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💻 Developer Tools

Online utilities for developers, programmers, and DevOps engineers — JSON, Base64, JWT, Regex, and code formatters.

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JSON Formatter & Validator
Free online JSON formatter, validator, and minifier. Beautify messy JSON data, validate syntax, and spot errors with line markers in real-time.
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Base64 Encoder
Fast and secure online Base64 encoder. Convert text, strings, and UTF-8 characters to standard and URL-safe Base64 instantly in your browser.
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Base64 Decoder
Decode Base64 strings to readable UTF-8 plain text online. Handles standard, padded, and URL-safe Base64 format with automatic padding repair.
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Base64 Encoder & Decoder
Convert text to Base64 and decode Base64 back into readable UTF-8 text in one unified workspace with URL-safe options.
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URL Encoder & Decoder
Encode and decode URLs and URI query parameters with standard percent-encoding in your browser.
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JWT Decoder & Inspector
Decode and inspect JSON Web Tokens (JWT) safely in your browser. View header algorithms, payload claims, and expiration timestamps.
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UUID / GUID Generator
Generate cryptographically secure Version-4 UUIDs and GUIDs individually or in bulk. Customize hyphens, uppercase, and braces.
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Hash Generator (MD5, SHA-256, SHA-512)
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 cryptographic checksum hashes in real-time in your browser with Web Crypto API.
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HTML Entity Encoder & Decoder
Encode special characters into HTML numeric entities and decode HTML entities back into characters.
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Unix Timestamp Converter
Convert Unix epoch timestamps (seconds and milliseconds) to human-readable UTC, ISO 8601, and local date times.
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Cron Expression Generator & Explainer
Parse crontab expressions into plain English explanations and schedule timings with field-by-field breakdown.
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Chmod Permissions Calculator
Interactive Linux file permissions calculator. Convert between Octal (755, 644, 777), Symbolic (rwxr-xr-x), and checkbox permissions.
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HTML Formatter & Beautifier
Format, beautify, and indent HTML markup online. Fix messy web page code with customizable 2-space or 4-space indentation.
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HTML Minifier & Compressor
Minify HTML code by stripping comments, extra whitespace, and line breaks to optimize web page load times and SEO performance.
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CSS Formatter & Beautifier
Format, indent, and beautify CSS stylesheets online. Standardize CSS rule formatting and spacing instantly in your browser.
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CSS Minifier & Optimizer
Compress CSS stylesheets by removing whitespace, comments, and redundant semicolons to boost page speed.
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JavaScript Formatter & Beautifier
Format, indent, and beautify JavaScript code online. Convert minified or messy JS scripts into clean, readable code.
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JavaScript Minifier
Minify JavaScript scripts by stripping comments, extra line breaks, and unnecessary whitespace in your browser.
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JSON Minifier & Compact Tool
Compress and minify JSON data into a single line to optimize API payloads, database storage, and network transmissions.
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SQL Query Formatter & Beautifier
Format, indent, and uppercase SQL queries (MySQL, PostgreSQL, SQLite, MS SQL) for maximum database readability.
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HTML to JSX / React Converter
Convert raw HTML code into React JSX syntax. Auto-converts class to className, for to htmlFor, inline styles to objects, and self-closes tags.
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CSS to JS / React Style Converter
Convert kebab-case CSS declarations into camelCase JavaScript style objects ready for React, React Native, and styled-components.
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cURL Command to Code Converter
Convert cURL terminal commands into modern JavaScript Fetch API, Axios requests, or Python requests code in seconds.
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JSON Diff & Comparison Tool
Compare two JSON objects or files side-by-side to find added, deleted, and modified keys and values in real-time.
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Regex Tester & Regular Expression Debugger
Test and debug JavaScript regular expressions in real-time with instant match highlighting, capture group extraction, and flag controls.
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Markdown Previewer & Live Split Editor
Live split-screen Markdown editor with real-time HTML preview, table formatting, code syntax highlighting, and HTML/MD export.
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JavaScript Keycode & Event Inspector
Press any key on your keyboard to instantly inspect event.key, event.code, event.which, and modifier keys (Ctrl, Alt, Shift, Meta).
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SemVer Comparator & Range Tester
Compare semantic version numbers (Major.Minor.Patch-Prerelease) according to the SemVer 2.0.0 specification.
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.env to JSON & Docker Compose Converter
Convert .env environment configuration files into JSON key-value objects and Docker Compose environment YAML syntax.
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URL Query Parameter Parser & Builder
Parse URLs into protocol, hostname, path, hash, and query parameters. Edit, add, and reconstruct query strings in seconds.
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Subdomain & Hostname Extractor
Extract unique hostnames, subdomains, and root domains from lists of URLs, log files, and raw text.
