Morse Code Reader

What a Morse code reader does

A translator gives you the answer. A reader shows you the work. Instead of collapsing .... . .-.. .-.. --- straight into HELLO, the reader lines up each group of symbols with its letter, so you can see that .... is H, . is E, .-.. is L (twice) and --- is O. That makes it the right tool for three jobs: checking a message you wrote by hand before you send or engrave it, finding the exact spot where a received message went wrong, and learning the alphabet by seeing real words broken into their parts.

The reader follows International Morse (ITU-R M.1677): 26 letters, 10 digits and the standard punctuation. Any group it cannot match is shown in red with a question mark so you can fix it, rather than silently skipped. The counters track characters, words, dots and dashes, plus the time the message would take to send at the speed you set, which is useful if you are planning a flashlight signal or a recording.

Reading the rhythm: dits, dahs and the three gaps

Morse code is defined by time, and every length is a multiple of one unit, the dot. Operators say dit for a dot and dah for a dash because the words have the right lengths when spoken. Each card in the breakdown shows this spoken form, and saying it out loud is the fastest way to get the rhythm into your head.

• Dit = 1 unit of sound. Dah = 3 units of sound.
• Between the dits and dahs of one letter: 1 unit of silence.
• Between letters: 3 units of silence (written as a space).
• Between words: 7 units of silence (written as a slash).

Here is the word PARIS, which is the standard word used to define speed because it is exactly 50 units long. At 15 words per minute, one unit is 80 milliseconds and the whole word takes 4 seconds:

Compare the two-word message HI YOU. The long silence in the middle is the word gap; the reader shows it as a dashed card:

When you press Play & follow, the cards light up in time with the sound. Watch where the highlight pauses: a short pause within a card is a symbol gap, a longer one between cards is a letter gap, and the longest is a word gap.

The mistakes a reader catches

Almost every unreadable Morse message has a spacing problem, not a wrong symbol. The breakdown makes these visible at a glance:

• Letters run together. .-.. is L, but .- .. is A I. If a word decodes to nonsense, look for a missing space.
• Letters split in two. ..-. is F; typed as .. -. it becomes I N. Extra spaces are the most common slip when copying from a picture.
• Five-symbol groups. Any group of five dots and dashes is a digit. If a 5 appears in the middle of a word, two letters were joined.
• Mirror letters. A (.-) and N (-.), D (-..) and U (..-), B and V, G and W are reversals of each other. A message read from a bracelet worn upside-down will swap them.
• Wrong word gaps. If everything decodes but the sentence reads as one long word, the sender used single spaces where slashes belong.

Reading by eye and reading by ear

On screen, you read Morse by counting symbols and gaps. By ear, you do not count at all: you recognise the sound of each letter as a whole, the way you recognise a spoken word. That is why experienced operators dislike written charts. The reader bridges the two. Start by reading the cards, then play the message and try to say the letters before the highlight reaches them. When you can follow a short word at 15 WPM without looking, move to the practice quiz, which plays letters you have to identify from sound alone. Our guide on how to read Morse code goes deeper into both methods.