To blink Morse code, use a quick blink for a dot and close your eyes for about one second for a dash. Keep your eyes open for a short beat between signals, a longer beat between letters, and a long pause between words. SOS is three quick blinks, three long blinks, three quick blinks.
The blink timing that works
Morse code is a rhythm of short and long signals. With radio or sound, the timing is exact: a dash is three times as long as a dot. Eyelids are not that precise, and a natural blink is already quick, so blinking needs bigger, more obvious differences.
| Part of the message | What to do with your eyes | Rough length |
|---|---|---|
| Dot | One quick, deliberate blink | Under half a second |
| Dash | Close your eyes and hold | About 1 second |
| Gap inside a letter | Eyes open | About half a second |
| Gap between letters | Eyes open, steady | About 1½ seconds |
| Gap between words | Eyes open, or a small nod | 3 seconds or more |
The exact numbers matter less than consistency. If every dash is clearly longer than every dot, and every letter gap is clearly longer than the gaps inside a letter, the message can be read.
Step by step: blink your first message
- Look up the code. Type your word into the Morse code translator or check the Morse code alphabet. Keep it short: one to four letters is ideal while you learn.
- Say it in your head. Many people find it easier to think "dit" for a dot and "daaah" for a dash. HELP is .... . .-.. .--., so: dit-dit-dit-dit, pause, dit, pause, dit-daaah-dit-dit, pause, dit-daaah-daaah-dit.
- Blink it slowly in front of a mirror or your phone's front camera. Recording yourself is the best check, because you will see whether your dashes are really longer than your dots.
- Play it back and decode it. Write down what you see, then paste it into the translator. If you get a different word, the usual problem is a missing letter gap.
Start with these short words:
| Word | Morse code | Listen |
|---|---|---|
| SOS | ... --- ... | |
| YES | -.-- . ... | |
| NO | -. --- | |
| OK | --- -.- | |
| HELP | .... . .-.. .--. | |
| WATER | .-- .- - . .-. |
Why letter gaps matter so much
In Morse code, the pause is part of the message. Run the signals together and the meaning changes:
- .. is the letter I, but . . (two dots with a gap) is EE.
- .- is A, but . - is ET.
- ... is S, but . . . is EEE.
When you blink, a rushed letter gap is the most common mistake. If in doubt, make the pause between letters longer.
How to read someone else's blinks
Reading is harder than sending, because you cannot ask the sender to slow down halfway through a letter. These habits help:
- Agree on a start signal first, such as a long, slow blink or a nod, so you know when a message begins.
- Write as you watch. Use
.for a quick blink and-for a long one. Put a space when there is a longer pause, and a/for a word break. - Do not decode in your head while watching. Just record the pattern, then decode it afterwards. This is how trained operators copy fast Morse.
- Paste what you wrote into the translator. It reads
.-_and/, and it marks any group that does not match a letter, which usually means a gap was missed. - Ask for a repeat. A single blink of agreement, or the word OK, is a simple way to confirm you understood.
If you want to practise reading, play a word in the translator with the Light option turned on in the sound settings. The lamp flashes each dot and dash, which is good training for reading a blinking eye or a flashing torch.
A famous blinked message
The best-known blinked message in history came from a prisoner of war. In 1966, US Navy pilot Jeremiah Denton, held captive in North Vietnam, was made to appear in a televised propaganda interview. While answering questions and appearing to squint at the bright lights, he blinked the word TORTURE in Morse code:
- --- .-. - ..- .-. .
US Naval Intelligence picked up the message. It was the first confirmation that American prisoners there were being tortured. Denton was released in 1973 and later served as a US senator. (Source: Wikipedia)
Blinking and Morse code for accessibility
Because Morse code needs only two signals, it can be sent with almost any small movement: an eye blink, a finger tap, a puff of breath, or a single switch. That makes it useful for people who cannot speak or use a keyboard easily. Google built Morse code typing into its Gboard keyboard with help from developer Tania Finlayson, who has cerebral palsy and uses Morse code to communicate. (Source: BGR, July 2018)
For people who rely on blinking to communicate because of illness or injury, a speech and language therapist can recommend the right system. Blink Morse works best when both people have practised it beforehand.
Practise with the translator
Type any word below and press Play. Watch the signal trace: the high blocks show exactly how long each blink should be compared with the pauses.
Frequently asked questions
How do you blink SOS in Morse code?
Blink three times quickly, close your eyes for about a second three times, then blink three times quickly again. As a distress signal, SOS is sent as one continuous pattern, ...---..., so you do not need long pauses between the letters. Read more on the SOS in Morse code page.
How long should a dash be when blinking?
About one second, or roughly three times as long as a quick blink. What matters most is that every dash is clearly longer than every dot.
Can you blink "I love you" in Morse code?
Yes. "I love you" is .. / .-.. --- ...- . / -.-- --- ..-. A shorter, popular version is ILY, .. .-.. -.--. See I love you in Morse code for tap and light versions.
Is there an app that reads blinking Morse code?
Some apps use the camera to detect blinks, but accuracy depends on lighting and how steady the person's timing is. For now, the most reliable method is to write down the pattern as you watch and decode it with a Morse code translator.