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Credit Card Luhn Algorithm Validator
Validate credit card, debit card, and IMEI numbers using the MOD 10 Luhn checksum algorithm. 100% private in-browser validation with zero data storage.
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CIDR & Subnet Range Calculator
Calculate IPv4 CIDR blocks, subnet masks, usable host ranges, network addresses, and broadcast addresses instantly.
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IP to Integer & Hex Converter
Convert IPv4 dotted-decimal addresses into 32-bit unsigned integers, hexadecimal, and binary formats for database optimization.
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IPv6 Address Expander & Compressor
Expand compressed IPv6 addresses into full 32-digit 8-hextet format, or compress long IPv6 addresses using standard RFC 5952 zero-suppression.
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SPF Record Generator
Interactive SPF record creation wizard. Build secure v=spf1 DNS TXT records with MX, IPv4/IPv6, and third-party email provider includes.
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DMARC Policy Generator
Generate compliant _dmarc DNS TXT records to protect your domain from email spoofing and phishing with aggregate reporting (RUA) tags.
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Robots.txt Generator
Create a search-engine friendly robots.txt file for Googlebot, Bingbot, and web crawlers with custom disallow rules and XML sitemap link.
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XML Sitemap Generator
Generate clean XML sitemap files for Google Search Console and Bing Webmaster Tools from a list of URLs with lastmod timestamps.
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Meta Tag & Open Graph Generator
Generate complete HTML SEO meta tags, Open Graph (OG) Facebook tags, and Twitter Cards with live snippet preview.
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XML Validator & Syntax Checker
Validate XML syntax and check for well-formedness online in your browser. Highlights exact line and column errors with zero server file uploads.
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HTTP Request & REST API Mock Tester
Lightweight in-browser REST API tester. Send GET, POST, PUT, PATCH, DELETE requests with custom headers and JSON body to test APIs in real-time.
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Git Command Generator & Interactive Helper
Generate Git commands visually for branching, merging, stashing, rebasing, committing, and undoing mistakes with one-click copy.
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MAC Address Formatter & Standardizer
Format and convert MAC addresses between Colon (00:1A:2B:3C:4D:5E), Hyphen (00-1A-2B-3C-4D-5E), Dot (001a.2b3c.4d5e Cisco), and raw hexadecimal.
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HTTP Status Code Reference & Lookup
Complete HTTP response status codes guide (100 to 599). Instant search and lookup with RFC definitions, common causes, and troubleshooting steps.
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MIME Type & File Extension Reference Guide
Search and lookup standard Content-Type MIME types and corresponding file extensions for web development, HTTP headers, and API responses.
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AES-GCM 256-bit Text & File Encryptor / Decryptor
Encrypt and decrypt text and data with AES-256-GCM using Web Crypto API. Password protected with PBKDF2 key derivation and zero server uploads.
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RSA Key Pair Generator (2048 & 4096-bit PEM)
Generate cryptographically secure RSA public and private key pairs (2048-bit, 4096-bit) in PEM format directly in your browser with zero server uploads.
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Large File Checksum & Hash Calculator
Calculate SHA-256, SHA-512, SHA-1, and MD5 checksums for large files in your browser. Stream-processed locally with zero server file uploads.
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HMAC Signature Generator (SHA-256, SHA-512, SHA-1)
Generate HMAC (Hash-based Message Authentication Code) signatures online using SHA-256, SHA-512, and SHA-1 with custom secret keys.
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Password Strength & Crack-Time Estimator
Test password strength and crack resistance. Analyzes entropy, brute-force crack time across GPU clusters, dictionary patterns, and security tips.
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Public Key / X.509 Certificate Decoder & Inspector
Decode and inspect X.509 SSL/TLS certificates and CSR files in PEM format. View Issuer, Subject, Validity dates, SANs, and Public Key algorithms.
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Bcrypt Hash Generator & Verifier
Generate and verify Bcrypt password hashes online. Customizable work factor (salt rounds 4-16) with instant hash comparison.
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PBKDF2 Key Derivation Generator
Derive cryptographic keys from passwords using PBKDF2 (Password-Based Key Derivation Function 2) with HMAC-SHA256/SHA-512 via Web Crypto API.
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Random Secret & API Key / Token Generator
Generate cryptographically random API keys, secret tokens, JWT secret keys, and webhook signing secrets in Hex, Base64, and alphanumeric formats.
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DKIM Record Generator & RSA Keypair Builder
Generate DKIM (DomainKeys Identified Mail) RSA 2048-bit keypairs and format DNS TXT records for your domain in your browser with zero server uploads.
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Schema.org JSON-LD Validator & Rich Snippet Checker
Validate Schema.org JSON-LD structured data and check rich snippet compliance for Article, Product, Organization, FAQ, and Breadcrumb markup.
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