Use the microphone (Live Morse Listener)Capture a local recording, then decode when you stop.
Real-Time Morse Code Listener & Audio Decoder
Morse Code Audio Decoder & Listener: Translate Sound to Text
Translate Morse code audio to text using our online audio decoder and live Morse code listener. Decode sound beeps from uploaded MP3 and WAV files, or capture real-time CW signals through your microphone with automatic frequency and WPM detection.
Processed locally in your browser. Recordings are not uploaded by this page.
Decode Morse audio
Automatic mode estimates frequency and speed. Switch either field to Manual when a noisy or irregular recording needs correction.
The selected alphabet changes how detected dot-and-dash groups are mapped into characters. Digits remain available across supported alphabets.
Analyse an audio fileUse a browser-supported audio file such as WAV, MP3, M4A, OGG, or AAC.
No file ready? Generate “MORSE TEST” at 18 WPM and run it through the same automatic audio decoder.Ready. Use a clear CW/Morse tone for the strongest automatic decode.
Adaptive controls
Speed, tone, and volume window
Auto spacing estimate
dB
Discard quieter energydB
Clip louder energyTone on above threshold
Signal analysis
Spectrogram and Morse timing
Upload or record Morse audio to generate a real time-frequency spectrogram.
Range: 200 to 1800 Hz
How the CW audio decoder works
Morse Code Audio to Text: Tone Detection & Evidence Inspection
1. Find a prominent tone
The decoder scans the Morse/CW frequency range and selects the strongest candidate unless you lock the frequency manually.
2. Apply the volume window
Minimum and maximum dB controls discard energy outside the selected range. The threshold then separates tone-on frames from gaps.
3. Estimate timing
On/off runs are compared with likely 1-unit, 3-unit, and 7-unit Morse timings to estimate WPM, dits, dahs, character gaps, and word gaps.
4. Decode and diagnose
Detected groups are mapped through the selected alphabet. The spectrogram, timing barcode, confidence, and warnings let you inspect why a result succeeded or failed.
From sound to readable text
How to Decode Morse Code from Audio or Microphone (Audio to Text)
Upload a supported audio file or record through your microphone. The tool searches for likely CW tones, estimates speed, separates marks from gaps, and converts the signal into Morse code and readable text. Start with automatic analysis, then review the evidence before changing frequency or WPM manually.
Choose the sound source
Upload a recording or start the microphone. For live sound, place the microphone close enough to the source that the Morse signal stands out from room noise.
Run the automatic analysis
Leave Frequency and WPM on Auto when the signal settings are unknown. The decoder compares likely candidates, while manual controls let you lock values you already know.
Read both outputs
Check both the detected Morse sequence and readable text. Comparing the two helps separate character-mapping errors from earlier signal or timing problems.
Review the evidence
Before trusting the text, check Stability, ranked frequency candidates, character confidence, and the Accepted, Review, or Abstain status.
CW Decoder Online: Transcribe Morse Code Audio to Text
This CW decoder online accepts microphone recordings and browser-supported Morse audio files. Common formats include WAV, MP3, M4A, OGG, and AAC when your browser can decode them. Support varies by browser and operating system, so WAV is a useful fallback.
WAVMP3M4AOGGAACMicrophone
The decoder works with audible International Morse or CW-style tones and can compare multiple likely frequencies. Recordings with one dominant signal are usually easier to interpret than mixes of simultaneous messages.
Morse Code Decoder WAV File: Sound to Text Accuracy
When decoding Morse code sound from audio recordings, uncompressed WAV files provide the highest transcription accuracy. Unlike lossy MP3 compression—which introduces pre-echo and temporal smearing around sharp audio transients—WAV recordings preserve exact dit and dah timing edges, making automatic WPM speed detection and signal thresholding significantly more reliable.
Whether transcribing recorded radio contest files, amateur radio DX pileups, or puzzle audio tracks, simply drop your WAV or MP3 file into the decoder to translate sound to plain English text automatically.
Static Audio Decoder: Isolating CW Radio from Noise
Amateur radio transmissions rarely arrive over a crystal-clear channel; atmospheric static, QRN bursts, and background receiver hiss often compete with the Morse carrier. This static audio decoder applies real-time digital bandpass filtering and adaptive squelch thresholding to lock onto dominant 400 Hz–900 Hz CW carriers.
