# Audio Trimmer

> To trim an audio file online, load it into the tool above, drag the start and end handles on the waveform (or type the times), press Preview, then Download WAV. The cut runs in your browser, so the file is never uploaded. It's free with no account. Files can be up to 60 MB, about an hour of 128 kbps MP3, and the download is always a WAV, not an MP3.

URL: https://kenerateai.com/audio-trimmer
Publisher: Kenerate AI (https://kenerateai.com)
Last updated: 4 November 2026

## Key facts
- Opens: MP3, WAV, M4A, OGG (what your browser decodes)
- File limit: 60 MB (about 1 hour of 128 kbps MP3)
- Download: 16-bit WAV, stereo or mono
- Fades: 0–10 s in and out, linear
- Precision: 0.1 s by keyboard, typed times to 0.01 s
- Shortest clip: 0.1 seconds
- Privacy: Processed on your device
- Cost: Free, no account, no watermark
- Demo "Crate Digger" (Boom-bap, MiniMax Music 3.0): prompt: Classic boom-bap hip-hop beat, dusty kick and snare, chopped soul sample, deep bass, head-nod groove, 90 bpm
- Demo "Rio Afternoon" (Bossa nova, Ken Music 1.5): prompt: Bossa nova, nylon-string guitar, soft brushes, flute melody, warm and breezy, Rio beach afternoon, 124 bpm
- Demo "Hands Up" (EDM, MiniMax Music 3.0): prompt: Big-room EDM festival track, huge build-up, massive drop with punchy kick and lead synth, crowd energy, 128 bpm

## Steps
1. Choose a file — MP3, WAV, M4A or OGG, up to 60 MB. It opens on your device.
2. Set the start and end — Drag the handles on the waveform, or type the times in seconds.
3. Add fades if you want them — Fade in and fade out each run up to 10 seconds.
4. Preview the clip — Preview plays the clip with its fades. Last 3 s checks the ending.
5. Download the WAV — The clip saves as a new file. Your original isn't changed.

## In depth

### What happens to your file
When you choose a file, the browser reads it from your disk and decodes it into raw audio in memory, using the Web Audio API [1]. The waveform, preview and export all work from that decoded copy. No part of it is sent anywhere, and closing the tab clears it.
Decoding is also why there is a size limit. The tool holds uncompressed audio in memory, so a small MP3 can become a very large buffer: an hour of stereo takes well over 1 GB as decoded samples. The tool stops at 60 MB for that reason.

### How long big files take
We timed the tool on 4 November 2026 in Edge on one Windows desktop, using generated test tones. Your times will differ, and we haven't measured phones or other browsers.
- One-hour MP3, 57.6 MB at 128 kbps — opened in 4.6 seconds. Exporting almost all of it took 3.4 seconds and made a 634.6 MB WAV.
- 5 minute 40 second WAV, 60 MB — opened in 0.3 seconds and exported in 0.4 seconds.
- Anything over 60 MB — refused with a message, before it's read.

### Why the download is a WAV
Browsers can decode MP3 but don't come with a way to write one, so an MP3 export would need an extra encoder inside the page. This tool doesn't have one, and it won't pretend to. WAV is plain uncompressed audio, which also means your cut isn't compressed a second time.
The catch is size: about 10.6 MB per minute for stereo at 44.1 kHz. That's fine for short clips, and the tool shows the size before you download.

### Picking a clip length
Common lengths, and a button to start from:
- 15 seconds — a short social clip or a voicemail greeting.
- 30 seconds — a ringtone. Apple's iPhone limit is 30 seconds [2].
- 60 seconds — a longer social clip or a sample to send someone.

References:
[1] MDN — BaseAudioContext.decodeAudioData(): https://developer.mozilla.org/en-US/docs/Web/API/BaseAudioContext/decodeAudioData
[2] Create a custom ringtone on your iPhone — Apple Support: https://support.apple.com/en-us/120692

## FAQ
Q: How do I trim an audio file for free?
A: Load it into the trimmer at the top of this page, set the start and end, then press Download WAV. It's free, with no account and no watermark.

Q: Is my audio uploaded?
A: No. Your browser decodes the file and cuts it on your device, so the audio never reaches our servers.

Q: Can I download the trimmed clip as an MP3?
A: No, not here. The trimmer only exports WAV, because browsers don't include an MP3 encoder and this tool doesn't add one. If you need an MP3, open the WAV in our M4A to MP3 converter, which reads WAV files up to 60 MB.

Q: Does trimming reduce the quality?
A: The kept part isn't compressed again, because WAV is uncompressed. It's saved at 16-bit, and at your browser's audio rate, which is often 44.1 or 48 kHz. An MP3 opened here won't gain quality from becoming a WAV, though: it just becomes a bigger file.

Q: Why is my trimmed WAV bigger than the original MP3?
A: WAV is uncompressed. A stereo clip at 44.1 kHz takes about 10.6 MB per minute, while a 128 kbps MP3 takes about 1 MB per minute.

Q: What formats can it open?
A: MP3, WAV, M4A and OGG usually work. The browser does the decoding, so what opens depends on the browser you use. For audio inside a video, use the extract audio from video tool first.

Q: Can I use it as an MP3 cutter or audio cutter?
A: Yes for the cutting: an MP3 opens fine and you can cut any part of it. The result downloads as a WAV rather than an MP3.

Q: How do I cut a ringtone from a song?
A: Press 30 s clip to set a 30-second selection, move the handles to the part you want, add a short fade out and download. Apple's limit for iPhone ringtones is 30 seconds. Use only audio you have the right to use.

Q: How big a file can I trim?
A: Up to 60 MB. On a Windows desktop in Edge, a one-hour 128 kbps MP3 of 57.6 MB opened in about 5 seconds. We haven't measured phones, which have less memory, so long files may fail there. If one does, try a shorter file.

Q: Can I remove a section from the middle?
A: No. This tool keeps one continuous section, from the start handle to the end handle. To join two parts, use an audio editor such as Audacity.

## Related pages
- Ringtone maker: https://kenerateai.com/ringtone-maker
- Extract audio from video: https://kenerateai.com/extract-audio-from-video
- M4A to WAV: https://kenerateai.com/m4a-to-wav
- MP3 to WAV converter: https://kenerateai.com/mp3-to-wav
- WAV to MP3 converter: https://kenerateai.com/wav-to-mp3
- M4A to MP3 converter: https://kenerateai.com/m4a-to-mp3
- Reverse audio: https://kenerateai.com/reverse-audio
- BPM changer: https://kenerateai.com/bpm-changer
- Slowed + reverb maker: https://kenerateai.com/slowed-reverb-maker
- AI music generator: https://kenerateai.com/ai-music-generator

## Sources
- MDN — Web Audio API: https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API