Free audio tools that run in your browser

Check a recording for noise, hum and clipping, and hear its first 20 seconds repaired, free.

Check a video's sound for noise and hum, and hear its first 20 seconds repaired.

Measure mains hum at 50 or 60 Hz, and hear it notched out with its harmonics, even when it comes and goes.

Measure steady hiss from a tape or a preamp, and hear the first 20 seconds with it lowered.

Find the dense ticks that run through the pauses of an old transfer, and hear each one redrawn from the sound around it.

Hear low rumble from traffic, handling or wind turned down below 300 Hz in the first 20 seconds.

See where a recording clips, and hear the flattened peaks partly raised back from the samples around them.

Find the holes of digital silence in a recording, and hear the short ones filled from the sound on each side.

Hear the treble a phone line cut off above 4 kHz rebuilt from the sound below it, labelled inferred.

Upscale speech saved at 16 kHz to 48 kHz, with the treble rebuilt from the sound below 8 kHz and labelled inferred.

Raise a quiet recording until its loudest peak reaches -1 dBFS, and go further with a limiter that keeps the peaks there.

Measure a computer or laptop fan under a voice, and hear 20 seconds with it lowered.

Learn when the echo of a room is reduced, and hear the first 20 seconds of yours.

Lower café chatter or a television behind the speaker in the first 20 seconds.

Measure the rush, rumble and hum of air conditioning, and hear 20 seconds repaired.

Hear road roar and truck rumble lowered under a voice in the first 20 seconds.

Find and break the ground loop behind a hum, then hear the hum already recorded notched out.

Learn what happens to typing under a voice, and turn one keystroke down in the editor.

Learn why the try leaves mouth clicks, and how the editor's Clicks button redraws them.

See how the editor filters the thump of a p or b, and what an October 3 test measured.

See how the editor turns harsh s sounds down by up to 6 dB, never removing them.

See how the editor's Rebalance turns music down under a voice, and what was measured.

Turn one cough, bark or door slam down with a box on the spectrum in the editor.

Save a voicemail from an iPhone or Android phone as an audio file, even with no save button, then check it.

Get a voice memo off an iPhone or Android phone, then check it for hum, clipped peaks and holes of silence.

Find the file Zoom, Teams or Meet saved, and check it for noise, hum and clipping.

Check a podcast track for USB interface hum, clipped peaks and room noise before you edit it.

Check a class for projector noise, hum, echo and chatter, and split a long one.

Check a sermon for hum from the desk, hall echo and noise, before the weekly upload.

Check a recorded call or interview for a narrow phone line, holes and noise.

Check the vows and speeches for wind, hum and clipping, with the picture kept.

Check each speaker's track for noise, hum, holes and clipping.

Check a chapter for room noise and hum, then read it against ACX's numbers.

Check a copy of a hearing or deposition, with the original kept as it was.

Check an interview and keep the original as the preservation copy.

Check a take for room noise and hum, then match the client's brief.

Check a recording before it is transcribed, and keep both copies.

Check a cassette or answering machine tape you captured for hum, hiss, clipping and gaps.

Capture an open reel at the right speed, then check it for hum, hiss and gaps.

Get recordings off a MiniDisc, then check them for noise, hum and clipping.

Check a voice recorder's file, WMA included, for noise, hum and a narrow band.

Check an old broadcast for disc crackle, tape hiss and an AM station's narrow band.

Check a receiver's recorded sound for band noise, static and its narrow band.

Check a sound film transfer for stripe hiss, projector hum and gaps.

Check the microphone in a stream or screen recording for noise, hum and clipping.

Find the file your computer saved, and check its narration.

Learn why earbuds record muffled sound, and hear its treble rebuilt.

Check a lapel mic recording for wireless dropouts, noise and clipping.

Check a dashcam clip for road rumble, the car's fan and wind.

Check a doorbell or camera clip's sound for wind, noise and a narrow band.

Learn which repairs keep a recording's ambience, and check its hum and clipping.

Check a phone vlog for wind, street noise and echo before you upload it.