When processing noisy microphone audio or weak shortwave radio recordings, adjust the squelch sensitivity slider and lock the target frequency to ensure clean character segmentation even under low signal-to-noise ratio (SNR) conditions.
Why Morse Audio Decoding Fails & How to Improve Sound Accuracy
A Morse code sound decoder must identify the signal, estimate speed, classify dits and dahs, and separate element, letter, and word gaps. An error at any stage can change the final text.
- Wrong carrier: a louder whistle, harmonic, background tone, or second transmitter can pull automatic frequency selection toward the wrong signal.
- Wrong speed: an inaccurate WPM estimate can move dit, dah, letter-gap, and word-gap boundaries.
- Room echo or microphone tailing: reverberation can make marks appear longer, compress short gaps, or blur nearby boundaries.
- Noise, speech, or music: unrelated energy can fragment real marks or create false tone segments.
- Changing timing: irregular hand keying, changing WPM, clipping, or fading can make one global setting fit only part of a recording.
- Competing signals: two strong carriers can each produce readable-looking but different text.
Confidence is not a guarantee
What Accepted, Review, and Abstain mean
Readable text is not always reliable. The decoder therefore separates the raw result from its evidence status.
The leading text has strong agreement across signal, timing, and nearby-parameter checks, with no major conflicting candidate detected.
The current text leads, but some evidence conflicts. Inspect nearby frequencies, timing settings, segmentation, or uncertain characters before relying on it.
The raw text remains visible, but the decoder does not endorse it. Nearby settings may disagree, signal separation may be weak, or a competing carrier may produce different text.
Improve the source before forcing the answer
Tips for better Morse sound decoding
A clear CW signal is easier to track than several simultaneous beeps, whistles, or transmitters.
Heavy distortion can flatten the signal envelope and damage the boundaries between marks and gaps.
Background audio can create false segments around the real Morse tone. Use a cleaner source or quieter environment when possible.
A stronger direct signal can reduce the relative effect of room echo and background noise.
Choose the right Morse tool
Morse Code Audio Decoder vs Text Translator
Use the audio decoder for sound
Choose this page for recordings, live microphone input, CW tones, or Morse beeps: sound → detected signal → timing → Morse → text.
Use the translator for text or symbols
Choose the main translator when you already have text, dots and dashes, or written Morse notation. It converts directly between text and Morse symbols.
Open Morse Code TranslatorDecode Morse code from images
If your Morse code is inside a picture, photo, or screenshot, use our image translator to detect dots and dashes with visual bounding boxes.
Translate from ImageMaster Morse code by sound
Learn how to receive Morse code at 15–20 WPM using the scientific Koch method and Farnsworth timing without counting dots.
How to Learn Morse CodePrintable Morse code chart
Keep an international Morse code chart sheet by your transceiver or desk with full A–Z alphabet, numbers, and prosigns.
Printable Morse ChartTrain audio receiving skills
Ready to practice copying live CW audio by ear? Take interactive receiving drills with adjustable character and Farnsworth speeds.
Practice Morse by EarTest audio recognition
Challenge your ears with 10-question listening quiz rounds covering letters, numbers, and short words with instant score tracking.
Take Morse Code QuizStudy the complete alphabet
Reference all standard Latin letters, numbers, and punctuation marks, or download a printable PDF chart for your ham radio shack.
Open Alphabet ChartPractice a known distress signal
Use the dedicated SOS page to hear and watch the continuous ...---... pattern, compare its timing with spaced letters, and download WAV audio.
Play SOS in Morse CodeSynthesize CW audio & WAV sound
Need to generate Morse code sound instead of decoding? Customize tone frequency from 400 Hz to 1000 Hz, set Farnsworth timing, and export WAV audio.
Morse Sound GeneratorOptical light & flashlight signaling
Transmit Morse code through your screen or camera strobe, with calibrated WPM flashing rhythms and instant emergency strobe activation.
