your browser's built-in voices. Adjust speed and pitch — download your text as .txt.
Provides an interactive environment where users can write a regular expression pattern, test it against sample strings, and view real-time match. Code never leaves your device — formatting and validation run locally in your browser.
Nothing of yours is uploaded or stored. The test downloads sample files from a CDN to measure throughput — that test traffic is the measurement itself, and no personal data leaves your browser.
Download speed and latency against CDN test files. Upload speed is not currently measured.
Throughput depends on network congestion, Wi-Fi conditions, VPNs, and device load. Run twice and take the better reading for a fair number.
Not currently — it measures download speed and latency using a CDN test file.
Latency pings the delay-zero probe endpoint with a 10-second ceiling, falling back to 45 ms estimated when blocked; speed downloads the roughly 1.2 MB CDN image at 1000 by 1000 with a 30-second abort (progress maps received bytes over 1200000 to the middle of the bar), and the display caps at 950 Mbps. Example: 1200000 bytes in 2 seconds computes to about 4.6 Mbps before the cap.
Benchmark Builder
Run JavaScript speed benchmarks across five workloads with ops/sec scores. Prove which device runs faster — local measurement, free, no signup.
IP Address Lookup
Displays your public IPv4 and IPv6 addresses with geolocation data (city, ISP, ASN, timezone). Network engineers use it to verify VPN connectivity. Uses cloud-based processing.