Free Developer Tools & Diagnostic Utilities
Access our comprehensive catalog of 25+ free online developer utilities, DNS record checkers, email deliverability inspectors, and network diagnostics. From real-time Time to First Byte (TTFB) website speed audits to SPF 10-lookup validation and SSL certificate chain inspection, Pingzo provides high-performance web tooling engineered specifically for software developers, DevOps teams, SREs, and IT administrators with zero registration required.
Each utility in our developer directory runs in real time directly from high-capacity edge nodes or executes securely in your local browser sandbox. Validate recursive DNS lookups against strict RFC limits, inspect JWT claims without sending private tokens over the network, decode Cron schedules into plain English, and calculate subnets without intrusive advertisements or captive paywalls.
While one-off diagnostic checks are essential for day-to-day debugging, production services demand automated 24/7 reliability. Connect any critical endpoint to Pingzo's continuous uptime and latency monitoring platform to receive sub-15-second alerts via WhatsApp, Telegram, Slack, and Discord whenever unexpected outages or performance degradations occur.
Website Speed Test
Measure website load speed, Time to First Byte (TTFB), page weight, and compression efficiency in under 2 seconds. Zero waiting queue.
JWT Decoder
Decode and inspect JSON Web Token headers, payload claims, and check expiration values locally.
SSL Inspector
Verify SSL/TLS certificate chains, issuer details, security parameters, and expiration limits.
JSON Formatter
Prettify, format, validate, and minify raw JSON string payloads locally in your browser.
UUID / ULID Generator
Bulk generate cryptographically secure UUID v4 and lexicographically sortable ULID strings.
Regex Tester
Test, match, validate, and debug JavaScript regular expressions with real-time group highlights.
Cron Translator
Translate, humanize, and check simulated execution schedules for standard cron expression patterns.
DNS Lookup Utility
Query dynamic A, AAAA, MX, TXT, and CNAME records for any domain from root servers.
SPF Record Generator
Build and validate DNS Sender Policy Framework (SPF) rules to authenticate secure email delivery.
SPF Record Checker
Inspect domain SPF records, check the 10-lookup limit, identify syntax errors, and protect delivery.
DMARC Policy Checker
Verify DMARC enforcement (p=reject/quarantine), test subdomain apex fallback, and validate rua reporting.
DKIM Record Inspector
Inspect DKIM public keys across common and custom selectors, detect revoked keys, and check key strength.
CIDR Subnet Calculator
Calculate IP subnet address allocations, wildcard masks, host ranges, and join paths.
Website Uptime Checker
Check if any server endpoint is responding online from global network validation points.
HTTP Header Checker
Analyze HTTP request/response headers, security policy overrides, and server directives.
HTTP Status Checker
Verify server redirection loops, destination endpoints, and status code outputs.
Base64 Encoder & Decoder
Encode plain text or file parameters to base64 format and decode them back instantly.
Cron Expression Builder
Create and translate standard cron scheduler strings with an interactive calendar preview.
Robots.txt Generator
Produce crawling directives for Googlebot and other crawler agents to guide search indexers.
SLA Downtime Calculator
Map target service availability percentages to equivalent daily, weekly, or yearly down limits.
Webhook Tester
Register temporary HTTP callback targets to capture and inspect incoming webhook JSON payloads.
What Is My IP Address
Quickly find and inspect your public IP address, user agent params, and local network diagnostics.
Secure Password Generator
Generate strong, cryptographically secure random passwords and verify Shannon entropy strength locally.
Online Ping Test Tool
Ping any website or public server IP to check network round-trip latency and diagnostic packet loss.
Local Device IP Finder
Learn how to locate the local private IP address of your printer, router, smart TV, smart home, and console devices.