All 82+ Free Online Developer Tools
The complete, searchable directory of every tool on Yaykyi. Organized by category — crypto, converters, web dev, networking, math, design, and productivity. All tools run entirely in your browser. No sign-up. No data uploaded.
🔐 Crypto & Security
View category →- →UUID v4 GeneratorRFC 4122 compliant
- →ULID GeneratorSortable unique ID
- →Token GeneratorAPI keys & random tokens
- →Hash GeneratorSHA-256, SHA-512 & more
- →HMAC GeneratorSign messages securely
- →RSA Key Generator1024/2048/4096 bit pairs
- →Password StrengthSecurity score & breakdown
- →Basic AuthHTTP Authorization headers
✏️ String & Text
View category →- →Case Convertercamel, snake, kebab converter
- →Slugify StringURL-friendly slug generator
- →Lorem IpsumPlaceholder text generator
- →Text StatisticsWord count & reading time
- →Text ↔ BinaryASCII binary encoding
- →Text to UnicodeUnicode code points (U+XXXX)
- →NATO AlphabetAlpha, Bravo, Charlie...
- →Text DiffCompare texts side by side
- →String ObfuscatorMask sensitive characters
- →NumeronymizerBuild i18n/k8s like names
- →List ConverterLines to delimited format
- →Markdown EditorLive Markdown previewer
- →Emoji PickerQuick-copy emoji set
- →Invisible CharacterCopy blank unicode spaces
- →Aesthetic FontsConvert text to cool styles
- →Passive Aggressive EmailProfessional corporate speak
🔄 Converters
View category →- →Base64 StringEncode/decode Base64 strings
- →Base64 FileFile ↔ Base64 conversion
- →URL EncoderEncode/decode URL components
- →TemperatureCelsius, Fahrenheit, Kelvin
- →Roman NumeralsArabic ↔ Roman conversion
- →HTML EntitiesEncode or decode entities
- →Base ConverterBinary, octal, decimal, hex
- →ISO Date TimeISO, UTC, Unix timestamps
- →Color ConverterHEX, RGB, HSL conversions
- →JSON → YAMLConvert JSON to YAML
- →YAML → JSONConvert YAML to JSON
- →JSON → CSVJSON array to CSV file
- →XML → JSONParse XML into JSON format
- →JSON → XMLBuild XML from JSON objects
- →CSS Unitspx, rem, em, %, pt
- →Time ZoneWorld time zone calculator
🌐 Web & Development
View category →- →URL ParserDeconstruct URL components
- →JSON FormatterFormat and validate JSON
- →JSON MinifierCompress JSON data
- →JSON DiffCompare two JSON objects
- →XML FormatterPretty-print XML files
- →JWT DecoderInspect JWT headers & claims
- →Regex TesterTest expressions in real-time
- →Chmod CalcUnix permission calculator
- →Random PortSafe port number generation
- →Cron BuilderBuild cron expressions
- →Docker 2 ComposeRun to Compose YAML builder
- →HTTP Status CodesComplete HTTP reference
- →MIME ExplorerExtension → Content-Type
- →KeycodesJavaScript event key codes
- →User AgentBrowser & OS deconstruction
- →Device InfoScreen, viewport, DPR info
- →Email NormalizerStandardize email addresses
- →Safelink DecoderDecode redirect URLs
- →Schema BuilderJSON Sample to Schema
- →SQL FormatterPrettify SQL queries
- →HTML PreviewLive HTML/CSS workspace
- →Shadowban CheckerSocial media visibility scan
🔢 Network
View category →🧮 Math & Measurement
View category →🎨 Images & Design
View category →⚡ Productivity
View category →About Yaykyi Tools
Yaykyi Tools is a free, distraction-free collection of online utilities for developers, designers, and power users. Every tool runs entirely in your browser — no data is sent to any server, no account is required, and there are no ads. Whether you need to generate a UUID, format a JSON response, calculate a subnet mask, decode a JWT, or create a QR code, you will find a fast and precise tool here.
The platform is organized into 8 categories covering cryptography and security, string and text manipulation, data format conversion, web development utilities, network engineering, mathematics, image and design tools, and general productivity. Use the search bar on the home page to find any tool instantly, or browse by category using the links above.
All tools are built with Next.js and run on the edge, ensuring the fastest possible load times globally. The platform is designed to be keyboard-first — use ⌘K to open the command palette and jump to any tool without touching your mouse.