Turn an M4A file, such as an iPhone voice memo, into an MP3 or WAV.

Turn a WhatsApp voice note, or another Opus or OGG file, into an MP3 or WAV.

Save the sound of your own video as an MP3 or WAV, taken from its first audio track.

Convert a WAV or FLAC file to an MP3 at 128 to 320 kbps, with its peaks and loudness shown before you encode.

Decode an MP3 to a 16-bit WAV at 44.1 or 48 kHz for an editor or an upload form.

Turn FLAC, 3GP, OGA and other files your browser opens into MP3 or WAV, and see which browsers open each format.

Change a recording's sample rate to 48, 44.1, 32, 22.05, 16 or 8 kHz, and save it as a WAV or MP3.

Type the size you need, such as an email limit, and get an MP3 at the highest bitrate that fits.

Write a WAV as 16-bit, 24-bit or 32-bit float, with dither going down to 16-bit.

Cut a recording to the part you keep, with a fade of up to 5 seconds at either end.

Join two or more recordings into one MP3 or WAV, in the order you set, with a gap or a crossfade between them.

Split a long recording into parts at equal lengths, at times you type or at long pauses.

Cut every pause longer than a length you choose down to a short gap, and see each one listed with its time.

Set a recording to -14, -16 or -23 LUFS, or a target you type, with one gain for the whole file.

Fold stereo to mono, copy mono to both channels, or give a recording that plays in one ear to both.

Cut up to 30 seconds of a memo, voicemail or song into an MP3 or M4R, with the steps to set it as a ringtone.

Play a whole recording, or one part of it, backwards, and save it as an MP3 or WAV.

Draw a recording's waveform as a picture in your own style, colours and size, and save a PNG or SVG.

Add fades of up to 30 seconds at each end, on a straight, smooth or equal power curve.

Save the left and right channels of a recording as two mono files.

Put up to 60 seconds of silence before or after a recording.

Repeat a recording or a part of it up to 50 times, with a crossfade at each join.

Measure each channel's offset from zero and take it out.

Find a stereo channel that is upside down, and turn it over.

Cut the rumble below 60 to 150 Hz, gently or steeply.

Quiet the pauses between words, and keep the recording's length.

Raise or lower the bass, middle and treble by up to 12 dB.

Raise quiet passages and lower loud ones, with the peaks held under -1 dBFS.

Speed a recording up or slow it down, keeping its pitch or like a tape.

Record your voice with a live level meter and save it as WAV or MP3. The recording stays in the tab until you download it.

Measure loudness in LUFS, true peak, RMS and noise floor, with a verdict for ACX, Apple Podcasts and Spotify.

See a file's spectrogram and where its sound stops, with a plain reading of what that cutoff usually means, such as a 128 kbps MP3.

See where a Suno song's treble stops and whether it clips, and learn if the trouble is in the file or in the song.

Read the codec, sample rate, bit depth, bitrate and tags of an audio or video file, and copy the report as text.

Enlarge your own video to twice its width and height and sharpen it, on your graphics chip in Chrome or Edge.

Enlarge a photo or drawing to twice its width and height and sharpen it, on your graphics chip, then save it as a PNG.

Double the width and height of a camcorder or VHS transfer, and check its sound for hum and background noise.

Sharpen a soft video at its own size, with more contrast along every edge.

Re-encode a video as H.264 in MP4 to fit a size you type.

Cut the start and end off a video, copied from a keyframe or re-encoded to the frame.

Convert an iPhone or Mac MOV to MP4 with the picture copied.

Copy an MKV's picture into an MP4 without re-encoding it, with the sound track you pick.

Convert a WebM screen recording to H.264 and AAC, or copy its VP9 and Opus into an MP4 as they are.

Replace a video's sound with an audio file, or add sound to a silent clip, with the picture copied.

Save a copy of a video with no sound track and the same picture.

Make a video's sound louder with a limiter, and keep its picture as it is.

Turn a recording and one still picture into an MP4 at 1280 x 720 or 1920 x 1080.