All online tools

Set tempo and play in time

Practise tempo with rhythms and count-in

Calculate the frequency of a musical note

Compare frequencies by temperament

Play an A4 reference tone

Generate a pure tone at the frequency of your choice

Generate a progressive sound between two frequencies

Generate white, pink, or brown noise

Estimate BPM by tapping the pulse

Test the left, center, and right channels

Test an in-phase or out-of-phase signal

Quickly test different sound frequencies

Convert a tempo into note durations

Create short sound effects and export them as WAV

Create several random sound effects and export them as WAV files.

Count characters, words and spaces.

Convert case and text formats.

Clean spaces, lines and duplicates.

Generate placeholder text for tests.

Reverse characters, words, lines or paragraphs.

Sort and clean a list of lines.

Remove duplicate lines from a list.

Compare two lists line by line.

Replace an expression in a text.

Keep or remove lines based on a rule.

Create a clean word list from text or a .txt file.

Divide long text into readable blocks.

Add a prefix, suffix, numbering or template to each line.

Roll a classic 6-sided die and get an instant result.

Roll a virtual die with the number of sides you choose.

Roll 2 to 12 six-sided dice at once.

Draw one or more random results from a custom list.

Generate an integer between two bounds.

Flip a virtual coin and get heads or tails in seconds.

Create a colorful wheel and spin it to choose an option.

Get a random yes or no answer with a simple decision card.

Shuffle a list into a new order.

Split a participant list into balanced random teams.

Create a random turn order.

Draw one or more random cards from a standard deck.

Draw several unique numbers within a defined range.

Play a round of rock paper scissors against chance.

Draw a word or expression at random.

Draw randomly with custom probabilities.

Roll a d2 in one click.

Roll a d3 in one click.

Roll a d4 in one click.

Roll a d5 in one click.

Roll a d6 in one click.

Roll a d8 in one click.

Roll a d10 in one click.

Roll a d12 in one click.

Roll a d16 in one click.

Roll a d20 in one click.

Roll a d24 in one click.

Roll a d30 in one click.

Roll a d100 in one click.

Remove petals from a virtual daisy and reveal the final answer.

Start a countdown with presets, progress and a visual alert.

Set a visual alarm for a specific time.

Measure elapsed time with start, pause, resume and laps.

Quickly set a duration and start a visual timer.

Add durations and get the total automatically.

Convert seconds, minutes, hours and durations with days.

Calculate the duration between two times in HH:MM:SS format.

Calculate an end time from a start time and a duration.

Calculate a start time from an end time and a duration.

Divide a duration into equal parts.

Multiply a duration by a number of repetitions.

A visual hourglass for quick countdowns.

Play tic-tac-toe with two players in your browser.

Play Connect Four directly in your browser.

Find matching pairs of cards.

Control the snake and try to beat your score.

Reveal cells without hitting a mine.

Merge tiles to reach 2048.

Memorize and repeat the sequence.

Guess the secret color combination.

Guess the word before you run out of tries.

Put the tiles back in order.

Play a sudoku grid directly in your browser.

Answer a series of true or false questions.

Convert meters, kilometers, feet, miles and other length units.

Convert grams, kilograms, pounds, ounces and tons.

Convert Celsius, Fahrenheit, Kelvin and Rankine.

Convert liters, milliliters, gallons, pints and cubic meters.

Convert square meters, hectares, acres and square feet.

Convert km/h, m/s, mph, knots and ft/s.

Compare pied du roi, perches, cubits and other historical measures.

Convert joules, Wh, kWh, calories, BTU and thermies.

Convert watts, kilowatts, horsepower, BTU/h and kcal/h.

Convert pascals, bars, hPa, psi, atm and mmHg.

Convert degrees, radians, gradians, turns, arcminutes and arcseconds.

Convert N·m, lbf·ft, lbf·in, kgf·m and kgf·cm.

Convert m³/s, m³/h, litres per minute, US gallons and cubic feet per minute.

Convert kg/m³, g/cm³, g/mL, lb/ft³ and lb/gal.

Convert length, mass, temperature, volume, area and speed.

Convert newtons, kilogram-force, pound-force and other force units.

Convert hertz, kilohertz, megahertz, rpm and bpm.

Convert bits, bytes, kB, MB, GB, TB and binary units.

Convert bit/s, Mbit/s, Gbit/s, B/s, MB/s and GB/s.

Convert teslas, milliteslas, microteslas, gauss and milligauss.

Convert Pa·s, mPa·s, poise, centipoise and lb/(ft·s).

Convert m²/s, mm²/s, stokes and centistokes.

