UUID Generator
Generate cryptographically secure UUID v4 values.
Open tool →Developer Tools
Free browser-based utilities for developers and data work.
Security & generators
Hashes, identifiers, tokens and authentication helpers.
Hash Generator
Create SHA hashes with the Web Crypto API.
Open tool →Password Generator
Generate secure random passwords locally.
Open tool →JWT Decoder
Inspect JWT headers and payloads without verifying signatures.
Open tool →Token Generator
Generate secure random tokens locally.
Open tool →ULID Generator
Generate lexicographically sortable unique identifiers.
Open tool →HMAC Generator
Create HMAC signatures using SHA algorithms.
Open tool →TOTP Generator
Generate a time-based one-time password from a Base32 secret.
Open tool →RSA Key Pair Generator
Generate an RSA-2048 public/private PEM key pair locally.
Open tool →Password Strength Analyser
Estimate password strength and identify common weaknesses locally.
Open tool →AES-GCM Encryption
Encrypt or decrypt text with a password locally using AES-256-GCM.
Open tool →Secure Random Number Generator
Generate unbiased secure random integers for a chosen range.
Open tool →Converters & data
Transform structured data, numbers, dates and units.
JSON Formatter
Format and minify JSON locally in your browser.
Open tool →JSON Validator
Validate JSON and find syntax errors locally.
Open tool →Base64 Encoder
Encode Unicode text as Base64 locally.
Open tool →Base64 Decoder
Decode Base64 into readable Unicode text locally.
Open tool →URL Encoder
Encode URL components locally in your browser.
Open tool →URL Decoder
Decode URL-encoded text locally in your browser.
Open tool →Case Converter
Convert text between common naming conventions.
Open tool →Timestamp Converter
Convert Unix timestamps to ISO dates locally.
Open tool →Number Base Converter
Convert integers between binary, octal, decimal and hexadecimal.
Open tool →Color Converter
Convert colors between HEX, RGB and HSL.
Open tool →JSON/YAML Converter
Convert data between JSON and YAML locally.
Open tool →XML/JSON Converter
Convert XML and JSON data locally.
Open tool →CSV/JSON Converter
Convert tabular CSV data to and from JSON.
Open tool →YAML Formatter
Validate and format YAML locally.
Open tool →XML Formatter
Validate and format XML locally.
Open tool →JSON Minifier
Remove unnecessary whitespace from JSON.
Open tool →Chmod Calculator
Convert numeric Unix permissions to symbolic form.
Open tool →Temperature Converter
Convert Celsius, Fahrenheit and Kelvin.
Open tool →Percentage Calculator
Calculate percentages and relative change.
Open tool →Roman Numeral Converter
Convert between integers and Roman numerals.
Open tool →Date Converter
Show a date in ISO, local and Unix formats.
Open tool →JSON Diff
Compare two JSON documents by property path.
Open tool →REM/PX Converter
Convert CSS units using a configurable root size.
Open tool →Data Size Converter
Convert bytes to common decimal and binary units.
Open tool →Angle Converter
Convert degrees to radians, gradians and turns.
Open tool →Duration Converter
Convert seconds into common duration units.
Open tool →JSON to TOML Converter
Convert JSON objects to readable TOML locally.
Open tool →YAML to TOML Converter
Convert YAML objects to readable TOML locally.
Open tool →ETA Calculator
Estimate completion time from progress and elapsed time.
Open tool →Energy Converter
Convert joules, watt-hours and kilowatt-hours.
Open tool →Power Converter
Convert watts, kilowatts and horsepower.
Open tool →Length Converter
Convert metric and imperial length units.
Open tool →Markdown to HTML Converter
Convert common Markdown syntax to clean HTML locally.
Open tool →SQL Formatter
Format common SQL statements into a readable layout.
Open tool →JSON Flattener
Flatten nested JSON into path-based key/value pairs locally.
Open tool →JSON Key Sorter
Recursively sort object keys in JSON without changing array order.
Open tool →JSON Path Query
Read a value from JSON using a simple dot or bracket path.
Open tool →HTML to Text Converter
Extract readable plain text from HTML locally.
Open tool →Text and ASCII Code Converter
Convert text to Unicode decimal code points and back.
Open tool →TOML to JSON Converter
Convert common TOML configuration data to formatted JSON locally.
Open tool →TOML to YAML Converter
Convert common TOML configuration data to readable YAML locally.
Open tool →Math Expression Evaluator
Safely evaluate arithmetic expressions and common math functions locally.
Open tool →Base64 File Converter
Encode files as Base64 or decode Base64 into a downloadable file locally.
