Utilities & Converters
Lightweight converters and utilities: number bases, Roman numerals, CSS units, color formats, timestamps, timers and simple network checks.
Most popular
What Is My IP AddressSee your public IP address (IPv4 or IPv6) instantly. One lightweight request, nothing logged or stored.PX to REM ConverterConvert pixels to rem for accessible, scalable CSS. Custom root font size and a handy reference table.Number Base ConverterConvert integers between binary, octal, decimal, hexadecimal and any base from 2 to 36 — with arbitrary precision.Countdown TimerSimple online countdown timer with presets, pause/resume, alarm sound, tab-title display and notifications.
All utilities & converters (20)
What Is My IP AddressSee your public IP address (IPv4 or IPv6) instantly. One lightweight request, nothing logged or stored.IPv6 Support CheckerTest whether your internet connection supports IPv6 and see which IP version your browser prefers.Password Strength & Entropy CalculatorEstimate password entropy in bits and offline crack time, and get warnings about patterns that make it weak.CSS Unit ConverterConvert between px, rem, em, pt, pc, in, cm, mm, vw, vh and % using your own font size, viewport and container context.PX to REM ConverterConvert pixels to rem for accessible, scalable CSS. Custom root font size and a handy reference table.REM to PX ConverterConvert rem values to pixels for any root font size, with a reference table of common rem sizes.RGB to HEX ConverterConvert RGB values (0–255) to HEX color codes, including uppercase and 3-digit shorthand when possible.HEX to HSL ConverterConvert HEX color codes to HSL values in classic and modern CSS syntax for easy shade adjustments.Binary to Text ConverterDecode binary (8-bit groups) back to readable text using UTF-8, with clear errors for invalid input.Text to Hex ConverterConvert text to hexadecimal UTF-8 bytes with custom separators, uppercase and 0x prefix options.Hex to Text ConverterDecode hexadecimal bytes to readable UTF-8 text. Accepts spaces, colons, commas and 0x prefixes.Octal ConverterConvert octal numbers to decimal, binary and hex — and decode Unix file permissions like 755 into rwx form.Binary CalculatorAdd, subtract, multiply and divide binary numbers, plus AND, OR, XOR and bit shifts, with decimal and hex results.Number Base ConverterConvert integers between binary, octal, decimal, hexadecimal and any base from 2 to 36 — with arbitrary precision.Roman Numeral ConverterConvert numbers (1–3999) to Roman numerals and back, with validation of non-standard numerals.Countdown TimerSimple online countdown timer with presets, pause/resume, alarm sound, tab-title display and notifications.Online StopwatchAccurate online stopwatch with centisecond display, lap times and pause/resume. Works on phone and desktop.Pomodoro TimerFocus with the Pomodoro Technique: 25-minute work sessions, short and long breaks, automatic cycling and alerts.Date to Unix Timestamp ConverterConvert a date and time (local or UTC) into a Unix timestamp in seconds and milliseconds, plus ISO 8601.Timestamp to Date ConverterConvert Unix timestamps (seconds, ms, µs) to human-readable dates in any major time zone, with ISO 8601 output.