By Zarivora
Free diagnostics for websites, domains and business email
Free tools to diagnose, understand and improve your website and digital business. Every check returns what is wrong, why it matters and what to do next — no account, no signup.
- Results in seconds
- Live checks run against your real domain.
- Actionable findings
- Each issue comes with the specific fix.
- Safe by design
- Read-only checks, nothing is modified.
Popular tools
The checks most people run first when something looks wrong.
Website Audit
Run one combined check across availability, HTTPS, SEO basics, security headers and response speed.
Website Health
Open ToolWebsite Down Checker
Check whether your website is online, reachable and returning the expected HTTP response.
Website Health
Open ToolWebsite Speed Test
Measure server response time, transfer time and page weight to see what is slowing your pages down.
Website Health
Open ToolMobile Website Checker
Check viewport configuration, responsive signals and mobile-hostile markup patterns.
Website Health
Open ToolBroken Link Checker
Scan the links on a page and report which ones return errors or fail to resolve.
Website Health
Open ToolSEO Checker
Inspect titles, meta descriptions, headings, canonicals and indexability signals.
SEO
Open ToolBrowse by category
Website Health
Availability, speed, mobile rendering and broken links.
SEO
Metadata, indexability and on-page technical signals.
Domain & DNS
DNS records, SSL certificates and HTTP responses.
MX, SPF, DKIM and DMARC deliverability records.
Security
Response headers, HTTPS enforcement and exposure checks.
Business
Planning and budgeting tools for digital projects.
Troubleshooting guides
Why Is My Website Down?
Work through the real causes of website downtime — DNS, expired domains, SSL, hosting limits and application errors — in the order that finds the fault fastest.
Why Is My Website Slow?
Separate server-side slowness from browser-side slowness, find the actual bottleneck, and fix the causes that matter most.
How to Improve Website Speed
A practical, ordered checklist for making a website faster — caching, compression, images, fonts, scripts and hosting.
How to Fix SSL Errors
Understand the common SSL and HTTPS browser errors, what causes each one, and the exact fix for each case.