Frequently Asked Questions

You can upload MP3, WAV, M4A (AAC), OGG, FLAC, AIFF, and most other audio formats supported by your browser's Web Audio API. Browser support varies slightly. MP3, WAV, and M4A work in all major browsers. FLAC and OGG may not be supported in all environments.

It looks for stretches of quiet and treats them differently based on length. Short pauses can stay inside the same part, while longer pauses become cut points. In Auto-Cut you can choose a recording-style preset, adjust how much silence stays inside a part, and set how long a pause should be before it becomes a new part.

Yes. Click and drag anywhere on the waveform to select a region, creating a new segment from that selection. You can create as many manual segments as you need, and you can mix manual and auto-detected segments in the same session.

Each segment card has precision sliders for the start time and end time. You can drag these sliders to adjust the boundaries with millisecond precision. The waveform highlights the selected segment region so you can see exactly what will be exported.

Yes. Click the play button on any segment card to preview just that segment. You can also use the spacebar shortcut: if a segment is focused, the spacebar plays and pauses that segment. The playhead on the main waveform moves in real time during playback so you can follow along visually.

Once you have two or more segments, a "Download All" button appears in the segments panel. Clicking it prepares each segment in your chosen format and downloads the files one after another to your device. If your browser asks for permission to allow multiple downloads, approve it for AudioMultiCut. You can also download each segment individually from its own card.

Auto-Cut is an enhanced automatic segmentation feature available for audio files 8 minutes or longer. It adds recording-style presets for rehearsals, lectures, podcasts, lessons, and live shows, plus controls for how much pause can stay inside one part versus how long a pause should be before a new part starts. It also enforces a time-based cap so the beta does not create an unrealistic number of segments. Because it is still being refined, it is labeled as beta.

No. Your audio file never leaves your device. All decoding, waveform rendering, segment detection, and encoding happen entirely in your browser using the Web Audio API and WebAssembly. Everything stays on your machine — there's no server involved. So confidential recordings, private lessons, sensitive interviews, all fine.

No audio content is stored or transmitted. The only data collected is anonymous usage analytics (page views, feature usage events) to help improve the tool. No personal info is collected either.

Because all processing is local, using AudioMultiCut for confidential recordings is technically safe since the content stays on your device. For copyrighted material, you are responsible for ensuring you have the right to split and use the recording. AudioMultiCut provides a tool; compliance with copyright law is the user's responsibility.

MP3 uses lossy compression to produce small files (a 3-minute segment is roughly 2–4 MB at 128 kbps) that play on any device. There is a slight reduction in audio quality compared to the original, though it is usually imperceptible for casual listening. WAV stores uncompressed audio, preserving every detail of the original recording. A 3-minute WAV is about 30 MB. If you're still going to edit the file, go with WAV. For sharing, MP3 is fine.

MP3 encoding is lossy, meaning some audio data is discarded during compression. At 128 kbps it's hard to notice the difference on most recordings. If preserving original quality is important, so if you're planning to edit further, use WAV export instead.

There's no fixed file-size limit — the real constraint is your device's available RAM and browser memory. AudioMultiCut will warn you when a recording is longer than 3 hours because large files take longer to decode and can use a lot of memory. Files over 3 hours 30 minutes are supported only on desktop browsers, and 4 hours 30 minutes is the absolute maximum. For very large files, closing other browser tabs before using AudioMultiCut will help.

This usually means the browser could not decode the audio format. Try converting the file to MP3 or WAV using a free converter and re-uploading. If the issue persists in Chrome, try Firefox or Edge — browser audio codec support varies. Also make sure the file actually plays in a normal media player.

Start by choosing the preset that matches your recording type. If there are still too many cuts, increase the split pause or the minimum part length. If there are too few, lower the split pause or choose a preset that expects shorter sections. The experimental overrides also let you decide how much silence can stay inside one part before the detector starts considering a split.

Check that your browser is not blocking downloads. If Download All seems to do nothing, your browser may be blocking multiple downloads. In Chrome, look for a blocked download notification in the address bar or open Site Settings and allow Automatic downloads for this site. Other browsers have similar download-permission settings. In Safari on iOS, files are previewed in the browser rather than downloaded, so use the share sheet to save to Files. If using a VPN or privacy extension, temporarily disabling it may help. Also ensure you have sufficient storage space on your device.