toolkitta.
Local file processing

Audio Editor

Arrange music, speech and voiceovers on a multitrack timeline. Split, trim, slip, fade and mix your audio, then reuse your arrangement in a workflow.

Your files stay on your device

Open media or project

About project filesProjects include original source files (including video), their metadata and editable tracks. Files stay on your device.

Start from scratch

Record a voiceover

Record on this device, then trim, mix and fade it.

Empty timeline

Set up your tracks, then bring in your media.

Recording asks for microphone permission when you press the button. Everything you add stays on this device.

How it works

How to edit audio on the timeline

  1. Open or record

    Drop in audio or video, reopen a saved project, or record a voiceover. Only the sound from videos is used.

    Files stay on your device

  2. Arrange your tracks

    Drag clips to move them, trim either edge, split at the playhead and overlap clips across tracks.

    Up to 20 tracks and 200 clips

  3. Shape the sound

    Adjust volume and fades, change speed and pitch, reduce background noise or snap cuts to beat markers. Undo as you go.

    Keep your original audio

  4. Save your mix

    Export MP3, WAV, M4A or FLAC, save a project to keep editing, or export a recipe for a workflow.

    Audio, projects and recipes
Inside the editor

Everything you need for your mix

Switch between clips and tracks without losing your undo history. Everything plays through the same mix you export.

Timeline & tracks

Room for every sound

Stack up to 20 tracks and overlap clips. Mute, solo, lock and set the volume of each track, and pinch or slide to zoom.

  • Multitrack
  • Mute & solo
  • Zoom
Clip editing

Cut exactly where you mean

Split at the playhead, trim either edge, slip the source inside a clip, and copy, paste or duplicate clips.

  • Split & trim
  • Slip
  • Duplicate
Sound

Shape every clip

Set clip volume and fades, change speed and pitch, and reduce steady background noise under Voice.

  • Fades
  • Speed & pitch
  • Noise reduction
Voice & music

Record and keep time

Record a voiceover while your project plays along, and snap cuts to beat markers detected in music.

  • Voiceover
  • Play-along
  • Beat markers
Shortcuts

A familiar rhythm for editing

Press S to split and Space to play. Undo with Ctrl/Cmd + Z, and duplicate a clip with Ctrl/Cmd + D.

  • S · Split
  • Space · Play
  • Ctrl/Cmd + Z
On your device

Your audio stays local

Audio is decoded and mixed in this browser. Save a portable project when you want to keep the original files and every edit.

  • Local processing
  • No audio uploads
  • Save project
Try a split and close the gap

Download the 40-second synthetic WAV and add it to an empty timeline. Select its clip, set Playhead to 10 seconds and choose Split.

Select the first, ten-second clip and choose Delete and close gap from its clip menu. The remaining 30 seconds should start at zero. Play it, then export WAV. Save a project as well if you want to reopen the sources and editable clips; the WAV contains the rendered mix.

Frequently asked questions

Useful details

8 answers
Can I edit more than one audio track?

Yes. Add tracks, overlap clips and control each track’s volume, mute, solo and lock. Moving and deleting clips leave other clips in place.

What does Slip do?

Slip changes the source audio heard inside a clip while keeping the clip’s position and duration. Use the More panel for exact timing.

Can this run in a workflow?

Yes. Audio Editor is available in Step-by-step and Advanced workflows. Sequence mode joins the current sources; a custom recipe repeats your timing, mixing and effects with files bound in source order.

What is stored in a project?

An explicitly saved project includes original source files (including the full video when imported), their metadata and editable settings. A workflow recipe contains only settings and generic source slots. Nothing is saved automatically.

How does voice recording work?

Record voiceover asks for microphone permission when you press the button. By default the project plays from the playhead while you record, so you can speak in time with it; use headphones so the playback is not recorded. Stop adds the local recording on the selected track, lined up with what you heard; Cancel discards it.

How does background noise reduction work?

Voice › Reduce background noise learns the steady noise in a clip, such as hiss, hum or a fan, and lowers it along with low rumble. It runs on your device without an AI model, works best on speech recorded in one place and cannot remove music, echo or other voices.

What are beat markers?

For music with a steady beat, Beats › Show beat markers detects the beat on your device and marks it on the clip. Moving clips, trimming edges and placing the playhead snap to the markers; hold Alt to place freely. Speech or free-time audio may show no beat.

Which formats can I export?

MP3, WAV, M4A and FLAC, plus M4R for compositions up to 40 seconds. Exports use 48 kHz stereo and omit original metadata. Supported imports depend on your browser’s decoders.

More help

Guides, common conversions and useful next steps.

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