A waveform audio editor that runs entirely in your browser. Open an MP3, WAV, M4A or FLAC file, zoom in to the sample, select one or several regions, then cut, copy, paste, fade, normalize or add effects. Every step is in the undo history, and you can export the result as MP3 or WAV.
Last updated:
demo.wav
0:00.000
Drop to open
Length0:00.000
Regionsnone
Edit
Clipboard empty.
Volume
dB
Effects
Markers
History
Export
Shortcuts: Space play/pause · click cursor · drag select · Ctrl/⌘+drag add region · Shift+click extend · Ctrl+wheel zoom · Ctrl+Z / Ctrl+Y undo/redo · Ctrl+X/C/V · Delete · Ctrl+A · M marker · L loop
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How to use the Online Audio Editor
Open your audio: click Open audio file or drop a file on the waveform. A short demo clip is loaded so you can try everything first.
Select: drag across the waveform. Hold Ctrl (⌘ on Mac) while dragging to add more regions, Shift-click to extend, or type exact start and end times.
Edit: use Cut, Copy, Paste, Delete, Crop, fades, Normalize, Amplify or an effect. Without a selection, volume tools and effects apply to the whole file.
Check and undo: press Space to play the selection, use ↶ / ↷ or click any step in the History list to go back.
Export: pick MP3 or WAV and press Download audio (tick Export selection only to save just the selected part).
Editing operations and what they change
Tool
Changes the length?
Without a selection
Typical use
Cut / Delete
Yes, shorter
Needs a selection
Remove coughs, mistakes, long pauses
Paste
Yes, longer (or replaces one selected region)
Inserts at the cursor
Repeat a chorus, move a sentence
Crop to selection
Yes, keeps only the selection
Needs a selection
Make a clip or ringtone
Silence
No
Needs a selection
Mute a click or a name without shifting timing
Fade in / out
No
First / last 2 seconds
Smooth starts and endings
Normalize / Amplify
No
Whole file
Make a recording louder or match levels
Speed change
Yes
Whole file
Slow down a lesson, speed up a voice note
Echo, filters, bass boost, reverse
No
Whole file
Creative effects and cleanup
Decibels and gain
Digital audio is measured in dBFS (decibels relative to full scale): 0 dBFS is the loudest value a file can store and anything above it clips. A gain change in dB converts to a multiplier with factor = 10dB/20.
Gain
Amplitude factor
Perceived change
+6 dB
×2.0
Clearly louder
+3 dB
×1.41
Noticeably louder
+1 dB
×1.12
Just noticeable
-6 dB
×0.5
Clearly quieter
-20 dB
×0.1
Background level
Tips for clean edits
Cut at quiet points. Zoom in until you see individual waves and place cuts where the waveform crosses the centre line; that avoids clicks.
Use very short fades (10 to 20 ms) on both sides of a cut in music to hide any remaining click.
Normalize last. Effects such as echo and bass boost can raise peaks above 0 dBFS; normalizing at the end brings the peak back to -1 dB.
Use markers to note spots while listening (press M during playback), then jump back to edit them.
Keep a WAV master if you plan more edits later; every MP3 export loses a little quality.
Frequently asked questions
Is this online audio editor really free and private?
Yes. It is free with no sign-up, no watermark and no time limit. Audio is decoded and edited in your browser's memory with the Web Audio API; nothing is uploaded. Only the MP3 encoder (LAME, about 150 KB) is downloaded from a CDN when you export MP3.
How do I cut out part of a song?
Drag across the part you want to remove, check it by pressing Space, then press Delete (or Cut to keep it on the clipboard). The audio after it moves up to close the gap. To keep only a part instead, select it and press Crop to selection.
Can I select several parts at once?
Yes. Hold Ctrl (or ⌘ on a Mac) and drag to add more regions. Delete, Cut, Silence, fades, Normalize, Amplify and effects then apply to every region, and Copy joins them in order on the clipboard.
What does Normalize to -1 dB do?
It finds the loudest sample (peak) in the selection or file and applies one gain so that the peak becomes -1 dBFS: gain in dB = -1 - peak dB. The relative loudness of quiet and loud passages is unchanged. -1 dB leaves headroom so MP3 encoding does not clip.
How many undo steps are there?
Every edit is kept in the History list and you can jump to any step. Each step stores a copy of the changed audio, so for very long files the oldest steps are dropped automatically after about 700 MB of history to keep the browser responsive.
Which formats can I open and export?
You can open anything your browser can decode: MP3, WAV, M4A/AAC, FLAC, OGG Vorbis, Opus and WebM in all modern browsers (AIFF in Safari). Exports are MP3 at 128 to 320 kbps or uncompressed WAV at 16 or 24-bit, at the original sample rate.
Are markers saved?
Markers are kept while you edit and move with the audio when you delete or insert parts. When you export the whole file as WAV, they are written as standard cue points with labels, which most audio editors and DAWs can read.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.