General Developer Utilities

General Developer Utilities Processed in your browser

Cron Expression Humanizer & Next Runs

Translate crontab 5-field syntax into plain human language and calculate next execution times.

General Developer Utilities Processed in your browser

Content Security Policy (CSP) Generator

Build and test HTTP Content-Security-Policy header rules to protect web apps from XSS.

General Developer Utilities Processed in your browser

Visual Git Command Cheat Builder

Interactive visual builder for complex Git commands: undo commits, rebase, stash, and cherry-pick.

General Developer Utilities Processed in your browser

.htaccess 301 Redirect & Rewrite Generator

Generate Apache .htaccess redirect rules, HTTPS enforcement, non-www, and rewrite configurations.

General Developer Utilities Processed in your browser

HTTP Status Code Reference & Header Inspector

Searchable HTTP status codes reference (1xx to 5xx) with RFC specs and cache behaviors.

General Developer Utilities Processed in your browser

OpenGraph & Social Meta Tags Previewer

Generate and preview OpenGraph, Twitter Card, and SEO meta tags for social media sharing.

General Developer Utilities Processed in your browser

Robots.txt Tester & Validator

Test and validate robots.txt crawl rules against specific User-Agents and URL paths.

General Developer Utilities Processed in your browser

Semantic Versioning (SemVer) Range Comparator

Test package versions against SemVer range constraints (^, ~, >=) and compare releases.

General Developer Utilities Processed in your browser

URL Query Parameter Parser & Reconstructor

Breakdown complex URLs into editable key-value tables and reconstruct clean query URLs.

General Developer Utilities Processed in your browser

SEO URL Slug Cleaner & Formatter

Clean, normalize, and transliterate strings into SEO-friendly URL slugs.

General Developer Utilities Processed in your browser

XML Sitemap Validator & Inspector

Parse and validate XML sitemaps, checking URLs, lastmod, priority, and syntax integrity.

General Developer Utilities Processed in your browser

Cron Expression Parser & Visualizer

Parse cron expressions into human-readable English, calculate next execution dates, and build cron schedules interactively.

General Developer Utilities Processed in your browser

.gitignore File Template Generator

Generate optimized .gitignore files for Node.js, Python, Laravel, Go, Rust, macOS, and IDEs with zero cloud dependency.

General Developer Utilities Processed in your browser

Unix Timestamp & Epoch Converter

Convert Unix epoch timestamps to human-readable dates (UTC and local) and parse dates to timestamps with a live clock ticker.

General Developer Utilities Processed in your browser

CSS Minifier & Formatter

Minify, compress, or beautify CSS stylesheets online with color optimization, zero-unit cleanup, and live savings metrics.

General Developer Utilities Processed in your browser

HTML Minifier & Code Compressor

Minify and compress HTML markup by stripping comments, extra spaces, and redundant whitespace with live byte savings calculation.

General Developer Utilities Processed in your browser

Bandwidth & Download Time Calculator

Calculate download and upload transfer times for any file size across Gigabit fiber, broadband, 5G, and Starlink internet speeds.

General Developer Utilities Processed in your browser

User-Agent String Parser & Client Inspector

Parse and decode browser User-Agent strings into browser, operating system, device, and engine metadata.

General Developer Utilities Processed in your browser

JavaScript KeyCode, Event Key & Code Detector

Inspect JavaScript KeyboardEvent properties in real time, including event.key, event.code, keyCode, and modifier keys.

General Developer Utilities Processed in your browser

JavaScript String Obfuscator & Hex Encoder

Obfuscate strings and sensitive text into JavaScript Hex escapes, Unicode, charCode arrays, and Base64 eval wrappers.

General Developer Utilities Processed in your browser

IPv4 Subnet & CIDR Network Calculator

Calculate IPv4 subnets, CIDR blocks, usable IP host ranges, broadcast addresses, and netmasks with binary decomposition.

General Developer Utilities Processed in your browser

Linux Chmod Permissions Calculator

Calculate Linux file permissions in octal (755, 644) and symbolic (rwxr-xr-x) format with interactive checkboxes and command generator.

General Developer Utilities Processed in your browser

Bandwidth & File Transfer Time Estimator

Estimate download and upload durations for files, databases, and media across network speeds and connections.

General Developer Utilities Processed in your browser

DNS SPF, DKIM & DMARC Record Generator

Generate and validate email security DNS records: Sender Policy Framework (SPF), DKIM selectors, and DMARC enforcement policies.

General Developer Utilities Processed in your browser

IPv6 Subnet & Prefix Calculator

Calculate IPv6 subnet prefix lengths, network ranges, total addresses, compressed/expanded notation, and reverse DNS nibble formats.

