sprytools

Morse Code Converter

Free online Morse code converter. Translate text to Morse code or decode Morse back to text instantly. Includes audio playback, adjustable WPM speed, and full ITU character reference. 100% client-side.

Character Reference Table (ITU)

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Morse Code Converter

Convert text to Morse code or decode Morse back to text in real time. Type in either direction — the tool detects automatically. Play back the result as audio tones using the Web Audio API, adjust speed in WPM, and copy the output with one click.

How It Works

ITU Morse Code Standard

This tool follows ITU-R M.1677-1, the international standard used by amateur radio operators worldwide. Key timing ratios:

ElementDuration
Dot1 unit
Dash3 units
Inter-element gap1 unit
Inter-letter gap3 units
Inter-word gap7 units

Audio Playback

Click Play to hear the Morse code as tones. Use the WPM (Words Per Minute) slider to set transmission speed from 1 WPM (very slow) to 40 WPM (fast). The standard reference speed uses the word “PARIS” as the unit.

SOS — The Universal Distress Signal

SOS is ... --- ... — three dots, three dashes, three dots. It was adopted as the international distress signal in 1908 because the pattern is simple, unambiguous, and easy to recognize regardless of the operator’s speed.

Character Reference

CategoryCoverage
LettersA–Z (26 characters)
Digits0–9 (10 characters)
Punctuation. , ? ! / ( ) & : ; = + - _ ” $ @

FAQ

How do I convert text to Morse code?

Type any text into the input field and the tool instantly converts it to International Morse code (ITU standard). Letters are separated by spaces, words by " / ". The tool supports A–Z, 0–9, and common punctuation.

How do I decode Morse code to text?

Enter Morse code using dots (.) and dashes (-). Separate letters with a single space and words with " / ". The tool auto-detects Morse input and decodes it to plain text.

What is WPM in Morse code?

WPM stands for Words Per Minute — the speed at which Morse code is transmitted. The standard reference word is "PARIS" (50 dot-units). 5 WPM is beginner speed; 20+ WPM is considered proficient. This tool lets you set 1–40 WPM for audio playback.

What characters are supported?

All 26 Latin letters (A–Z), digits 0–9, and common punctuation including period, comma, question mark, exclamation mark, slash, parentheses, colon, semicolon, equals, plus, minus, underscore, quotes, dollar sign, and at-sign — all per the ITU-R M.1677-1 standard.

What is the SOS Morse code?

SOS is the international distress signal: three dots, three dashes, three dots — written as "... --- ...". It was chosen because it is easy to transmit and recognize, not because it stands for any specific phrase.