Explained simply
What Is Morse Code?
Morse code is a way of writing letters and numbers as short and long signals, dots and dashes, so a message can travel as clicks, beeps, flashes of light or taps. Here is what it is, how it works and what it looks and sounds like.
Morse code definition
Morse code is a character-encoding system that represents each letter, digit and punctuation mark as a unique sequence of short signals (dots, or "dits") and long signals (dashes, or "dahs"). The sequences are separated by silence of a fixed length. Because the signals are only "on" and "off", Morse code can be sent with almost anything: a telegraph key, a radio tone, a flashlight, a car horn, a knock on a wall or the blink of an eye.
The system was developed in the 1830s and 1840s by Samuel F. B. Morse and Alfred Vail for the electric telegraph. The version used worldwide today is called International Morse Code, standardized by the International Telecommunication Union (ITU-R Recommendation M.1677). It is not a language. It is a way of spelling an existing language, letter by letter, in a form that survives noise, distance and very simple equipment.
How does Morse code work?
Everything in Morse code is built from one unit of time: the length of a dot. A dash is three dots long. Silence is just as important as sound, because the gaps are what tell you where one letter ends and the next begins. There are five timing rules, and once you know them you know the whole system:
- A dot lasts 1 unit.
- A dash lasts 3 units.
- The gap between dots and dashes inside one letter is 1 unit.
- The gap between letters is 3 units.
- The gap between words is 7 units.
Here is the letter E (one dot) next to the letter T (one dash). The teal bars are signal; the empty space is silence:
And here is the word HI followed by ME. Notice the short gaps inside H (····), the longer gap between H and I, and the much longer gap between the two words:
Speed is measured in words per minute (WPM) using the standard word PARIS, which is exactly 50 units long. At 10 WPM a dot lasts 120 milliseconds; at 20 WPM it lasts 60 milliseconds. Our audio translator lets you hear any speed you like.
The key insight Morse code is heard as rhythm, not read as symbols. Experienced operators do not count dots; they recognize that "di-dah" is A the same way you recognize a word without spelling it.
The Morse code alphabet in brief
The most common letters in English got the shortest codes, which is why E is a single dot and T a single dash. Rare letters such as Q, Y and J use four symbols. The twelve letters below cover roughly three quarters of ordinary English text. Tap any tile to hear it, or open the full Morse code alphabet.
Examples
What Morse code looks like: real examples
Each letter is written with its dots and dashes; a slash separates words. Press play to hear the rhythm at a comfortable 15 words per minute.
| Message | Morse code | Listen |
|---|---|---|
| SOS | ... --- ... | |
| HELP | .... . .-.. .--. | |
| HELLO | .... . .-.. .-.. --- | |
| I LOVE YOU | .. / .-.. --- ...- . / -.-- --- ..- | |
| YES | -.-- . ... | |
| NO | -. --- |
Four channels
How Morse code is transmitted
The code never changes; only the medium does. A dash is simply "on" for three times as long as a dot, whatever "on" happens to be.
Sound
A telegraph sounder's clicks or a radio tone (usually 500–800 Hz). This is how most Morse is used today, and how it should be learned. Generate Morse audio.
Light
Flashlights, signal lamps on ships, even eye blinks. Light Morse is sent slowly so the eye can follow. Morse code with light.
Radio
Known as CW (continuous wave). A simple transmitter keyed on and off punches through static that would drown out speech. Still popular with amateur radio operators worldwide.
Taps and touch
Knocks on a wall, taps on a phone screen or vibrations. Morse code tapping explains the conventions.
A short history
Where Morse code came from
Samuel Morse, a painter by profession, began working on an electric telegraph in 1832 and gave his first demonstrations in 1837. His collaborator Alfred Vail refined the code of dots and dashes and built much of the hardware. On 24 May 1844, Morse sent the first public message over a line from Washington, D.C. to Baltimore: "What hath God wrought."
The original "American Morse" was later reworked in Europe, and in 1865 the International Telegraph Union adopted the version we still use. Radio carried it across oceans in the early 1900s, and SOS became the universal distress signal in 1908. Read the full history of Morse code, from the telegraph to the Titanic and beyond.