Convert m/s², km/h/s, ft/s², g and Gal.

Convert L/100 km, km/L, US mpg and UK mpg.

Convert C, mC, µC, Ah and mAh.

Convert lx, klx, mlx, fc, ph and nox.

Convert cd/m², nit and foot-lambert.

Convert V/m, kV/m, mV/m and N/C.

Convert N/m, mN/m and dyn/cm.

Convert J/(kg·K), cal/(g·°C) and BTU/(lb·°F).

Convert voltage, current, resistance, capacitance and inductance.

Convert kg/s, kg/h, g/min, t/h, lb/s and lb/h.

Convert sr, msr, µsr, deg², arcmin² and arcsec².

Encode or decode a message with an exact alphabet shift.

Automatically test the 25 possible Caesar shifts.

Encode or decode text with the fixed 13-letter alphabet shift.

Encode or decode digits with a rotation of 5.

Apply ROT13 to letters and ROT5 to digits.

Encode or decode printable ASCII characters with ROT47.

Try ROT5, ROT13, ROT18 and ROT47 in one tool.

Encode or decode a message with a Vigenère key.

Encode or decode text with the reversed alphabet.

Encode or decode Morse with dots, dashes, or detected symbols.

Convert letters and numbers with A1Z26, A0Z25, and two reversed variants.

Encode a message with a 5×5 grid and coordinates.

Encode text using a zigzag pattern.

Encode text by transposition with a chosen width.

Count each letter occurrence and percentage in a text.

Convert a number to Roman numerals, or the other way around.

Convert text to decimal or hexadecimal ASCII, and back again.

Convert text to sequences of 0s and 1s, and back again.

Convert text to UTF-8 hexadecimal, or read a sequence of bytes.

Convert text into Alfa, Bravo, Charlie radio words.

Turn a message into taps or dots.

Encode or decode a message with five-character A/B groups.

Convert text to Unicode braille, or read braille back into text.

Prepare text before decoding by adjusting case, accents, spaces, and kept characters.

Create a substitution alphabet to encode or decode a message.

Shuffle the letters of a word or phrase in seconds.

Encode a message in a reading grid.

Convert a GPS coordinate between decimal, DM and DMS.

Build a substitution alphabet with letter tiles.

Analyze letter frequencies and test a substitution table letter by letter.

Shuffle the words of each sentence in seconds.

Reverse words, lines, or their order instantly.

Convert a message to grid coordinates, or coordinates back to a message.

Extract letters by step or positions.

Test several simple decodings on the same message.

Transpose text with an oriented grid.

Place text into a spiral grid.

Reveal a hidden message in the lines or words of a text.

Generate a simple grid with hidden words.

Create an encoded message with its explained solution.

Extract hidden letters by positions, patterns, masks, or common attempts.

Extract, remove, replace, or count character families.

Extract all numbers found in text.

Calculate the value of a word or text with A=0 and A=1 mappings.

Calculate gaps between alphabet letters.

Create a blank square-cell grid and print it on A4.

Place text into a square-cell grid and print it on A4.

Test a repeated alphabet shift with A=0, A=1, or a number sequence.

Automatically read the diagonals of text placed in a grid.

Detect GPS coordinates found in text.

Retrieve a specific letter from each word.

Analyze an unknown message and spot possible codes.

Compare two texts and instantly spot matching or different passages.

Extract a hidden message from the differences between two texts.

Turn source text into a grid and test several reading paths.

Try several grid widths to reveal hidden readings.

Extract letters using a sequence of positions.

Find the letters absent from a text.

Count repeated, unique, and absent letters.

Quickly test a substitution alphabet on a text.

Analyze, normalize and share a GPS coordinate.

Find the exact positions of each letter in a text.

Calculate an exact age in years, months and days.

Add or subtract days from a date.

Simply calculate the number of days between two dates.

Calculate business days between two dates.

Calculate the number of weeks between two dates.

Prepare a printable calendar over several months.

Find the rank of a date within the year.

List all ISO weeks in a year.

Find the ISO week number for a date.

Find the weekday for any date.

Calculate the number of months between two dates.

Count the days remaining or elapsed from a target date.

Check a year or list leap years within an interval.

Display and print a clear monthly calendar.

Calculate the number of quarters between two dates.

Check the contrast between two colors.

Create a clear and compact robots.txt.

Analyze an Apache access.log in your browser.

Generate a strong local password

Calculate SHA-256, SHA-384 and SHA-512 hashes.

Calculate classic fingerprints for legacy uses.

Create a workout with effort, rest, rounds and preparation.

Start a short, classic or longer Tabata workout.

Calculate your running pace.