Developer tools
Fast, client-side developer utilities: formatters, encoders, converters, and quick reference. No build, no backend.
Converter
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px to rem converter
Convert px to rem and em (and back) in your browser, with separate root and parent font sizes and a live px-to-rem reference table. Nothing leaves your machine.
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px to pt converter
Convert between the absolute CSS units - px, pt, pc, inches, cm, and mm - in your browser. Type any value and the rest update instantly. Nothing leaves your machine.
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Color converter
Convert colors between HEX, RGB, and HSL (with alpha) in your browser, with a live swatch. Type any format and the others update instantly. Nothing leaves your machine.
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Data size converter
Convert data sizes between bytes, KB, MB, GB, TB, and PB in your browser, with a decimal (1000) or binary (1024) base. Type any value and the rest update instantly. Nothing leaves your machine.
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Number base converter
Convert numbers between binary, octal, decimal, and hexadecimal in your browser. Type in any base and the others update instantly. Nothing leaves your machine.
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Angle converter
Convert angles between degrees, radians, gradians, and turns in your browser. Type any value and the rest update instantly. Nothing leaves your machine.
Text
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URL encoder
Encode or decode URLs and query parameters in your browser - switch between component and full-URL escaping. Nothing leaves your machine.
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Slugify
Turn any text into a clean URL slug in your browser - lowercase, accents stripped, spaces and punctuation collapsed to hyphens. Nothing leaves your machine.
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Password generator
Generate strong random passwords or memorable passphrases in your browser, using the secure Web Crypto RNG. Nothing leaves your machine.
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Case converter
Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, and more in your browser. Nothing leaves your machine.
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Word counter
Count words, characters, sentences, lines, and paragraphs as you type, with reading time, in your browser. Nothing leaves your machine.
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HTML entity encoder
Encode or decode HTML entities in your browser - escape special characters or named and numeric entities, and decode them back. Nothing leaves your machine.
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Unicode explorer
Inspect Unicode characters and convert text to and from \u escape sequences in your browser, with a per-character breakdown. Nothing leaves your machine.
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Base64 encoder / decoder
Encode or decode Base64 in your browser - text (UTF-8 safe) with a standard or URL-safe variant, plus turn any file into a data URI. Nothing leaves your machine.
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Line tools
Sort, dedupe, reverse, shuffle, trim, and clean lines of text in your browser, with live line and unique counts. Nothing leaves your machine.
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Text diff
Compare two texts in your browser and see exactly what changed, line by line, with word-level highlighting and a side-by-side or unified view. Nothing leaves your machine.
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Regex tester
Test regular expressions in your browser with live match highlighting, capture groups, every JavaScript flag, a replace preview, and a built-in cheatsheet. Nothing leaves your machine.
Time
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Unix timestamp converter
Convert Unix timestamps to human-readable dates and back in your browser - auto-detects seconds or milliseconds, shows local and UTC time, and gives a live current timestamp. Nothing leaves your machine.
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Time zone converter
Compare times across time zones in your browser with a visual meeting planner - stacked 24-hour strips aligned to one timeline so overlapping working hours are obvious. Nothing leaves your machine.
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Time standards converter
See one instant across every time standard in your browser - UTC, local, Unix, TAI, GPS time, TT, Julian Date, MJD, day of year, ISO week, and GMST - with a bundled leap-second table. Nothing leaves your machine.