Built for developers,
by developers
devtools.zothnet.com is a free collection of PHP and web developer tools. No accounts, no ads, no paywalls. Every tool does one thing well and explains its output in plain English.
Why we built this
As solo developers and small web teams, we spend a lot of time looking up the same things — what does this PHP error mean, is this SPF record correct, why is this SSL cert throwing warnings, what does this HTTP status code do in PHP?
Most of the tools that exist for these tasks are bloated, require signups, show you ads, or just dump raw output without explaining what it means. We built the tools we wanted to use ourselves: fast, focused, and with plain-English explanations on every result.
devtools.zothnet.com is a project by ZothNET Solutions — we also publish PHP developer ebooks and courses at ebookshowto.com and courses.ebookshowto.com.
Our principles
The tools
We currently offer 27 tools covering PHP debugging, server configuration, email deliverability, DNS, SSL, security, encoding, and more. We add new tools regularly based on what we actually need in our own work.
- PHP error and MySQL error explainers with plain-English fixes
- Email deliverability checker — SPF, DKIM, DMARC, blacklists
- SSL certificate checker, DNS record lookup, HTTP header inspector
- Apache and Nginx config explainer, .htaccess rule tester
- PHP.ini security and performance auditor
- JSON formatter, Base64 encoder/decoder, regex tester
- Password strength checker (100% client-side — never sent to server)
- PHP version compatibility checker covering PHP 5.3 through 8.4
- HTTP status code reference, .env file validator, cron builder
Get in touch
Found a bug? Have a tool suggestion? Just want to say the site helped you? We'd genuinely love to hear from you.