ToolZool

Audio Lab

One place for every tool in ⁨Audio Lab⁩.

Trim, level and inspect sound.

⁨10⁩ free toolsNo sign-up requiredWorks on any deviceYour files stay with you

Explore ⁨Audio Lab⁩ below and find the right tool for your task.

Tools in ⁨Audio Lab⁩

⁨0⁩ tools · ⁨10⁩ planned

Grouped by the job you came to do. ⁨0⁩ are live now; the rest are in build and marked Soon.

Convert & export

Move between formats, both directions.1 tool
Extract audio from videoSoonPull the soundtrack out of a video without uploading the video.MP4 · WEBM · MOV

Edit & level

Cut, join and balance the sound.⁨6⁩ tools
Trim audioSoonCut to a start and end point, exact to the millisecond.AUDIONormalize audioSoonBring the loudest peak to a target level without clipping anything.AUDIOVolume changerSoonRaise or lower the level by a set amount, with clipping reported honestly.AUDIOSilence removerSoonStrip the dead air from the start and end of a recording.AUDIOSample rate converterSoonMove between 48 kHz, 44.1 kHz and lower rates for voice.AUDIOMerge audioSoonJoin clips end to end in the order you drop them, with an optional crossfade.AUDIO

Read & inspect

See what a file actually contains.⁨2⁩ tools
Waveform generatorSoonA clean waveform image from any audio file, sized for a post or a player.MP3 · WAV · M4A · OGGAudio file inspectorSoonDuration, channels, sample rate, peak level and the real bitrate.MP3 · WAV · M4A · OGG

Work it out

Answers with the working shown.1 tool
Audio size calculatorSoonWhat a recording will weigh at a given bitrate, length and channel count.MATH
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About ⁨Audio tools⁩

Why does everything come out as WAV?

Because WAV is the one format a browser can write losslessly without an external encoder. It is bigger than MP3 but nothing is thrown away, which is what you want in the middle of an edit.

Is there a length limit?

Decoding holds the whole file in memory as 32-bit samples, so an hour of stereo is roughly 700 MB of RAM. A few minutes is comfortable; a podcast episode will be slow.

Can I extract audio from a video?

Yes. The same decoder handles the audio track of MP4, WebM and MOV files, so you get a WAV of the soundtrack without uploading the video.

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