Last updated: March 2026
What is Morse Code?
Morse code is a character encoding system that represents letters, numbers, and punctuation as sequences of short and long signals — called dots and dashes. Invented by Samuel Morse and Alfred Vail in the 1830s, it was originally designed for electrical telegraph systems and became the backbone of long-distance communication for over 150 years.
The International Morse Code standard (ITU) assigns unique dot-dash patterns to each character. The letter E, the most common in English, is a single dot — the simplest possible signal. Less common letters like Q (--.-) require longer sequences. This design minimizes total transmission time.
Morse code served as the primary communication method from the 1840s through the 1990s, when digital communication finally replaced it for most commercial and maritime purposes. The famous first telegraph message, "What hath God wrought," was sent on May 24, 1844.
How to Use This Translator
Text to Morse: Type or paste any text in the left field. The Morse code equivalent appears instantly in the right field using dots (.) and dashes (-). Letters are separated by spaces, and words are separated by " / ".
Morse to Text: Paste or type Morse code in the right field using dots and dashes. Separate letters with spaces and words with " / ". The decoded text appears instantly in the left field.
Audio Playback: Press the Play button to hear your Morse code as audio tones. A 600 Hz sine wave creates crisp, clear dots and dashes. Adjust the speed from 5 to 20 WPM using the slider.
Visual Flasher: The circle indicator lights up in sync with the audio — yellow for active signals, dark during pauses. It's a great way to practice visual Morse code recognition.
Morse Code Alphabet Chart
The International Morse Code assigns a unique pattern of dots and dashes to each character. The most frequently used letters in English have the shortest codes: E is just a single dot (.), T is a single dash (-), and A is dot-dash (.-).
Numbers follow a logical pattern: 1 starts with one dot followed by four dashes (.----), 2 has two dots and three dashes (..---), continuing up to 5 (all dots: .....) and then reversing — 6 starts with a dash followed by four dots (-....), down to 0 (all dashes: -----).
Open the Reference Chart section above the content area to see the complete lookup table for all letters, numbers, and punctuation marks supported by this translator.
History of Morse Code
Samuel Morse, an American painter turned inventor, conceived the telegraph in 1832 and developed the code with his assistant Alfred Vail. The first successful telegraph line connected Washington, D.C. to Baltimore in 1844. Within two decades, telegraph wires spanned continents and crossed oceans.
SOS became the international distress signal in 1906, replacing the earlier CQD signal. Its pattern (... --- ...) was chosen not for any acronym but because it was unmistakable and easy to send under stress. The Titanic famously transmitted both CQD and SOS during its 1912 sinking.
Maritime Morse code requirements were officially retired in 1999, replaced by the Global Maritime Distress and Safety System (GMDSS). However, amateur radio operators worldwide still use Morse code daily, and it remains a required skill for some military communications.
Frequently Asked Questions
What is Morse code?
Morse code is a method of encoding text characters as sequences of dots (short signals) and dashes (long signals). Developed in the 1830s by Samuel Morse and Alfred Vail for use with the telegraph, it became the primary long-distance communication system from the 1840s through the 1990s. Each letter, number, and punctuation mark has a unique pattern.
How do I read Morse code?
Each letter is represented by a unique combination of dots (.) and dashes (-). A dot is a short signal and a dash is three times longer. Letters are separated by spaces, and words are separated by a slash (/) or a longer pause. For example, SOS is '... --- ...' — three dots, three dashes, three dots.
What does SOS mean in Morse code?
SOS (... --- ...) became the international distress signal in 1906. Contrary to popular belief, SOS doesn't stand for 'Save Our Souls' or 'Save Our Ship' — it was chosen because the pattern (three dots, three dashes, three dots) is easy to transmit and recognize, even by untrained operators.
Is Morse code still used today?
Yes, though less commonly than in its heyday. Amateur radio operators still use Morse code (called CW or continuous wave). It's also used in aviation navigation aids (VOR/NDB stations identify themselves in Morse), emergency signaling, and accessibility tools for people with limited mobility.
What is the speed of Morse code measured in?
Morse code speed is measured in words per minute (WPM). The standard reference word is 'PARIS', which contains 50 dot-units. At 12 WPM (a common beginner speed), each dot lasts 100 milliseconds. Professional operators often work at 20-30 WPM, and some can exceed 40 WPM.
Can I use this translator offline?
This tool runs entirely in your browser using client-side JavaScript and the Web Audio API. Once the page is loaded, all translation, audio playback, and visual flashing work without an internet connection. No data is sent to any server.