Happy Birthday in Morse Code

Happy birthday in Morse code is 13 letters long: 25 dots and 16 dashes, 41 signals in all. The Play button above sends it at 14 words per minute, so the whole message lasts about 12 seconds; the WAV file you download is the same clip. Copy the dots and dashes into a card, flash them when the cake comes out, or save the pattern as an image and text it to the birthday person.

Pick the format by how the person will receive it: by ear, by eye across a room, or on paper they can keep.

Leave the plain words off the front of a card. Uncheck "Show the words under it" before you save, and a note inside pointing to the Morse decoder lets them work out the message themselves.

The slash between HAPPY and BIRTHDAY is not a signal you send; it marks a silence of seven units. Inside a letter the gaps last one unit, between letters three, and between words seven, which is why the pause after HAPPY is the longest silence in the message. At 14 WPM that word gap is about 0.6 seconds, more than twice the 0.26-second gap between letters.

The same rule changes how the message looks in each format. On a card the slash becomes a wider space, in the sound clip it is the long pause in the middle, and on a bracelet it is one ring between the two words. Drop it and a listener hears one 13-letter word.

Most people want "Happy birthday, Sam" rather than the bare phrase. Leave out the comma: the name becomes a third word, so the code gets a second slash and a third seven-unit pause.

"Happy birthday Sam" grows to 48 signals and plays in about 14.7 seconds at 14 WPM; "Happy birthday Mom" is also 48 signals but runs about 15.3 seconds, because M and O are all dashes.

Two letters in this phrase look alike at a glance: P is .--. and B is -..., both four signals mixing one or two dashes with dots (P is dot-dash-dash-dot, B is dash-dot-dot-dot), and copying P where B belongs turns BIRTHDAY into PIRTHDAY on a card. H is four dots, the most dots of any letter here, while T is a single dash, the fewest signals, so count the dots in both H's before you copy by hand.

The quickest check is to paste your finished pattern into the Morse decoder and confirm it reads back as HAPPY BIRTHDAY. Do this before printing, engraving or inking anything.

The full phrase does not fit on a wrist. As a bracelet it needs 41 beads, 25 round for the dots and 16 long for the dashes, plus 11 spacers and 1 ring between the words; with 4 mm beads that strand is about 11.5 inches long, and with 6 mm beads about 17 inches, against a 7-inch bracelet.

For a tattoo, 41 signals is long for one line. Choose the Down / spine layout in the image options, or the Tattoo style under Make it yours, to stack the two words, and keep dashes at three times the length of the dots so the pattern stays readable. The Morse code tattoo page exports a stencil at the size you choose.