Free Online Developer &
DevOps Tools
Engineered for software developers, Linux sysadmins, and cloud architects. Format payloads, validate Kubernetes & Docker manifests, calculate permissions, and test network endpoints.No signup. No paywalls. 100% client-side privacy.
Popular Tools
The most frequently used utilities by developers and DevOps engineers.
JSON Formatter and Validator
Format, validate, beautify, and minify JSON with real-time error detection and line-by-line syntax diagnostics.
YAML Validator
Validate YAML syntax, detect indentation errors, and inspect parsed structures with instant error feedback.
YAML to JSON Converter
Convert YAML to JSON and JSON to YAML bidirectionally with formatting options and syntax checks.
Base64 Encoder and Decoder
Encode text to Base64 or decode Base64 strings to UTF-8 text with URL-safe mode and byte statistics.
JWT Decoder
Inspect JSON Web Tokens (JWT) headers, payloads, claims, and human-readable expiration dates in real time.
UUID / GUID Generator
Generate cryptographically secure Version 4 UUIDs in bulk with customizable casing, hyphens, and brackets.
Regex Tester & Debugger
Test and debug regular expressions in real time with regex flags, match tables, and common pattern presets.
Unix Timestamp Converter
Convert epoch seconds and milliseconds to human-readable UTC/local dates, or convert dates back to Unix timestamps.
Linux CHMOD Calculator
Calculate Linux file permissions with interactive read, write, execute checkboxes, octal numbers (755, 644), and chmod commands.
Cron Expression Generator & Explainer
Build and explain standard 5-field cron schedules with human-readable descriptions and next 5 run-time previews.
Docker Compose YAML Validator
Validate Docker Compose manifests, inspect services, volumes, networks, and environment syntax rules.
Nginx Configuration Helper
Generate secure, optimized Nginx server block configurations for reverse proxies, static sites, PHP-FPM, and SSL redirects.
SSL Certificate Expiry Checker
Inspect SSL/TLS certificates, expiry dates, issuing authority, Subject Alternative Names (SANs), and validity days remaining.
DNS Lookup Tool
Query DNS records (A, AAAA, CNAME, MX, TXT, NS, SOA) for any domain with authoritative answers and TTL values.
HTTP Header Checker & Security Audit
Inspect HTTP response headers, status codes, redirect chains, and security headers like HSTS, CSP, and X-Frame-Options.
IP Address Information Tool
Inspect IP address details, reverse DNS hostnames, network ranges, and determine your public IPv4/IPv6 address.
Developer Tools
Formatters, validators, encoders, and code utilities.
JSON Formatter and Validator
Format, validate, beautify, and minify JSON with real-time error detection and line-by-line syntax diagnostics.
YAML Validator
Validate YAML syntax, detect indentation errors, and inspect parsed structures with instant error feedback.
YAML to JSON Converter
Convert YAML to JSON and JSON to YAML bidirectionally with formatting options and syntax checks.
Base64 Encoder and Decoder
Encode text to Base64 or decode Base64 strings to UTF-8 text with URL-safe mode and byte statistics.
URL Encoder and Decoder
Encode and decode URLs and URI query parameters with query string parser and component separation.
JWT Decoder
Inspect JSON Web Tokens (JWT) headers, payloads, claims, and human-readable expiration dates in real time.
HTML / CSS / JavaScript Minifier
Minify and compress HTML, CSS, and JS code to eliminate whitespace, comments, and reduce payload bandwidth.
UUID / GUID Generator
Generate cryptographically secure Version 4 UUIDs in bulk with customizable casing, hyphens, and brackets.
Regex Tester & Debugger
Test and debug regular expressions in real time with regex flags, match tables, and common pattern presets.
Unix Timestamp Converter
Convert epoch seconds and milliseconds to human-readable UTC/local dates, or convert dates back to Unix timestamps.
DevOps & SysAdmin Tools
Calculators, server configs, and deployment linters.
Linux CHMOD Calculator
Calculate Linux file permissions with interactive read, write, execute checkboxes, octal numbers (755, 644), and chmod commands.
Cron Expression Generator & Explainer
Build and explain standard 5-field cron schedules with human-readable descriptions and next 5 run-time previews.
Docker Compose YAML Validator
Validate Docker Compose manifests, inspect services, volumes, networks, and environment syntax rules.
Nginx Configuration Helper
Generate secure, optimized Nginx server block configurations for reverse proxies, static sites, PHP-FPM, and SSL redirects.
Apache .htaccess Generator
Generate Apache .htaccess rules for HTTPS redirection, custom 404 pages, gzip caching, and security headers.
PHP Extensions & Requirements Checker
Scan and compare installed PHP extensions against requirements for WordPress, Laravel, Symfony, Drupal, and Nextcloud.
Web & Network Tools
Live SSL certificate auditing, DNS queries, and HTTP headers.
SSL Certificate Expiry Checker
Inspect SSL/TLS certificates, expiry dates, issuing authority, Subject Alternative Names (SANs), and validity days remaining.
DNS Lookup Tool
Query DNS records (A, AAAA, CNAME, MX, TXT, NS, SOA) for any domain with authoritative answers and TTL values.
HTTP Header Checker & Security Audit
Inspect HTTP response headers, status codes, redirect chains, and security headers like HSTS, CSP, and X-Frame-Options.
IP Address Information Tool
Inspect IP address details, reverse DNS hostnames, network ranges, and determine your public IPv4/IPv6 address.
Built for Modern Engineers Who Care About Speed & Privacy
Client-Side Privacy
Your tokens, JSON payloads, YAML configurations, and code are processed directly in your browser. No server logging, no cloud storage, and zero exposure.
Zero Latency
Execute conversions and calculations instantaneously without roundtripping through an API. Snappy keyboard shortcuts (⌘K) keep you in flow.
100% Free & Open
No subscription tiers, no credit cards, and no gated features. Every developer utility is available completely free of charge.
Frequently Asked Questions
Learn more about how OpsKitTools works and our data handling policies.
Are my sensitive tokens, JSON data, or passwords uploaded to a server?
No. The vast majority of OpsKitTools utilities (including JSON formatter, YAML validator, JWT decoder, Base64 encoder, CHMOD calculator, and minifiers) run entirely client-side using JavaScript in your own web browser. Your inputs never reach our backend servers.
Are there any limits on file size or usage frequency?
There are no artificial usage limits. Because computations are done locally on your CPU, you can process large JSON or YAML payloads without hitting server timeouts.
How does OpsKitTools monetize without charging users?
We keep the platform 100% free for everyone by showing non-intrusive, compliant advertisements through Google AdSense. We do not use deceptive clicks or block any tool functionality behind ads.
Can I use OpsKitTools offline or in a private Docker container?
Yes! OpsKitTools is built as a production-ready Next.js application that can be deployed via Docker in air-gapped or internal corporate intranets.