Morse Code Translator

The translator encodes and decodes against the International Morse Code chart published by the International Telecommunication Union in ITU-R Recommendation M.1677-1. That chart fixes the dot-and-dash pattern for every letter, digit, and standard punctuation mark, and it fixes the timing ratios used for the audio and light playback.

Encoding (Text → Morse).Your text is uppercased — Morse has no case — then each character is looked up in the ITU table: A = .-, B = -..., and so on. Letters are joined with a single space and words with a /. Any character without an ITU mapping — emoji, accented or non-Latin letters — is collected into a notice rather than dropped without warning.

Decoding (Morse → Text). The input is split on the word separator, then on the letter separator, and each symbol is reverse-mapped through the same table. Common glyph variants are normalised first (· and • become a dot; −, –, and — become a dash), so codes pasted from other sites still decode. An unrecognised symbol renders as “�” and is counted.

Timing (sound & light). One “unit” — the length of a single dot — is 1200 / WPM milliseconds. A dot is 1 unit on, a dash is 3 units on, the gap between elements of a letter is 1 unit, between letters 3 units, and between words 7 units. The constant 1200 comes from the PARIS standard: the word “PARIS” plus its trailing space is exactly 50 units, so at 1 WPM each unit is 60000 / 50 = 1200 ms. The audio is a sine oscillator at your chosen pitch with short ramps on each element so the tone does not click.

Two cross-checks guard correctness on every keystroke. A round-trip test confirms that decoding the freshly encoded text returns the original, and a PARIS test confirms the timing model still sums “PARIS” to 50 units. The verified badge on the tool turns red if either ever fails.

The full ITU-R M.1677-1 set. Copy any row, or just type into the tool above — the per-character breakdown shows the same mapping for your input.

• ITU-R Recommendation M.1677-1 — International Morse code (chart + timing ratios)
• ITU-R Recommendation M.1172 — Miscellaneous abbreviations and signals (prosigns)
• ARRL — CW / Morse code timing and the PARIS WPM standard

The code chart and timing ratios on this page were last cross-checked against ITU-R M.1677-1 and the PARIS standard on 2026-06-09.