International Morse Code: The Complete Reference Guide & Translator
Type or paste any text and instantly convert it to authentic ITU International Morse Code — or reverse the process and decode those mysterious dots and dashes back into plain English. Below you will find the complete standardized alphabet, numerals, punctuation marks, prosigns, and the official timing rules that have governed this system since 1865.
Selected: English / Latin (English) — supports Latin A-Z, 0-9, and punctuation
Supported Languages
While International Morse Code itself uses the Latin alphabet as its foundation, our translator supports text input in multiple languages — each mapped to the closest equivalent Morse encodings where character sets overlap.
English
English / Latin
Example: HELLO WORLD
Deutsch
German
Example: HALLO WELT
Français
French
Example: BONJOUR LE MONDE
Español
Spanish
Example: HOLA MUNDO
Русский
Russian
Example: ПРИВЕТ МИР
Ελληνικά
Greek
Example: ΓΕΙΑ ΣΟΥ ΚΟΣΜΕ
العربية
Arabic
Example: مرحبا بالعالم
日本語
Japanese (Wabun)
Example: イロハニホヘト
한국어
Korean
Example: 가나다라마
International Morse Code Alphabet (A–Z)
26 symbolsThese are the 26 letters of the Latin alphabet as defined by the ITU International Morse Code standard. Each letter maps to a unique sequence of dots (dits) and dashes (dahs). Memorize these first — they account for the vast majority of real-world Morse communication.
Numbers (0–9)
10 symbolsNumerals in International Morse Code follow an elegant symmetric pattern that makes them surprisingly easy to remember: 1 starts with one dot, 2 with two dots, continuing up to 5 which is all dots; then 6 through 9 mirror this pattern using leading dashes instead. Zero breaks the pattern slightly with five consecutive dashes.
Punctuation & Special Characters
17 symbolsThe punctuation marks and special characters most commonly used in International Morse Code. These cover everyday writing needs, amateur radio QSO conventions, and even email-style addresses.
Prosigns (Procedural Signals)
9 signalsProsigns are special two-letter combinations sent as a single continuous character in formal Morse communication. What makes them unique is the timing: the two component letters are run together with only a 1-dot pause between them (instead of the normal 3-dot inter-letter gap). This is why they are conventionally written inside angle brackets like <SK>.
Pro tip: When using our translator above, type any prosign using angle brackets — for example <SK>, <AR>, or <BT>. The encoder will apply the correct 1-dot intra-character spacing automatically.
What Exactly Is International Morse Code?
Here is the thing about International Morse Code — it is probably the most successful communication protocol ever invented. Developed in the mid-1800s, refined through decades of real-world telegraph use, and finally standardized at the 1865 International Telegraph Convention in Paris, this system encodes every letter, number, and common punctuation mark as a sequence of just two signals: a short one called a dit (or dot) and a long one called a dah (or dash).
The "International" part matters. Before 1865, different countries and telegraph companies used their own variations — most notably American Morse Code, which included tricky intra-character pauses that made it faster for seasoned operators but brutally difficult for newcomers. The Paris convention changed all that by establishing a single universal standard: no internal gaps within characters, strictly two signal lengths, and consistent timing ratios. This is the version formalized today under ITU-R M.1677, and it is what virtually everyone means when they say "Morse Code" without any qualifier.
What makes International Morse Code genuinely remarkable is how stubbornly it has refused to die. Long after the last commercial telegraph line went dark, the code found new life in radio. It became the backbone of maritime distress communication for over a century — that famous SOS pattern (... --- ...) is still universally recognized, even by people who have never touched a telegraph key. When the International Maritime Organization officially retired Morse for shipping distress calls in 1999, observers predicted its demise within a decade. They could not have been more wrong.
Today you will find International Morse Code in surprisingly diverse places: amateur radio operators chatting across continents on the HF bands, pilots identifying navigation beacons, people with disabilities using it as an assistive communication method, jewelers encoding secret messages in necklaces and rings, tattoo artists inking meaningful dot-dash patterns. The reason is simple: all you need to send Morse is something that can switch on and off. A flashlight. A mirror. A tapped pipe. That minimal hardware requirement keeps it relevant where fancy digital comms fail.
Practically speaking, here is how the rhythm works: individual dots and dashes within one letter are separated by a pause equal to one dot-length. Letters within the same word get a three-dot pause between them. And words are separated by a seven-dot silence — which, when written down on paper, we represent with a forward slash (/). The entire elegant system scales perfectly from slow beginner speeds (5 WPM) up to expert copy rates exceeding 40 WPM.
