Bring a recording to a standard loudness, such as -16 LUFS for podcasts, and see the measured before and after.
Files up to 100 MB and 60 minutes long.
Your file is deleted from our server as soon as the result is made, and the result 15 minutes later.
Add your file to begin. The result shows here.
Studio edits the whole video episode: retakes and pauses out, captions in, clips made.
The Studio free plan takes recordings up to 2 GB and edits the whole thing: retakes and pauses out, captions in.
Peak level is the single loudest instant in a file. Loudness, measured in LUFS, is how loud the whole thing sounds to a listener. Two recordings can peak at the same level and one can still sound twice as loud. Platforms judge by loudness, so that is what this tool sets.
Apple's podcast requirements ask for about −16 LKFS (the same unit as LUFS), within one decibel either way, with peaks no higher than −1 dB. Spotify plays music back at −14 LUFS and advises keeping peaks below −1 dB. European broadcast uses −23 LUFS under the EBU R 128 recommendation. If you are unsure, −16 suits spoken audio.
The tool measures the file with the EBU R 128 method, works out one gain change for the whole file, applies it and holds the peaks under the limit you chose. If the loudest peaks would be pushed past that limit, they are gently compressed first. Then the result is measured, and those are the numbers you see.
Loudness Units relative to Full Scale: a measure of perceived loudness averaged over a whole recording. A higher number, such as −14, is louder than a lower one, such as −23.
No. The whole file moves up or down together. Level each speaker's track separately before mixing them, then normalize the mix.
No. Sound that clipped when it was recorded stays clipped. Normalizing only changes how loud it is.
The adjustment is one gain change with a peak limit, so it lands within a few tenths of the target. Apple's guidance allows one decibel either way.
Extract the sound, normalize it, and put it back with add audio to video.
Reduce steady background noise such as hiss, hum and fan sound, then compare with the original.
Convert audio between MP3, WAV, M4A, FLAC and OGG, with bitrate, sample rate and mono or stereo.
Turn a podcast or song into a video by adding a cover image, with an optional moving waveform.
Turn up to 5 minutes of speech into text and captions, in 17 languages, ready to copy or download.
Use light cleanup for a steady background. Compare consonants and pauses; stop when the voice loses more than the noise.
Read the guide Guide · AudioUse programme loudness for consistency and true peak for headroom. Check the measured export; a louder file is not automatically a better one.
Read the guideUpload the raw recording. Studio cuts the ums, retakes and long pauses, adds captions and makes short clips. 30 free minutes, no card.