# Internet Speed Test

> Measure your download speed, latency, and jitter in the browser. Download-only: nothing is uploaded and nothing is tracked.

URL: https://uttir.com/internet-speed-test
Categories: network-tools, web-tools
Privacy: The test downloads anonymous random bytes from public CDN endpoints and measures timing in your browser. Nothing is uploaded, no account is needed, and nothing about you is tracked.

## About

This speed test measures how fast your connection can pull data: download bandwidth in megabits per second, plus latency (response time) and jitter (how much that response time wobbles). Those three numbers cover what matters for streaming, downloads, video calls, and gaming.

It is deliberately download-only. Your upload bandwidth is never measured, so none of your data ever leaves your device — the test only receives anonymous random bytes from large public CDN endpoints and times how quickly they arrive. There is no account, no saved history, and no tracking.

The download phase uses several parallel connections and an adaptive transfer size: quick connections pull more data automatically so the reading stays accurate on fast lines, while slower connections finish fast without wasting your mobile data.

## How to use

1. **Pick a test size** — Quick uses about 30 MB of data. Full downloads more for a more stable reading on very fast connections.
2. **Start the test** — Latency is measured first, then the download phase runs with live results.
3. **Read the results** — You get Mbps, median latency, and jitter, plus a plain-language verdict for streaming and downloads.
4. **Compare fairly** — Run the test twice — once on Wi-Fi and once on a wired connection — to see the real difference.

## Examples

### Reading your score

What the numbers mean in practice.

Output:

```
Under 25 Mbps: fine for browsing and HD streaming. 25-100: comfortable 4K. 100+: multiple heavy users at once. Latency under 30 ms feels instant; jitter under 5 ms is excellent for calls.
```

## FAQ

### Why is there no upload test?

An upload test works by sending data from your device to a server — that is the part most speed tests use to build profiles. This tool measures the direction that matters for streaming and downloads (download) and skips uploading entirely, so nothing of yours is ever transmitted or stored.

### How much data does a test use?

The quick test transfers roughly 30 MB; the full test up to about 90 MB on very fast connections. On a metered mobile connection, prefer the quick test.

### Why are my results lower than my plan speed?

Wi-Fi, an old router, other devices using the connection, and your ISP's routing all shave bandwidth. Plans are also advertised in "up to" numbers. A wired connection test shows what your line actually delivers.

### What is jitter, and why does it matter?

Jitter is the variation in response time between requests. Low jitter makes video calls and game input feel steady; high jitter causes stutters even on fast lines. It is measured from a series of quick ping requests before the download phase.

## Related tools

- [Network Latency Test](https://uttir.com/network-latency-test) — Ping several well-known endpoints from your browser and compare round-trip times to work out whether a slowdown is you or them.
- [API Tester (HTTP Requests)](https://uttir.com/api-tester) — Make HTTP requests from your browser: GET, POST, PUT, DELETE, with custom headers and body. Import a cURL command, see the full response (status, headers, body) with timing. Free, in browser, no signup.
- [IP Geolocation Lookup](https://uttir.com/ip-geolocation-lookup) — Look up geolocation info for any IPv4 or IPv6 address — country, city, ISP, ASN, timezone. Free, runs in your browser.
- [DNS Lookup](https://uttir.com/dns-lookup) — Query DNS records (A, AAAA, MX, TXT, NS, CNAME, SOA, CAA) for any domain using Google DNS-over-HTTPS.

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For the full HTML page with the live tool, visit https://uttir.com/internet-speed-test.
This file is the markdown rendering at https://uttir.com/internet-speed-test.md. See https://uttir.com/llms.txt for a site-wide summary.