Morse Signal Lab | TooManyLetters

Interactive signal console

Explore a Morse character

Choose any letter or number below. Hear the signal and watch its rhythm.

Ready to transmit

Selected characterLetter A

A

Dot = 1 timing unit · Dash = 3 units · The space inside one character = 1 unit

Signal lamp

Start with oppositesE is one dot. T is one dash. They are the simplest Morse patterns.

Practice by rhythmA is “short–long” (·—). N is “long–short” (—·).

Use the lamp tooEvery sound has a matching visual flash, so the pattern can be learned silently.

Letters A–Z

Click any tile to load and play it.

26 letters

Numbers 0–9

Morse digits use five signal elements each.

10 digits

Progressive practice

Practice patterns in small families

Begin with the shortest signals, then add one element at a time. Click any character to hear it.

Quick recognition

Score 0 / 0

E

Which Morse pattern belongs to this character?

Ear training

Listen & Decode

Hear one Morse character, then choose what you heard. Replay as often as you need.

Sound recognition

Score 0 / 0

Signal ready

Listen to the rhythm, then choose the letter.

Hands-on practice

Build Morse

Send the requested character using DOT and DASH. You can also use the keyboard: press D for dot and K for dash.

Send this characterA

Click DOT or DASH to start building

Build the code, then check your answer.

Practical utility

Text ↔ Morse Converter

Translate ordinary letters and numbers into International Morse Code, or decode Morse back into text.

Text to Morse

Spaces become word separators. Unsupported punctuation is ignored in this first version.

Morse to Text

Separate letters with spaces and words with / . Example: ... --- ...

How it works

About Morse Code

Morse represents characters as timed short and long signals. It can be sent by sound, light, electrical pulses, or any other two-state signal.

From telegraph to universal signal

Samuel F. B. Morse developed the electromagnetic telegraph and, working with Alfred Vail, developed an early dot-and-dash code. On 24 May 1844, Morse sent the famous first long-distance demonstration message from Washington, D.C. to Baltimore: “What hath God wrought?” Modern International Morse Code differs from early American Morse, but keeps the same essential idea: information represented by timed signals.

1830sMorse and collaborators develop the telegraph system and early code.

1844Historic Washington-to-Baltimore telegraph demonstration.

TodayInternational Morse remains standardized and is still used in radio, training, identification, and signaling.

The timing rule

The duration and spacing are what make Morse readable. A dash is three times as long as a dot.

Dot ·

Dash —

Within letter

Between letters

Between words

Technical reference: ITU-R Recommendation M.1677-1 defines International Morse Code and its signal timing. Historical overview follows the Library of Congress Samuel F. B. Morse collection.