Timing Rules: How Dots, Dashes & PARIS Fit Together
Everything in International Morse Code timing traces back to one fundamental unit: the length of a single dot. Every other duration — dashes, gaps, word spaces — is defined as a multiple of that base unit. This elegant simplicity is what keeps the code unambiguous even when sent at blistering speeds. Speed itself is measured in words per minute (WPM) using a clever reference word: PARIS. Spell P-A-R-I-S in Morse and you get exactly 50 dot-units total.
The atomic building block. Every other measurement derives from this.
Precisely three times longer than a dot. No exceptions.
The tiny silence between dots/dashes inside a single letter.
Pause between consecutive letters in the same word.
The longer silence separating words. Written as a slash.
Reference word defining 1 WPM. P-A-R-I-S = 50 dot-units exactly.
Calculating Dot Duration at Any Speed
Want to know exactly how long each dot should last at a given speed?
dot_duration (seconds) = 1.2 / WPM Example calculation at 20 WPM: dot = 1.2 / 20 = 0.060 s (60 ms) dash = 3 x 60ms = 0.180 s (180 ms) letter gap = 3 x 60ms = 0.180 s word gap = 7 x 60ms = 0.420 s
At 20 WPM, a skilled operator sends roughly 3 characters per second. World-class competitors routinely copy plain-text Morse at 40+ WPM.
International Morse Code FAQ
What is the difference between International Morse Code and American Morse Code?+
International Morse Code (also called Continental Morse Code) uses a standardized system where every character consists of only dots and dashes with consistent timing. American Morse Code, developed earlier by Samuel Morse and Alfred Vail, includes intra-character pauses (gaps within a single letter) which made it faster for skilled operators but much harder to learn. The international version was officially adopted at the 1865 International Telegraph Convention in Paris and is now governed by ITU-R M.1677. Today, virtually all amateur radio, aviation, and emergency communications use the international standard.
When was International Morse Code officially standardized?+
International Morse Code was codified in 1865 during the International Telegraph Convention held in Paris, France. This same conference established the International Telegraph Union (ITU), which later became the modern ITU (International Telecommunication Union). The current technical specification is defined in ITU-R M.1677, last updated to reflect modern usage while preserving the original character encodings that have remained unchanged since the 19th century.
How many characters are there in International Morse Code?+
The complete International Morse Code standard contains 26 Latin letters (A-Z), 10 Arabic numerals (0-9), approximately 16 punctuation marks and special characters, plus around 9 procedural signals (prosigns) used in formal communication. That brings the total to roughly 61 distinct encodings, though most people only need to memorize the 26 letters and 10 numbers for everyday use.
Is International Morse Code still used today?+
Absolutely. While commercial maritime distress calls switched to GMDSS in 1999, International Morse Code remains very much alive. Amateur radio operators use it daily on the HF bands. Pilots recognize navigational aids via Morse identifiers. Some military forces still train personnel in it as an emergency backup. You will also find it in assistive technology, jewelry, tattoos, and among hobbyists who appreciate its elegance and history.
What does SOS mean in International Morse Code?+
In International Morse Code, SOS is represented as three dots, three dashes, three dots: ... --- ... . It was chosen as a distress signal not because it abbreviates anything (the popular "Save Our Souls" backronym came later), but because the sequence is unmistakable, easy to remember, and recognizable even through heavy static. The prosign for distress is sent as one continuous signal without pauses between letters.
How long does it take to learn International Morse Code?+
Most people can learn the basic alphabet and numbers in 2-4 weeks with 15-20 minutes of daily practice using methods like the Koch system or spaced repetition flashcards. Reaching conversational speed (12-15 WPM) typically takes 2-6 months. Achieving expert-level speeds of 20+ WPM usually requires a year or more of consistent on-air practice. The key is learning by sound first, not visualizing dots and dashes.
What are the timing rules for International Morse Code?+
All timing derives from one dot length (a "dit"). A dash is exactly 3 dot-lengths. Gap between symbols within a letter: 1 dot-length. Gap between letters in a word: 3 dot-lengths. Gap between words: 7 dot-lengths (written as "/"). Speed is measured in WPM using the reference word "PARIS" = 50 dot-units. At 20 WPM, each dot lasts 60 milliseconds.
Can I use International Morse Code on my phone or computer?+
Yes. Our free online translator lets you type text and convert it to properly timed International Morse Code with audio playback. You can also paste Morse code to decode it back to text. Many apps exist for iOS and Android for practice via visual flash or audio. Some ham radio operators even use phones as Morse keys connected to transceivers via audio interfaces.
Keep Learning
You now have the complete International Morse Code reference. Put it into practice with our training tools, or explore the numbers, alphabet, and prosigns in more detail.