Tools › Audio
Audio
Work on sound files without installing anything: trim, reverse and normalise a clip, read or strip its tags, measure its loudness, see it as a spectrogram, tune an instrument, keep time with a metronome, generate tones and DTMF, and join or split audiobooks.
Tone GeneratorPlay a tone at any frequency or musical note, as a sine, square, triangle or sawtooth wave, glide from one pitch to another, or make white, pink or brown noise, and save it as a WAV file.
DTMF TonesMake the tones a phone keypad plays (DTMF, or touch tones) for any number, to hear or save, and find the keys pressed in a recording.
Audio TrimmerCut a sound file down to the part you want, and if you like play it backwards, speed it up or slow it down, make it louder, quieter or normalised, fade it in and out, or make it mono, then save it as WAV, AAC (.m4a) or MP3.
Tap Tempo & MetronomeTap along to music to find its tempo in beats per minute, and play a steady metronome at any tempo, with the first beat of each bar accented.
Audio TagsSee the details and tags inside a sound file (title, artist, album, cover pictures, the software that made it, its length and quality, and an audiobook's chapters) and save a copy of an MP3, FLAC, WAV, M4A or M4B without them.
TunerPlay or sing a note into your microphone to see which note it is, its frequency, and how many cents sharp or flat it is, with concert pitch set to any A from 400 to 480 Hz.
Loudness MeterMeasure a sound file's loudness as streaming services and broadcasters do (integrated loudness in LUFS, loudness range and true peak), see how it compares with the usual targets, and save a copy turned up or down to the target you choose.
Audiobook MakerPut a book's chapters together, one sound file each, into a single M4B audiobook with a chapter list, the title, author, narrator and a cover picture, ready for Apple Books and other audiobook players.
Audiobook SplitterSplit an M4B audiobook (or any M4A with chapters) into one file a chapter, keeping the sound exactly as it is, or as MP3s for players that don't take M4A, with each chapter's title and number.
Sound Effect GeneratorShort sound effects made from a number: the same number always makes the same sound. Play random ones until one fits, then save it as a WAV, MP3 or AAC file for a notification or an automation. A browser version of the SEG command line tool.
Podcast Feed BuilderWrite the RSS feed for a podcast of your own: the show's details and an episode for each sound file, with its address, size, length and date. Drop sound files to fill in the episodes, or open a feed to edit it.
Sound Level MeterMeasure how loud it is through your microphone: the level in dBFS, an A-weighted estimate in decibels with a calibration offset you set, and the highest level heard so far.
SpectrogramTurn text or a picture into a sound that draws it in a spectrogram, and see the spectrogram of any sound to find pictures hidden in it, in heat, greyscale or print colours, on a linear or logarithmic scale, and save it as a PNG.
Guides
Making an audiobook from recorded chaptersTurn a chapter-by-chapter recording into one M4B audiobook: trim each chapter, match their loudness, add a cover, join them with a chapter list, and check the result.
Practising music: tuning, tempo and slowing it downTune your instrument, find a song's tempo and practise to a metronome, play a drone or reference note, and slow a hard passage down so you can learn it by ear.
Making a private podcast feed of your own recordingsListen to your own recordings, notes or articles read aloud in your podcast app: trim and level each episode, check its tags, put the files on your web space and write the RSS feed that apps follow.
Getting a sound clip ready to useTurn a raw recording into a clip for a podcast, course or video: cut it to length, fade it, check for hum, set its loudness to the target the platform uses, and remove the details it carries.