Online Developer Tools
A curated suite of fast, client-side developer utilities, converters, and formatters.
Base64 Converter
Encode and decode Base64 strings with full UTF-8 multibyte and URL-safe variant support.
URL Encoder / Decoder
Encode, decode, and parse query parameters and component structures of URIs and URLs.
Number Base Converter
Simultaneously convert numbers across Decimal, Hexadecimal, Binary, and Octal with BigInt precision.
Ruby Character (Furigana)
Create semantic HTML5 <ruby> pronunciation annotations for Japanese Furigana and Chinese Pinyin.
JSON Formatter & Validator
Validate, pretty-print, and minify JSON data with custom indentation and structural stats.
JSON Query (JSONPath)
Query, filter, and extract nodes from complex JSON documents using JSONPath syntax.
Text Diff Viewer
Inspect additions and deletions between text or code snippets at line, word, or character resolution.
Regex Matcher & Tester
Live interactive regular expression tester with capture group extraction and common pattern presets.
YAML Multiline Strings
Interactive playground comparing Literal (|), Folded (>), and chomping indicators in YAML.
LaTeX Math Formatter
Write and render mathematical formulas and expressions in real time using KaTeX.
JWT Debugger & Verifier
Decode JSON Web Tokens, inspect claims, and verify HMAC-SHA256 signatures in real time.
Unix Timestamp Converter
Live Unix epoch clock and bidirectional timestamp converter across worldwide timezones.
Time Duration Converter
Convert durations across milliseconds, seconds, minutes, hours, days, weeks, and years.
Cron Schedule Parser
Translate 5-part cron expressions into plain English schedules with field breakdowns.
Data Storage Converter
Convert between Decimal (KB, MB, GB, TB) and Binary (KiB, MiB, GiB, TiB) digital storage units.
Network Speed Converter
Convert Mbps to MB/s and estimate theoretical file download times across connection speeds.
Angle Converter
Convert angles across Degrees, Radians, Gradians, and Turns with visual compass dial preview.
UI & Screen Unit Converter
Convert CSS units (px, rem, em, vw, vh) and mobile design units (Android dp, iOS pt).
Color Converter & Contrast
Convert colors across HEX, RGB, HSL, HSV, and CMYK formats with WCAG accessibility contrast check.