General Developer Utilities Processed in your browser

HAR File Viewer & Waterfall Inspector

Inspect and visualize HTTP Archive (.har) files with interactive network waterfalls, latency breakdowns (TTFB, DNS, SSL), headers, and payload sizes.

General Developer Utilities Processed in your browser

JWT RSA & ECDSA Key Pair Generator

Generate cryptographic RSA and ECDSA key pairs in PEM (PKCS#8 & SPKI) format client-side using the Web Crypto API.

General Developer Utilities Processed in your browser

MAC Address OUI Lookup & Generator

Lookup MAC hardware vendor (OUI), validate formats (colon, hyphen, dot), and generate random valid unicast or multicast MAC addresses.

General Developer Utilities Processed in your browser

MIME Type & File Extension Lookup Dictionary

Fast searchable dictionary mapping file extensions to MIME media types with Content-Type headers and web server configuration.

General Developer Utilities Processed in your browser

IPv4 Subnet Mask & Wildcard Calculator

Calculate IPv4 subnet masks, wildcard masks for Cisco ACLs, CIDR prefixes, host ranges, and broadcast IPs.

General Developer Utilities Processed in your browser

Cron Expression Generator & Visual Scheduler

Visual cron schedule builder. Interactively configure minutes, hours, days, and weekdays with instant cron syntax, plain English explanations, and next execution times.

General Developer Utilities Processed in your browser

Open Graph & Social Media Card Previewer

Preview how your website meta tags and Open Graph cards appear on X (Twitter), Facebook, LinkedIn, Discord, and Google with instant HTML meta tag generation.

General Developer Utilities Processed in your browser

User-Agent Generator & Random Header Maker

Generate modern, authentic User-Agent strings for Chrome, Firefox, Safari, Edge across Windows, macOS, Linux, iOS, and Android.

General Developer Utilities Processed in your browser

SVG to Data URI & CSS Background Converter

Convert raw SVG XML or files into URL-encoded SVG Data URIs, Base64 strings, and CSS background-image declarations.

General Developer Utilities Processed in your browser

ZIP Archive Maker & Extractor

Create and extract ZIP archives directly in your browser. Compress multiple files into ZIP or unpack ZIP contents privately without server uploads.

General Developer Utilities Processed in your browser

Audio Waveform Visualizer & Peak Inspector

Upload audio files (MP3, WAV, OGG) to render high-resolution amplitude waveforms and inspect duration, sample rate, and peak channels.

General Developer Utilities Processed in your browser

IPv4 to IPv6 Address Converter

Convert IPv4 addresses into IPv4-Mapped IPv6, IPv4-Compatible, 6to4 prefix notation, and expanded 128-bit hexadecimal.

General Developer Utilities Processed in your browser

NGINX Config Formatter & Beautifier

Format, indent, and beautify NGINX server configuration blocks and location directives client-side with syntax cleanups.

General Developer Utilities Processed in your browser

TCP/UDP Port Lookup Directory & Protocol Guide

Interactive directory of standard networking ports (1-65535) with service names, protocols (TCP/UDP), and security notes.

General Developer Utilities Processed in your browser

URL Parser, Inspector & Query Breakdown

Deconstruct any URL into protocol, origin, hostname, port, pathname, search query parameters table, and hash fragment.

General Developer Utilities Processed in your browser

Cron Next Runs Calculator

Preview the upcoming 10 execution dates and times for any standard cron expression in local and UTC time.

General Developer Utilities Processed in your browser

Unix File Permission Decoder

Decode octal chmod values (0755, 0644) and symbolic strings (rwxr-xr-x) into plain English permissions breakdown.

General Developer Utilities Processed in your browser

CSS Clamp Fluid Typography Calculator

Calculate fluid clamp() formulas for responsive font sizes and spacing across min and max viewport widths.

General Developer Utilities Processed in your browser

SSL Certificate & CSR Decoder

Decode and inspect X.509 SSL/TLS certificates and Certificate Signing Requests (CSR) entirely in your browser with validity timers and SAN details.

General Developer Utilities Processed in your browser

DNS-over-HTTPS (DoH) Lookup

Perform encrypted DNS lookups directly from your browser via Cloudflare, Google, and Quad9 DoH resolvers for A, AAAA, MX, TXT, and CNAME records.

General Developer Utilities Processed in your browser

Crontab Expression Builder & Explainer

Build, edit, and explain standard 5-part cron schedule expressions visually with human-readable English translations and upcoming execution schedules.

General Developer Utilities Processed in your browser

IPv4 CIDR Subnet Calculator

Calculate IPv4 CIDR blocks, subnet masks, wildcard masks, usable host ranges, broadcast addresses, and binary bit breakdowns instantly.