Open tool →Web & network
Utilities for URLs, browsers, network data and web development.
HTML Encoder
Escape HTML special characters locally.
Open tool →HTML Decoder
Decode escaped HTML entities locally.
Open tool →Regular Expression Tester
Test JavaScript regular expressions against text locally.
Open tool →Cron Expression Helper
Explain standard five-field cron expressions.
Open tool →QR Code Generator
Generate downloadable QR codes locally.
Open tool →Basic Auth Generator
Create HTTP Basic Authorization headers.
Open tool →Random Port Generator
Generate a random unprivileged TCP/UDP port.
Open tool →URL Parser
Inspect the individual parts of a URL.
Open tool →IPv4 Address Converter
Convert IPv4 addresses to decimal, hexadecimal and binary.
Open tool →MAC Address Generator
Generate locally administered MAC addresses.
Open tool →Device Information
Inspect browser, screen and platform information.
Open tool →CSS Formatter
Format compact CSS into a readable layout.
Open tool →Outlook Safe Link Decoder
Extract the original URL from Microsoft Safe Links.
Open tool →IPv4 Subnet Calculator
Calculate network, broadcast and host ranges from IPv4 CIDR.
Open tool →URL Defanger
Defang or restore URLs for safe sharing in security reports.
Open tool →Query String Converter
Convert between URL query strings and JSON objects.
Open tool →CSS Minifier
Remove comments and unnecessary whitespace from CSS.
Open tool →HTML Minifier
Compact HTML markup locally without uploading it.
Open tool →User-Agent Parser
Identify common browsers, engines and operating systems.
Open tool →HTTP Status Code Reference
Look up common HTTP response codes and meanings.
Open tool →Color Contrast Checker
Calculate WCAG contrast ratios for two HEX colors.
Open tool →IBAN Validator
Normalize and validate IBAN checksums locally.
Open tool →IPv6 ULA Generator
Generate a random RFC 4193 local IPv6 prefix.
Open tool →Open Graph Meta Generator
Generate Open Graph and Twitter HTML meta tags.
Open tool →SVG Placeholder Generator
Generate lightweight SVG image placeholders.
Open tool →MIME Type Lookup
Look up common MIME types by file extension or value.
Open tool →Docker Run to Compose
Convert common docker run options into a Compose service.
Open tool →IPv4 Range Expander
Expand a bounded IPv4 start/end range into addresses.
Open tool →Wi-Fi QR Code Generator
Generate a Wi-Fi connection QR code locally from network details.
Open tool →Git Command Reference
Search a concise reference of common Git commands.
Open tool →Regular Expression Cheat Sheet
Search a concise JavaScript regular expression reference.
Open tool →Character and Keycode Information
Inspect Unicode, UTF-16 and UTF-8 values for a character.
Open tool →Command Benchmark Builder
Build a reproducible hyperfine command from commands and run settings.
Open tool →Online Chronometer
Measure elapsed time accurately with a browser-based stopwatch.
Open tool →HTML WYSIWYG Editor
Edit formatted content visually and copy the generated HTML.
Open tool →Local PDF Signature Inspector
Inspect a PDF locally for embedded digital-signature structures.
Open tool →Text utilities
Analyze, compare, normalize and generate text.
Text Counter
Count characters, words and lines locally.
Open tool →Text Diff
Compare two texts line by line locally.
Open tool →Slug Generator
Turn text into clean URL-safe slugs.
Open tool →Numeronym Generator
Abbreviate words such as internationalization to i18n.
Open tool →Text/Binary Converter
Convert UTF-8 text to binary bytes and back.
Open tool →Text/Unicode Converter
Convert text to Unicode code points and back.
Open tool →String Obfuscator
Mask sensitive strings before sharing them.
Open tool →Lorem Ipsum Generator
Generate placeholder paragraphs locally.
Open tool →Email Normalizer
Normalize, deduplicate and sort email address lists.
Open tool →List Converter
Trim, deduplicate, sort and reverse line-based lists.
Open tool →NATO Phonetic Alphabet
Convert text into words for clear voice transmission.
Open tool →Morse Code Converter
Convert text to International Morse code and back.
Open tool →Word Frequency Counter
Count and rank repeated words in text locally.
Open tool →Phone Number Formatter
Normalize international phone numbers for storage and display.
Open tool →Line Sorter
Sort text lines naturally while keeping processing local.
Open tool →Duplicate Line Remover
Remove repeated lines while preserving their first occurrence.
Open tool →Emoji Picker
Search common emoji by name or keyword without loading external data.
Open tool →ASCII Text Drawer
Turn letters and numbers into a compact five-row ASCII banner.
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