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Need just the chorus, one quote from an interview or the first ten seconds of a voice memo? Drop the file in, drag across its waveform, listen to the selection and save the clip in the format you need. Everything happens inside your browser tab.
Processing locally on your device
Overview
When you open a file, the cutter decodes it with the Web Audio API, using the codecs your browser already has. MP3, WAV, M4A/AAC, OGG and FLAC open everywhere; Opus and some less common formats depend on the browser. Video files work too: the cutter reads the soundtrack, so you can pull a line of dialogue or a music bed out of an MP4 without a separate extraction step.
The decoded audio is drawn as a waveform. Loud passages appear as tall peaks and silence as a flat line, which makes it easy to see where a sentence starts or a beat drops. Drag across the waveform to select, pull the handles to adjust, or type exact times such as 1:23.45 when you need to land between two words. Clicking the waveform moves the playhead, and the Start at playhead and End at playhead buttons turn whatever you just heard into a cut point.
Fade in and fade out sliders (up to 10 seconds each) shape the start and end of the clip, and the fade is drawn on top of the waveform so you can see how far the volume drops. The preview plays the selection through the same processing used for the export, so what you hear is what you download. The clip is rendered with an OfflineAudioContext, which runs much faster than real time.
Choose the output format to suit the job. WAV is written directly in JavaScript, so it is instant and lossless, but large: about 10 MB per stereo minute at 44.1 kHz. MP3, M4A (AAC), OGG, Opus and FLAC are encoded with FFmpeg compiled to WebAssembly. The first such export downloads the engine once (about 31 MB); after that it is cached and works offline. A 30-second MP3 at 192 kbps is roughly 0.7 MB.
| Format | Setting | Size per minute | Best for |
|---|---|---|---|
| MP3 | 192 kbps | 1.4 MB | Sharing, any player |
| M4A (AAC) | 160 kbps | 1.2 MB | Apple devices, video editors |
| Opus | 96 kbps | 0.7 MB | Voice, messaging |
| FLAC | Lossless | 5–7 MB | Archiving, further editing |
| WAV | 16-bit, 44.1 kHz | 10.6 MB | DAWs, samplers, instant export |
Open an audio file, or a video whose soundtrack you want to cut.
Drag across the waveform to select the part to keep, then adjust the handles.
Fine-tune the start and end by typing times, or set them from the playhead.
Add a fade in or fade out if the clip should start or end smoothly.
Click Play selection to check it, pick an output format and bitrate, then click Cut audio and download.
Use cases
Pull a 30-second highlight from a long episode to post as a teaser. The waveform shows the natural pauses, so the clip doesn’t start or end mid-word.
Isolate a single drum hit, door slam or vocal phrase and save it as WAV or FLAC, the lossless formats most samplers, DAWs and game engines prefer.
Open the MP4 of a meeting or lecture and keep only the few minutes you need for notes or transcription, saved as a small M4A or MP3.
Shorten a music track to match a slideshow or video and add a few seconds of fade out so it ends cleanly instead of stopping abruptly.
Pro tips
Answers to common questions about the audio cutter.
MP3 plays everywhere and is the safe default. M4A (AAC) is slightly smaller for the same quality and suits Apple devices. Opus gives the best quality per byte for voice. WAV and FLAC are lossless, best when the clip is going into another editor.
Yes. Open the video file and the cutter decodes its soundtrack into a waveform. Whatever you select is exported as an audio file; the picture is not included.
Exporting to MP3 again means a second round of lossy encoding. At 192 kbps or more the difference is very hard to hear. Saving as WAV or FLAC avoids any further loss, at the cost of a larger file.
Compressed formats are encoded with FFmpeg running as WebAssembly in your browser. The first export downloads that engine, about 31 MB; it’s cached afterwards, so later exports start immediately, even offline. WAV export doesn’t need it.
The cutter relies on the decoders built into your browser. Common formats work everywhere, but some Opus, OGG or unusual codecs inside video containers may not decode in every browser. Trying another browser usually solves it.
No. ToolEnhancer processes files on your own device inside the browser. They are never sent to, stored on or seen by our servers.
Yes. The audio cutter is free to use with no sign-up, no watermarks and no daily limits.