Available tools
Paste any PHP error message and get a plain-English explanation, the common causes, and a working code fix. Covers the 40 most common PHP errors.
Paste any MySQL or MariaDB error and get a plain-English explanation, the common causes, and a working SQL or PHP fix. Covers connection, syntax, constraint, lock, and privilege errors.
Look up A, AAAA, MX, TXT, CNAME, NS, SOA and PTR records for any domain. Includes plain-English explanations and automatic SPF, DKIM, and DMARC analysis.
Check your domain's email setup — MX, SPF, DKIM, DMARC, reverse DNS, and blacklist status. Get a deliverability score and plain-English fixes for every issue found.
Paste your .htaccess rules and a test URL to see exactly which rules match, why, and what the final rewritten URL will be. Every directive explained in plain English.
Build or decode a cron schedule visually. Get a plain-English description of when it runs and the next 5 scheduled times.
Enter any domain and instantly check SSL cert validity, expiry date, issuer, trust status, and which domains the cert covers.
Fetch and validate any site's robots.txt. Every directive explained in plain English, errors and warnings highlighted, sitemaps listed.
Test PCRE regular expressions against real text using PHP's own engine. Match, replace, and split modes. Every token explained in plain English, plus a library of 15 common patterns.
Every HTTP status code explained in plain English — what it means, common causes, and how to send it in PHP. Search all 40+ codes or filter by category. Great for API development.
Paste your .env file to check for syntax errors, duplicate keys, unquoted values with spaces, unfilled placeholders, and empty required variables. Lists all parsed variables.
Split large MySQL SQL dump files into smaller importable chunks. Fixes max_allowed_packet errors and phpMyAdmin upload limits. Each chunk is ready to import in order.
Paste two blocks of text and see exactly what changed. Line-by-line diff with added, removed, and unchanged lines highlighted. Great for comparing config files, SQL, or code.
Live Markdown editor with instant preview. Write Markdown on the left, see rendered HTML on the right. Full toolbar, table support, code blocks, and HTML copy. Nothing sent to server.
Format messy one-liner SQL into clean, indented, syntax-highlighted SQL. Supports SELECT, INSERT, UPDATE, DELETE, CREATE, and complex JOINs. Great for debugging ORM queries.
Convert text between camelCase, snake_case, PascalCase, kebab-case, SCREAMING_SNAKE, Title Case, dot.case, path/case and more. Works from any starting format.
URL encode or decode strings using urlencode, rawurlencode, and base64. Parse any URL into components and query parameters. Plain-English explanation of each encoding type.
Calculate MD5, SHA-1, SHA-256, SHA-512, SHA3-256, and CRC32 hashes from any text. Plain-English explanation of each algorithm, when to use it, and when to avoid it.
Generate BCrypt password hashes using PHP password_hash(), or verify a password against an existing hash. Choose cost factor 4-16. The right way to hash passwords in PHP.
Paste PHP code to find deprecated or removed functions, syntax, and features across PHP 5.3–8.4. Plain-English explanations and replacement suggestions for every issue found.
Paste any Apache vhost or Nginx server block and get every directive explained in plain English. Auto-detects config type. Includes security checks and 90+ directives covered.
Paste your php.ini for a security and performance audit. Checks 20+ directives including display_errors, allow_url_include, OPcache, session security, and memory limits — all explained in plain English.
Check password strength instantly in your browser — entropy, crack time estimates, character analysis, and improvement tips. 100% private: nothing is sent to any server.
Encode text or files to Base64, or decode Base64 back to plain text. Supports standard and URL-safe Base64, file encoding, image preview, and data URI generation.
Format, validate, and explore JSON data. Instant pretty-printing, minification, syntax highlighting, error detection with plain-English explanations, and structure stats.
Decode and inspect JSON Web Tokens instantly. View header, payload, claims, expiry status, and algorithm details. 100% private — nothing leaves your browser.
Enter any URL and see all HTTP response headers with plain-English explanations, a security score, redirect chain, and a full security checklist.
These tools come from real problems solved in real projects. The ebooks go deeper — written by a solo developer, for solo developers.