Free Online Developer Tools
100% Client-Side Privacy39 browser-based tools - format JSON, compare diffs, test regex, decode JWTs, convert data, and more. Runs locally in your browser.
Data & Format Utilities
9 toolsFormat, convert, validate, and restructure JSON, CSV, YAML, and XML payloads.
JSON Formatter & Validator
Format, validate, beautify, and minify JSON online. Real-time syntax error pointer with line and column highlighting. 100% private.
JSON to CSV Converter
Convert JSON arrays to CSV spreadsheets online. Flattens nested keys, handles missing properties, and provides instant file download.
JSON Compare
Compare two JSON objects side-by-side. Highlights added, removed, and modified keys with deep semantic path tracking.
QR Code Generator
Generate custom QR codes for URLs, Wi-Fi, email, and vCard contacts with high-resolution PNG and vector SVG downloads.
QR Code Scanner
Scan and decode QR codes from image files, clipboard screenshots, or live camera feed. 100% private, client-side processing.
Unix Timestamp Converter
Convert Unix timestamps (seconds & milliseconds) to human dates, UTC, ISO 8601, and local time with live epoch clock.
CSV to JSON Converter
Convert CSV spreadsheets into clean JSON arrays or keyed objects online. Auto-detects delimiters (comma, semicolon, tab) with nested header support.
YAML ⇄ JSON Converter
Convert YAML to JSON and JSON to YAML instantly online. Perfect for Kubernetes manifests, Docker Compose, GitHub Actions, and OpenAPI specs.
XML ⇄ JSON Converter
Convert XML to JSON and JSON to XML online with support for attributes, CDATA tags, nested nodes, and SOAP payloads.
Frontend & CSS Utilities
6 toolsVisual styling tools for gradients, box shadows, color palettes, and SVG/PNG converters.
Color Contrast Checker
Check text and background color contrast ratios for WCAG 2.1 AA and AAA accessibility compliance in real-time.
CSS Gradient Generator
Create beautiful linear, radial, and conic CSS gradients with interactive color stops, angle controls, and ready-to-use CSS snippets.
CSS Box Shadow & Glassmorphism Generator
Design soft shadows, layered elevations, inset effects, and modern frosted-glass glassmorphism with instant CSS code generation.
Color Code Converter & Palette Picker
Convert colors between HEX, RGB, HSL, HSV, and CSS color strings. Preview shades, tints, complementary tones, and WCAG contrast.
SVG to PNG & Vector Exporter
Convert SVG vector code or files into high-resolution PNG, JPEG, or WebP images with customizable scale multipliers (1x, 2x, 4x, 8x).
PNG to SVG Converter
Convert PNG, JPEG, and raster images to scalable SVG vector files online. High-precision vector tracing with color quantization and instant SVG download.
Code & Formatting Utilities
7 toolsCode minification, string case transformations, Markdown preview, and word metrics.
SQL Formatter
Format and beautify SQL queries with custom indentation and keyword casing for MySQL, PostgreSQL, SQLite, and MariaDB.
HTML, CSS & JS Formatter
Beautify and format HTML, CSS, and JavaScript source code in your browser with Prettier formatting rules.
Cron Expression Builder
Build, parse, and validate cron schedules with plain English explanations and upcoming execution timestamps.
UUID Generator
Generate random UUID v4 and time-ordered UUID v7 identifiers with bulk creation controls and RFC 9562 compliance.
HTML, CSS & JS Minifier
Minify HTML, CSS, and JavaScript source code to reduce asset file sizes and eliminate unnecessary whitespace.
String & Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE, Title Case, and sentence case in real time.
Markdown to HTML Converter & Preview
Write and preview GitHub-flavored Markdown in real time. Generates clean, semantic HTML with instant copy and downloadable .html output.
Security & Encoding Utilities
12 toolsCryptographic hash calculators, PBKDF2, HMAC signatures, Base64, and JWT decoding.
JWT Debugger
Decode, verify, and generate JSON Web Tokens in the browser. Check HMAC signatures and inspect claims with 100% privacy.
URL Encoder & Decoder
Encode and decode URLs and query string parameters online with full UTF-8 percent-encoding support.
Text Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes simultaneously in real-time. 100% private, client-side Web Crypto.
File Hash Generator
Compute MD5, SHA-1, SHA-256, and SHA-512 checksums client-side without uploading files. Verify file integrity privately.
HMAC Generator
Generate Keyed-Hash Message Authentication Codes (HMAC-SHA256, HMAC-SHA512, HMAC-SHA1) in Hex and Base64.
Hash Identifier
Identify unknown hash types from length, character set, and format prefixes: MD5, SHA-1, SHA-256, SHA-512, bcrypt, Argon2.
Hash Comparator
Compare two cryptographic hashes side by side to verify file integrity and spot mismatching characters instantly.
Password Hash Generator
Generate salted password hashes with PBKDF2, SHA-256, and SHA-512. 100% private and client-side.
Password Strength Checker
Audit password resilience with Shannon entropy scoring, character diversity checks, and brute-force crack time estimates.
Secure Password Generator
Generate strong, uncrackable random passwords using browser-native CSPRNG randomness with custom length and symbols.
Base64 Encoder & Decoder
Encode and decode text, Base64URL, UTF-8 Unicode, and binary files online. Fast, secure, and client-side.
HTML Entity Encoder & Decoder
Encode special characters into HTML entities (<, >, &, ") or decode entity codes back into raw text to prevent XSS.
Testing & Debugging Utilities
5 toolsRegex testers, QR code tools, cURL converters, cron builders, and diff analyzers.
Regex Tester
Test regular expressions in real time with interactive match highlighting, capturing groups, and flag toggles (g, i, m, s, u).
cURL to Code Converter
Convert cURL commands to JavaScript Fetch, Python Requests, Node.js Axios, Go, PHP, and Rust code snippets instantly.
Text & Code Diff Checker
Compare two text blocks or code files line by line with split side-by-side or unified view and unified patch export.
Mock & Dummy JSON Generator
Generate realistic mock JSON datasets for users, products, e-commerce orders, and blog posts with customizable record counts.
Word & Character Counter
Count words, characters (with & without spaces), sentences, paragraphs, and calculate estimated reading and speaking time in real time.
Showing 39 tools across 5 groups · 100% free · runs client-side