Morse code is a method of encoding text characters as standardized sequences of two different signal durations — dots (·) and dashes (−). Developed in the 1830s by Samuel Morse, it was originally used for telegraph communication. Each letter, number, and punctuation mark has a unique Morse representation. Dots are short signals (one time unit), while dashes are longer (three time units). The space between parts of the same letter is one unit, between letters is three units, and between words is seven units.

WPM stands for Words Per Minute — the standard measurement of Morse code transmission speed. One "word" is standardized as PARIS (a 5-character word), which equals exactly 50 time units. At 1 WPM, each time unit (dot duration) lasts 1200 milliseconds. The formula is: dot duration (ms) = 1200 ÷ WPM. So at 15 WPM, a dot lasts 80ms. Typical conversational CW (Continuous Wave) speeds range from 10–25 WPM, while experienced operators can handle 30+ WPM.

To decode Morse code manually: identify the boundaries between letters (spaces) and words (slashes or multiple spaces). Each Morse sequence maps to a specific character. For example, .... = H, . = E, .-.. = L, --- = O. With this tool, simply paste your Morse code (using dots, dashes, spaces, and slashes) into the Morse code field, and it will instantly decode to readable text. You can also type plain text to see its Morse equivalent in real time.

There's no single "official" tone frequency, but 600–800 Hz is the most commonly used range in amateur radio (ham radio) and training. This tool defaults to 700 Hz, which is comfortable for most listeners. You can adjust the tone from 400 Hz (deeper) to 1000 Hz (higher-pitched) using the slider. Lower frequencies around 500 Hz are sometimes preferred for long listening sessions, while higher tones around 800 Hz cut through noise better.

SOS is one of the most recognized Morse code signals: ... --- ... — three dots, three dashes, three dots — with no spaces between the letters. It was chosen as the international distress signal because of its simple, unmistakable pattern. Contrary to popular belief, SOS does not stand for any phrase like "Save Our Souls" or "Save Our Ship" — it was selected purely for its clear and easily recognizable rhythm.

Yes! Morse code works with any medium that can produce two distinct states — on/off, sound/silence, or light/dark. Visual Morse signaling using flashing lights (Aldis lamps) is still used in maritime communication. The U.S. Navy and Coast Guard use signal lamps for ship-to-ship communication when radio silence is required. Our tool's indicator light (the small dot next to the Morse code label) demonstrates this — it flashes in sync with the audio during playback.

While no longer required for amateur radio licensing in most countries, Morse code remains valuable: it works with extremely low power (QRP operation), penetrates noise better than voice, requires minimal bandwidth, and functions when other digital modes fail. It's also a fun mental challenge, a piece of communications history, and a backup communication method in emergencies. Many ham radio operators worldwide still use CW daily.