Today
Is Morse code still used?
Yes, more than most people expect. Amateur radio operators send millions of Morse contacts every year. Aviation radio beacons (VOR and NDB) identify themselves in Morse so pilots can confirm they are tuned to the right station. The US Navy still trains signalmen to send Morse by flashing light. And since 2018, Google's Gboard keyboard has included a Morse layout for people who type with switches.
What ended was commercial use: ships stopped keeping a Morse radio watch in 1999 and the last telegram companies closed in the 2000s. See where Morse code is still used for the full picture.
Why learn Morse code?
Nobody needs Morse code to get through the day, which is exactly why learning it feels so satisfying. Here are the reasons people give us most often:
- It is a genuinely useful emergency skill. SOS by flashlight, horn or tapping works when nothing else does, and anyone within sight or earshot who knows the pattern will understand it.
- It opens up amateur radio. Morse (CW) contacts reach farther with less power than voice, and the CW community is one of the friendliest corners of the hobby.
- It is a brain workout. Learning to decode rhythm in real time is a new skill for your ears and memory, similar to learning an instrument.
- It is fun to share. Secret notes, bracelets that spell a name, a blinking lamp in a window. Morse code is the original secret code, and kids love it.
Most people recognize all 26 letters by ear after a few weeks of ten-minute sessions. Our guide to learning Morse code explains the method that works, and the practice quiz trains your ear for free.
Six Morse code facts worth knowing
- SOS does not stand for anything. "Save Our Souls" and "Save Our Ship" were invented afterwards. The signal was chosen in 1906 because nine evenly spaced symbols are easy to send and impossible to mistake.
- The shortest code goes to the most common letter. Morse and Vail reportedly counted the type in a printer's case to find letter frequencies, an early form of data compression.
- The Titanic sent both CQD and SOS. In April 1912 its operators used the older British distress call first, then the new SOS.
- A US Navy pilot blinked a message on TV. In 1966, prisoner of war Jeremiah Denton blinked T-O-R-T-U-R-E in Morse during a staged interview in North Vietnam.
- Morse Code Day is April 27, Samuel Morse's birthday (he was born in 1791).
- The US dropped the Morse test for amateur radio licenses in 2007, and yet CW activity on the bands has grown since, because people now learn it by choice.
FAQ
Frequently asked questions
What is Morse code, in one sentence?
Morse code is a system that spells out letters and numbers as combinations of short signals (dots) and long signals (dashes), separated by timed pauses, so that text can be sent as sound, light, radio or touch.
How does Morse code work?
Each character has a unique pattern of dots and dashes. A dash is three times as long as a dot. Pauses of one unit separate the symbols inside a letter, pauses of three units separate letters and pauses of seven units separate words. The receiver recognizes the rhythm of each pattern and writes down the letter.
What is Morse code used for today?
Mostly amateur radio, where it is called CW. It is also used by aviation navigation beacons to identify themselves, by naval signalmen with light, as a backup emergency signal, and in accessibility tools such as the Gboard Morse keyboard. Commercial telegraph and maritime use ended in the late 1990s and 2000s. See our page on whether Morse code is still used.
Is Morse code a language?
No. Morse code is a code, or more precisely an encoding: it represents the letters of an existing language such as English. You can write English, Spanish or German in Morse code, but there is no "Morse vocabulary" or grammar of its own.
Who invented Morse code?
Samuel F. B. Morse developed the electric telegraph in the 1830s, and his collaborator Alfred Vail did much of the work on the dot-and-dash alphabet. The international version used today was standardized in Europe in the 1850s and 1860s. Our history of Morse code tells the whole story.
What does SOS mean in Morse code?
SOS is ··· ––– ··· (three dots, three dashes, three dots), sent as one continuous pattern without gaps between the letters. It is the international distress signal, adopted in 1906 and in force from 1908. It is not an abbreviation; "Save Our Souls" was made up later as a memory aid.
See your own words in Morse code
Type anything in the translator and hear it played back at the speed you choose.