Developer Tools
Handy browser-based utilities I'm building — no install, no sign-up, just paste and go.
JSON Formatter & Validator
Format, validate, and minify JSON data with syntax highlighting and error detection.
Regex Tester
Test regular expressions with live matching, capture groups, and common pattern library.
Base64 Encoder / Decoder
Encode and decode Base64 strings instantly with support for text and file input.
URL Encoder / Decoder
Encode and decode URL components and full URLs with RFC 3986 compliance.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input.
UUID Generator
Generate RFC 4122 v4 (random) and v7 (timestamp-sorted) UUIDs in bulk.
JWT Decoder
Decode JSON Web Tokens to inspect header, payload, and expiration status.
Color Converter
Convert colours between HEX, RGB, and HSL formats with live preview.
Timestamp Converter
Convert between Unix timestamps and ISO 8601 dates with relative time display.
Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences, or words.
Markdown Preview
Write Markdown and see rendered HTML in a live side-by-side preview.
HTML Entity Encoder / Decoder
Encode and decode HTML entities with a built-in reference table.
Diff Checker
Compare two texts side by side with colour-coded additions, removals, and statistics.
String Case Converter
Convert text between camelCase, PascalCase, snake_case, kebab-case, and 6 more formats instantly.
Text Counter
Count characters, words, sentences, paragraphs, lines, and estimate reading and speaking time.
Slug Generator
Generate URL-safe slugs from any text with customizable separator, length, and diacritic transliteration.
Text Sorter
Sort lines alphabetically, numerically, by length, or randomly — with deduplication and blank-line removal.
String Escaper
Escape and unescape strings for JSON, JavaScript, HTML, RegExp, CSV, SQL, and XML formats.
Text Reverser
Reverse entire text, individual word characters, line order, or word order within each line.
Whitespace Cleaner
Trim, normalize, and remove excess whitespace — tabs to spaces, collapse runs, strip blank lines.
Number to Words
Convert numbers to their written-out word equivalents in English and German, cardinal or ordinal.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal with simultaneous multi-base output.
ASCII / Unicode Table
Browse the full ASCII and Unicode character table with code points, HTML entities, and category filters.
Morse Code Translator
Translate text to Morse code and back with optional audio playback.
ROT13 / Caesar Cipher
Encode and decode text with ROT13, ROT47, Caesar shift, and Atbash ciphers.
QR Code Generator
Generate QR codes from any text or URL and download as PNG.
Punycode Encoder / Decoder
Encode international domain names to Punycode (ACE) and decode ACE labels back to Unicode.
URI Parser
Decompose any URI into protocol, host, port, path, query parameters, and fragment.
JSON ↔ YAML Converter
Convert between JSON and YAML formats instantly with syntax validation and pretty-printing.
JSON ↔ CSV Converter
Convert JSON arrays to CSV spreadsheets and parse CSV back to JSON with configurable delimiters.
JSON ↔ XML Converter
Convert JSON objects to XML and XML documents back to JSON with attribute and namespace handling.
CSV Viewer
Paste CSV data and view it as a sortable, filterable table with column detection.
XML Formatter
Prettify or minify XML documents with configurable indentation and syntax validation.
JSONPath Evaluator
Evaluate JSONPath expressions against any JSON document and inspect the matched results.
JSON Schema Validator
Validate JSON data against a JSON Schema (draft-07) and get detailed error messages.
JSON to TypeScript Types
Generate TypeScript interfaces and type definitions from any JSON object or array.
Password Generator
Generate cryptographically-secure passwords with configurable length, character sets, and bulk generation.
Password Strength Checker
Analyse password entropy, crack-time estimates, and character diversity with detailed feedback.
HMAC Generator
Generate HMAC message authentication codes using SHA-256, SHA-384, or SHA-512 with any secret key.
TOTP / 2FA Generator
Generate time-based one-time passwords (TOTP / RFC 6238) for two-factor authentication testing.
CSP Header Builder
Build Content Security Policy headers interactively with directive explanations and copy-ready output.
SSL Certificate Decoder
Decode PEM certificates to inspect subject, issuer, validity dates, and extensions.
Cron Expression Parser
Parse cron expressions, see the next execution times, and generate expressions from natural language.
Regex Pattern Library
Browse a curated library of common regular expression patterns organised by category.
HTTP Status Codes
Browse all HTTP status codes with meaning, RFC reference, and usage guidance.
MIME Type Lookup
Look up MIME types by file extension or search by content-type string.
User-Agent Parser
Parse User-Agent strings to identify browser, OS, device type, and engine.
IP / CIDR Calculator
Calculate subnet masks, network addresses, broadcast addresses, and host ranges from CIDR notation.
chmod Calculator
Calculate Unix file permission octals interactively with read/write/execute toggles for owner, group, and others.
Git Command Reference
Browse and search a curated reference of Git commands with descriptions, flags, and usage examples.
SQL Formatter
Format and prettify SQL queries with configurable indentation and dialect support.
CSS Minifier
Minify CSS stylesheets by removing whitespace, comments, and redundant code.
JavaScript Minifier
Minify JavaScript by removing whitespace and comments for reduced file size.
HTML Formatter
Prettify or minify HTML documents with configurable indentation.
SVG Optimizer
Optimise SVG files by removing metadata, comments, and redundant attributes.
Code Screenshot
Turn code snippets into beautiful screenshots with syntax highlighting and customizable themes.
Fake Data Generator
Generate realistic mock data for testing: names, emails, addresses, and more.
Random Number Generator
Generate cryptographically-secure random numbers, ranges, and sequences.
Color Palette Generator
Generate harmonious color palettes from a base color using complementary, triadic, and analogous schemes.
CSS Gradient Builder
Build and preview CSS linear and radial gradients with a visual editor.
Box Shadow Generator
Create CSS box-shadow declarations visually with live preview.
Border Radius Generator
Craft custom CSS border-radius shapes with an interactive visual editor.
Unit Converter
Convert between length, weight, temperature, area, and digital storage units.
Crypto Unit Converter
Convert between BTC, satoshi, mBTC, wei, gwei, and ether with BigInt precision.
Crypto Address Validator
Validate Bitcoin (Legacy, SegWit, Taproot), Ethereum (EIP-55), and Solana addresses.
BIP39 Mnemonic Tool
Generate and validate BIP39 mnemonic seed phrases (12–24 words) using your browser’s secure RNG.
Merkle Tree Builder
Build and visualise a SHA-256 Merkle hash tree from input leaf values.
EVM Function Selector
Compute Keccak-256 function selectors and event topic hashes from Solidity signatures.
Blockchain Explorer Links
Generate explorer URLs for transactions, addresses, and blocks across all major chains.