Website Uptime Checker
Check Your Website's Uptime — or Monitor It 24/7
Two ways to know if your site is up. Pick the one that fits what you need right now.
Right now · Free
Run a free uptime check
Paste a URL, get HTTP status, response time, and errors from up to 3 global locations — in seconds.
- Multi-location HTTP / HTTPS check
- Response code, errors, load time
- No signup. No login. No data retained.
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Ongoing · 30-day trial
Set up continuous uptime monitoring
Check every 1 minute from 30+ global locations. Instant alerts the moment something breaks — before customers notice.
- 30+ global locations · 1-minute checks
- Alerts: SMS, voice, Slack, Teams, PagerDuty
- 30-day free trial · No credit card
Full access · 24×7 expert support
Trusted by 10,000+ organizations · website monitoring since 1998
DELL
Comcast
Aflac
Citrix
VOLVO
Xerox
DISH
Choose your path
Which one fits your situation?
Both check your website's uptime — but they answer different questions.
Free uptime check (one-time)
Best for
"Is this URL up right now?" — a one-off check during a firefight, before launch, or when a customer reports an issue.
What you get
HTTP status code, response time, server response errors, element checks from up to 3 global locations.
Cost
Free. No login. No personal information retained.
Limits
Runs once when you click. No alerts. No history. No continuous coverage.
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dotcom-tools.com — a free tools site from the makers of Dotcom-Monitor.
Continuous uptime monitoring (Dotcom-Monitor)
Best for
"Tell my team the moment my site goes down" — production sites you can't afford to learn are broken from a customer complaint.
What you get
Checks every 1 minute from 30+ global locations, real-browser tests beyond pings, instant alerts in your team's channels, full incident history and SLA reporting.
Cost
30-day free trial — every premium feature, all alert channels, all locations. No credit card required.
Limits
Takes a couple of minutes to set up — but then you don't have to think about it again.
Powered by
Dotcom-Monitor — trusted by 10,000+ organizations since 1998.
FAQ
Website uptime checker — common questions
How do I check if my website is up right now?
Use the free web server test above — paste your URL and you'll get back the HTTP status code (200 means up; 4xx or 5xx signal a problem), response time, and element errors from up to 3 global locations in under 30 seconds. No signup required.
What's the difference between an uptime checker and uptime monitoring?
An uptime checker is a one-time test you run yourself to see if a site is responding right now. Uptime monitoring runs automatically and continuously — every 1–5 minutes from many global locations — and alerts your team the moment something breaks, so you don't have to keep refreshing.
Do I need to sign up to run the free uptime check?
No. The free web server test on dotcom-tools.com requires no signup and no personal information. You only need an account if you want to save test history, run continuous monitoring, or set up alerts.
What does Dotcom-Monitor's uptime monitoring give me beyond a one-time check?
Continuous checks every 1 minute from 30+ global locations, real-browser tests that catch JavaScript and checkout failures pings miss, instant alerts via email, SMS, voice, Slack, Microsoft Teams, PagerDuty, ServiceNow, and webhooks, and detailed waterfall and screenshot diagnostics for every incident.
What HTTP status codes mean a site is down?
A 200 OK means the server responded successfully. 4xx codes (like 404 or 401) usually indicate a problem with the request or a missing resource. 5xx codes (like 500, 502, 503, 504) indicate a server-side error — your site is effectively down for the user. A connection timeout or DNS failure means the request never reached the server at all.
Pick your path
Same answer to "is my site up?" — different commitment.