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DNS, email, ports, SSL, WHOIS and 30+ more tools — all in one place. Free web interface and powerful REST API.
7 tools in Text Tools
Text Analyzer
Count characters, words, sentences, paragraphs and lines. Character breakdown by type, reading time estimate, and average word length.
Water Checker
Analyze stop word density and water content in your text. Identify filler words that add no meaning to improve writing quality.
Word Density
Analyze word frequency and density in text. View top words, 2-word and 3-word phrases with occurrence counts and percentages.
Case Converter
Convert text between 12 case formats — UPPER, lower, Title, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and more.
Text Diff
Compare two texts side by side with line-by-line diff highlighting. See added, removed, and unchanged lines with similarity score.
Lorem Ipsum Generator
Generate Lorem Ipsum placeholder text — paragraphs, sentences, or words. Configurable count with optional classic opening.
Regex Tester
Test regular expressions online with live pattern matching. Free regex tester showing all matches with index positions, lengths, and captured groups.
Browse Tools by Category
DNS & Domain Tools (6)
Check DNS records, monitor propagation, perform reverse DNS lookups, query WHOIS data, and verify nameserver configurations for any domain worldwide.
Email & Deliverability Tools (8)
Validate MX records, check SPF/DKIM/DMARC policies, scan IP blacklists, analyze email headers, and run full email health diagnostics to fix deliverability issues.
Network & IP Tools (9)
Scan open ports, run ping and traceroute tests, geolocate IP addresses, look up ASN information, calculate subnets, and check your public IP — all from your browser.
Web & Security Tools (6)
Verify SSL/TLS certificates, inspect HTTP security headers, measure page load speed, detect web technologies, generate security scores, and check robots.txt configurations.
Images & Media Tools (11)
Convert between PNG, JPEG, WebP, and AVIF formats. Resize, crop, optimize, add watermarks, extract EXIF metadata, generate color palettes, and create placeholder images.
Text Tools Tools (7)
Analyze text readability and word count, check content for water words, calculate keyword density, convert letter case, compare text differences, and test regular expressions.
Utilities Tools (6)
Encode and decode Base64 and URLs, generate MD5/SHA hashes, format and validate JSON, create strong passwords, and generate UUIDs — essential developer utilities.
Free Network Diagnostic & Developer Tools Online
NetVizor provides a comprehensive suite of 53+ free online tools for network diagnostics, domain analysis, email troubleshooting, web security auditing, image processing, and developer utilities. Every tool works directly in your browser — no installation, no registration for basic use, and no ads.
DNS & Domain Tools: Our DNS lookup tool lets you query all record types (A, AAAA, MX, CNAME, TXT, NS, SOA) for any domain. Track DNS propagation across global resolvers after making changes. Perform reverse DNS lookups to find hostnames associated with IP addresses. Run WHOIS queries to discover domain ownership, registration dates, and registrar information. Check domain age and verify nameserver configurations — essential for domain research, migration planning, and troubleshooting DNS issues.
Email Diagnostics: Identify why emails bounce or land in spam. Check MX records to verify mail server configurations. Validate SPF records to prevent spoofing. Verify DKIM signatures to ensure email authenticity. Analyze DMARC policies for proper email security. Scan your domain or IP against 50+ DNS-based blacklists (Spamhaus, Barracuda, SORBS). Parse raw email headers to trace delivery paths. Our email health tool combines all checks into a single report card.
Network & Security: Scan open ports on any server to discover running services — check SSH (22), HTTP (80), HTTPS (443), SMTP (25), or custom port ranges. Measure server response time with ping. Trace routing paths with traceroute to identify network bottlenecks. Geolocate any IP address to find its country, city, ISP, and ASN. Verify SSL/TLS certificates and check expiration dates. Inspect HTTP response headers for security misconfigurations. Detect technologies powering any website.
REST API: All tools are available programmatically via our REST API. Get a free API key with 1,000 requests per month. Use it to automate SSL monitoring, DNS validation, port scanning, email health checks, and more in your scripts, CI/CD pipelines, or monitoring dashboards. Paid plans support up to 100,000 requests per month with higher rate limits and bulk endpoints.