Morse Light TranslatorStep-by-step guide
How to Decode Morse Code Audio and Sound to Text
Upload Audio File or Activate Microphone
Select a WAV, MP3, M4A, or OGG recording from your device, or click 'Listen' to capture acoustic Morse code beeps in real time through your microphone.
Tune Tone Pitch and Noise Threshold
Leave Pitch on 'Auto' for automatic carrier detection, or lock the frequency (typically 500 Hz–800 Hz) and adjust the Squelch threshold slider to filter background hiss and radio static.
Inspect Spectrogram and Signal Confidence
Examine the dynamic waterfall spectrogram and character confidence scores to verify that dot and dash durations align with standard ITU 1:3 timing ratios.
Copy Decoded Plaintext or Morse Code Sequence
Click 'Copy Text' to copy the transcribed English message directly to your clipboard, or copy the normalized dots and dashes sequence for secondary verification.
Common questions
Morse Code Audio Decoder & Listener FAQ
How do I decode Morse code audio and sound to text?
To decode Morse code audio to text, upload an MP3 or WAV file, or click 'Listen' to capture live CW audio with your microphone. Our browser-based decoder automatically detects the tone pitch (400–900 Hz) and WPM transmission speed, transcribing sound beeps into plain English letters in real time without external software.
Can I decode Morse code from a WAV or MP3 audio file?
Yes, you can decode Morse code directly from WAV, MP3, M4A, AAC, and OGG audio files. Uncompressed WAV files provide the highest decoding accuracy because they avoid the audio compression artifacts and phase distortion common in MP3 recordings. Simply drag and drop your file into the decoder to transcribe sound to text.
What is an online CW decoder and how does it transcribe ham radio audio?
An online CW decoder is a web application that listens to continuous wave (CW) telegraphy audio signals from ham radio transceivers or WebSDR streams and transcribes them into readable text. Our decoder uses digital signal processing (DSP) to analyze tone pitch (500–800 Hz) and adaptively calculate transmission speed in words per minute (WPM).
How does this static audio decoder read Morse code from audio with background noise?
This static audio decoder employs narrow bandpass filtering and an adaptive squelch threshold to isolate the dominant Morse code carrier from atmospheric radio static, white noise, and background room echoes. You can also manually adjust the target frequency slider to isolate weak CW signals.
What is a Morse code listener and how does it decode audio?
A Morse code listener is an online tool that captures acoustic Morse code audio through a live microphone or audio recording and decodes sound beeps into readable text. Using DSP algorithms, our listener filters static noise, detects tone frequencies between 400 Hz and 900 Hz, and transcribes CW transmissions with zero software installation.
Can this Morse code decoder capture and decode live microphone audio?
Yes, you can use this Morse code audio decoder directly with your device's microphone. Click 'Listen', grant microphone permission, play the Morse audio near your microphone, and our listener will isolate the audio beeps, plot the acoustic spectrogram, and transcribe the text.
How do beginners learn to read Morse code sound by ear?
Beginners learn to read Morse code sound by memorizing the rhythmic melody ('di-dah') of each character rather than counting visual dots and dashes. Using the Koch method and Farnsworth timing at 15–20 WPM with prolonged spacing allows the human brain to recognize acoustic patterns naturally.
Can I decode Morse code audio from a video, phone recording, or voice memo?
Yes. If you have a video or voice recording on your phone, convert the audio to MP3 or WAV (or simply play the recording near your computer's microphone using the Listen feature) to decode the Morse code sound into text.
How does this audio morse code translator convert audio to morse code and text?
Our audio morse code translator analyzes recorded sound waves or microphone audio. It extracts tone pulses, converts the audio to Morse code dits and dahs, and immediately translates them into plain text.
Can this audio Morse decoder translate messages into plain English words?
Yes, the decoder translates raw acoustic signals first into normalized Morse dots and dashes, and then instantly maps those symbols into plain English words, numbers, and prosigns with automatic word-gap spacing.
Is this morse code audio decoder online free to use?
Yes, this morse code audio decoder online is 100% free and runs entirely in your browser without requiring software downloads or account registration.
Is my recording uploaded to a server?
No. Selected files and microphone captures are processed 100% locally in your browser using Web Audio and WebAssembly DSP algorithms; no audio data ever leaves your device.