Audio Tools
Small audio jobs that would otherwise mean opening a DAW. Slow a recording down without dropping its pitch, check how loud a room is, practise to a click, hear what a Morse message sounds like, fold a stereo file to mono, generate a sine wave at an exact frequency, or turn a WAV into an MP3. All of it runs on the Web Audio API in your browser.
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Every Audio tool
8D Audio
Rotate any song around the listener's head, 8D style.
Audio Channel Swapper
Swap stereo channels, copy one side to both, or invert polarity.
Audio Comparison
Compare two audio files by the numbers and by ear, loudness-matched.
Audio Compressor (Dynamics)
Compress dynamics with threshold, ratio, attack and release.
Audio Duration Sum
Add up the total duration of a batch of audio files.
Audio File Compressor
Shrink any audio file to a target size as MP3.
Audio Info Inspector
Read the sample rate, channels, bitrate and levels of any audio file.
Audio Joiner
Merge several audio files into one, in order, with optional gaps.
Audio Looper
Repeat a selected clip many times with seamless crossfaded joins.
Audio Mixer
Layer several audio files to play together, with clip-safe levels.
Audio Normalizer
Normalise audio to a peak dBFS or LUFS loudness target, in browser.
Audio Padder
Add exact seconds of silence before or after any audio file.
Audio Reverser
Reverse a whole audio file or one selected part, export WAV or MP3.
Audio Speed Changer
Speed up or slow down audio, keeping pitch or shifting it like tape.
Audio Speed and Pitch
Slow down, speed up or transpose an audio file, then export WAV.
Audio Splitter
Split one audio file into equal parts or fixed-length chunks, zipped.
Audio Stereo Widener
Widen or narrow the stereo image with mid/side gain.
Audio Trimmer
Drag in and out points on a waveform, export WAV or MP3.
Audio Volume Changer
Boost or cut audio volume in decibels, whole file or one section.
Audio to Base64
Turn a short audio clip into a base64 data URI.
Audio to CSV/JSON
Export raw audio samples as CSV or JSON for analysis.
Audio to OGG/WebM
Encode audio to WebM or OGG Opus, or MP4 AAC, locally.
Audio to WAV
Convert MP3, M4A, FLAC or OGG to 16- or 24-bit WAV.
BPM Detector
Detect the BPM of any audio file and export a click track.
Bass Booster
Boost bass with a low shelf and a limiter, in browser.
Bit Depth Converter
Convert 24-bit to 16-bit WAV with proper dither.
Clipping Detector
Scan any audio file for clipped samples and list where the flat tops are.
DC Offset Checker
Measure the DC offset of each channel and remove it.
Decibel Meter
Read live sound level in decibels from your microphone.
Distortion and Bitcrusher
Distortion, bit reduction and sample-rate crushing for lo-fi sound.
Echo and Delay
Add echo with delay time, feedback and mix controls.
Equalizer
Boost or cut ten frequency bands and export the result.
Extract Audio From Video
Rip the audio track from a video to MP3 or WAV.
Fade In and Fade Out
Add fade in and fade out with a chosen curve, export WAV or MP3.
Frequency Detector
Read the frequency and nearest note of any sustained tone live.
Key Detector
Detect the key of any song and get its Camelot code for mixing.
Loudness Meter
Measure LUFS and true peak and check them against Spotify, YouTube and broadcast targets.
Low-pass and High-pass Filter
Cut frequencies above or below a point to remove rumble or hiss.
Metronome
Drift-free metronome with accented downbeats and WAV export.
Mono to Stereo
Turn mono into stereo, duplicated or Haas-widened, with balance.
Morse Code Sound
Type a message and hear it keyed as real Morse code.
Noise Gate
Mute background noise below a threshold between words.
Phase Checker
Check a stereo file for phase problems and mono compatibility.
Pitch Shifter
Transpose audio in semitones with the tempo unchanged.
Reverb
Add room, hall, plate or cathedral reverb to audio.
Sample Rate Converter
Resample audio to 44.1, 48, 16 kHz or any common rate.
Silence Finder
Find and timestamp every silent gap in a recording.
Silence Remover
Shorten every long pause in a recording to a fixed gap, automatically.
Silence Trimmer
Cut leading and trailing silence automatically with a threshold and pad.
Spectrogram
Turn any audio file into a spectrogram image, time against frequency.
Spectrum Analyzer
Live FFT spectrum of the microphone or any audio file, in browser.
Stereo to Mono
Downmix stereo audio to mono and export it as WAV.
Telephone and Radio Effect
Telephone, radio, walkie-talkie and megaphone voice presets.
Tone Generator
Play any frequency as a pure tone and export it as WAV.
Vocal Remover
Remove or isolate centre-panned vocals from a stereo song.
Voice Recorder
Record from your mic, trim on a waveform, save as WAV or MP3.
WAV to MP3
Encode WAV or other audio to MP3, without uploading it.
Waveform Viewer
Zoom into any audio file and save its waveform as a PNG image.
Changing a recording
Audio pitch and speed loads a file and lets you adjust tempo and pitch separately — slow a passage to learn it, or transpose a backing track to a singer's key — and export the result. Stereo to mono mixes both channels to one, which halves file size for voice recordings and fixes the phase problems that occur when a stereo file is played through a single speaker. WAV to MP3 encodes uncompressed audio at a chosen bitrate for sharing or upload, using an encoder that runs in the browser.
Measuring and keeping time
The decibel meter uses the microphone to show the current and peak sound level, with the caveat the page states plainly: a laptop microphone is not a calibrated instrument, so treat it as a relative reading. The metronome plays a click at any tempo with accent patterns and subdivisions, timed by the audio clock rather than a JavaScript timer, so it does not drift.
Generating sound
The tone generator produces sine, square, triangle and sawtooth waves at any frequency and volume, for testing speakers, tuning, or finding the resonant frequency of a room. Morse sound plays text as Morse at a chosen speed and pitch, and is the companion to the text-based translator in the encoding tools.
Formats
The file-based tools accept whatever the browser can decode — WAV, MP3, OGG, FLAC and AAC in current browsers — and export WAV or MP3. Long files are processed in chunks so a full-length recording does not lock up the page, and the tools show progress while they work. Sample rate and channel count are preserved unless a tool exists specifically to change them.
Microphone and file access
The meter is the only tool that needs the microphone, and the browser asks before it is used. Files you load are decoded and processed on your device; nothing is recorded, uploaded or kept, and closing the tab discards everything.