Free Website Testing Tools
Free web testing tools that check your website, servers and network from locations around the world. Run a real-browser speed test, check server response time, ping, traceroute and DNS, and test email, FTP and streaming servers. No installation or sign-up needed.
Tools
Website Speed Test A real-browser website speed test from worldwide locations, with a waterfall, Core Web Vitals and Lighthouse. Web Server Test Check server response time, HTTP status and TLS for any HTTP or HTTPS website or API. Traceroute Test An online traceroute that shows every network hop with its latency and packet loss. DNS Trace Test Trace DNS from the root servers to your name servers and check that they agree. FTP Server Test Test FTP and FTPS server connection, login and directory listing. Email Server Test Test SMTP, IMAP and POP3 mail servers: connection, encryption and login. Streaming Media Test A video streaming test for HLS, DASH and media files: startup time and speed vs. bitrate. DNSBL Test Email blacklist check: see if your mail server IP is on major DNSBL spam blacklists. Ping Test An online ping test from multiple locations: latency and packet loss for any host. China Firewall Test See if your website, or parts of it, are blocked in China by loading it from mainland China.
At a glance
- 10 free tools: website speed (desktop and mobile), China firewall, web server, ping, traceroute, DNS trace, email server, email blacklist, FTP and streaming media tests.
- From outside your network: every test runs from Dotcom-Tools' monitoring locations, so you see what your visitors see.
- Several locations at once: compare up to 3 locations side by side without an account, up to 5 with a free account, and every location on a paid plan.
- Real browsers and real protocols: page loads in Chrome with Lighthouse, real ICMP ping and traceroute, real SMTP, IMAP, POP3 and FTP sessions.
- Detailed results: waterfalls, per-step timing, server replies and TLS certificate details, exportable as PDF, CSV and JSON.
- Free: no installation and no sign-up required.
Which website testing tool do I need?
| Question | Tool |
|---|---|
| How fast does my page load, and what slows it down? | Website Speed Test |
| How fast is my site on a phone over 4G or 3G? | Mobile Website Speed Test |
| Is my server up, and how fast does it respond? | Web Server Test |
| Can the server be reached, and what is the latency? | Ping Test |
| Where on the network path is the delay or packet loss? | Traceroute Test |
| Are my DNS records correct and fully propagated? | DNS Trace Test |
| Is my mail server reachable, with working TLS and login? | Email Server Test |
| Is my mail server's IP on a spam blacklist? | Email Blacklist Check |
| Can users connect and log in to my FTP server? | FTP Server Test |
| Will my video stream play without buffering? | Streaming Media Test |
| Is my website blocked in China? | China Firewall Test |
What makes these web testing tools different
- Tests run from many places at once. A test from your own computer only shows one network path. Dotcom-Tools runs the same test from several locations at the same time, so you can tell a server problem (slow everywhere) from a regional network problem (slow in one place).
- Real browsers, not estimates. The website speed test loads your page in Chrome and records every request, the filmstrip, a video and the Lighthouse report.
- Real protocol conversations. Email, FTP and DNS tests talk to your servers the way clients and resolvers do, and show every reply, so you can see the exact step that fails.
- Safe to use. Tests only reach public addresses, passwords are encrypted and masked in shared results, and the email test never sends a message.
Free account
The tools work without an account. A free account adds up to five locations per test, a larger daily test allowance, test history, shareable result links, rerun and edit options, and side-by-side comparison of up to five results. Create a free account. Paid plans and OnDemand credits add every location, scheduled tests, 13 months of history and API access (pricing).
From one-off tests to 24/7 monitoring
Dotcom-Tools is built by Dotcom-Monitor, which has provided website monitoring for over 20 years. The free tools are one-off tests. To check your websites, servers and APIs around the clock and get alerts when something breaks, use Dotcom-Monitor. To stress test a website or API with thousands of concurrent users, use LoadView.
Frequently asked questions
What are website testing tools?
Website testing tools check how a website and its infrastructure perform: how fast pages load, whether servers respond, and whether DNS, email and network paths work. Dotcom-Tools runs these tests from locations around the world so you see results from your visitors' point of view.
Are the Dotcom-Tools website testing tools free?
Yes. All tools are free to use without signing up, with up to three locations per test. A free account adds up to five locations per test, test history, sharing and comparison.
Which tool should I use if my website is slow?
Start with the Website Speed Test: it shows the load time, Core Web Vitals and a waterfall of every request. If the first request is slow, check the server with the Web Server Test; if only some locations are slow, use the Ping and Traceroute tests.
Can I stress test or load test my website here?
No. The free tools run one test per location. To simulate hundreds or thousands of concurrent visitors, use LoadView, Dotcom-Monitor's cloud load testing service.
Where do the tests run from?
From Dotcom-Monitor's monitoring locations in several regions of the world, including locations inside mainland China for the China Firewall Test. You choose the locations for each test.
Can I test internal or private websites?
No. The tools only test public websites and servers. Private network addresses, such as 10.x.x.x or 192.168.x.x, and internal host names are rejected.
Who makes Dotcom-Tools?
Dotcom-Tools is a free service from Dotcom-Monitor, a provider of website, application and infrastructure monitoring, and the maker of the LoadView load testing platform.
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