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 — spots where the volume stays low for a set amount of time — and uses those as cut points. You can adjust how quiet and how long in the settings.

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 encodes all segments to your chosen format and packages them into a ZIP file that downloads to your device. Each file is named with a sequential number (segment-01.mp3, segment-02.mp3, etc.).

Auto-Cut is an enhanced automatic segmentation feature available for audio files 8 minutes or longer. It uses the same silence-detection algorithm but with a streamlined interface and improved defaults tuned for long recordings like band rehearsals and lectures. 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 set limit — it depends on your device's available RAM and browser memory. In practice, most devices handle files up to 500 MB comfortably. Recordings longer than 3 hours or files larger than 1 GB may cause performance issues or browser crashes on devices with limited RAM. 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.

Open the settings panel and adjust the silence threshold and minimum silence duration. If too many segments were detected, raise the silence threshold (so only deeper silences are treated as gaps) or increase the minimum silence duration. If too few were detected, lower the threshold or reduce the minimum duration. You can re-run detection as many times as needed after adjusting the parameters.

Check that your browser is not blocking downloads. In Chrome, look for a blocked download notification in the address bar. In Safari on iOS, files are previewed in the browser rather than downloaded — 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.