About Free SEO, DNS & Email Tools — Web Tool Bench
Free SEO, DNS & Email Tools — Web Tool Bench is a collection of free diagnostic tools and calculators for people who run websites — developers, system administrators, agency staff and business owners who ended up looking after their own hosting.
The problem this site exists to solve
Most online tools give you an answer and stop there.
You run a DNS lookup and get a wall of records. You check an email domain and get a red cross next to "DMARC". You generate an .htaccess file and get a block of directives. In each case you now have output you cannot act on, because nobody told you what it means, whether it matters, or what to do next.
That gap is not a small one. Knowing your domain has no DMARC record is only useful if you also know what DMARC does, what a sensible first policy looks like, and why setting the strictest option immediately will block your own invoicing system. The lookup takes two seconds. Understanding the result is the actual work.
Every page here is built around the second part. The result is where the page starts, not where it ends.
What that means in practice
Each tool page includes a worked example with real input and real output, an explanation of how to read what you are seeing, the failure modes that are easy to miss, and answers to the questions people actually ask about that specific tool.
The .htaccess generator does not just emit rules — it warns you that HSTS cannot be undone once a browser has cached it, that the uploads rule belongs in wp-content/uploads/ and will take your site down if you put it in the root, and that a year-long cache lifetime on unversioned CSS means returning visitors keep the old file for a year.
Those warnings exist because they are the mistakes that cost people a working site.
How the tools work
Live lookups. DNS, WHOIS, SSL certificate and HTTP header checks query real servers at the moment you press the button. There is no cached layer in between, which is why they show a DNS change before your own computer does.
Local processing. Generators and calculators process the values you type and return a result. Nothing is stored.
No accounts. No tool requires registration, and none saves what you enter. There is no usage quota and no upsell to a paid tier, because there is no paid tier.
Who runs this
Free SEO, DNS & Email Tools — Web Tool Bench is built and maintained by Sanan, based in United States.
How it is funded
Free SEO, DNS & Email Tools — Web Tool Bench is free and carries advertising. Some pages also link to hosting services, and where a link is commercial it is marked rel="sponsored" and disclosed.
Advertising has no influence on tool output. A domain-availability result is whatever WHOIS returned; a deliverability grade is calculated from your actual DNS records. If a tool told you what an advertiser wanted rather than what your server said, the site would be worthless — including to the advertiser.
Corrections
If a tool returns a result you believe is wrong, please report it. Include what you entered, what you got, and what you expected. Reproducible reports get fixed quickly; the [contact page](https://www.webtoolbench.com/contact) explains how to reach us.