Audio Trimmer

Keep only the part of a track you need. Drag the start and end markers over the waveform and export a clean clip in seconds.

How to use the Audio Trimmer

  1. Add your audioDrop a file onto the page or tap to browse — or press “try a built-in sample” to explore first. Nothing is uploaded; the file is decoded on your device.
  2. Select what to keepDrag the two handles on the waveform, or type start and end times. The area outside the highlight will be removed.
  3. Trim and comparePress Trim to selection. Short fades on both ends prevent pops; use the Original/Result switch to check the new start and end.
  4. DownloadPick MP3 or WAV and press Download. You can even listen to the exact file you just saved before you close the page.

About the Audio Trimmer

The Audio Trimmer keeps one stretch of a recording and discards everything before and after it. It is the right tool for shortening a clip to the good part: chopping dead air off a voice memo, extracting a chorus, preparing a sample, or making a clip fit a platform’s length limit.

Handles can be dragged on a live waveform, nudged with the arrow keys (±10 ms, hold Shift for ±100 ms) or typed in as exact timestamps, and Selection only playback lets you hear precisely the section that will survive, with looping if you want to fine-tune the end point.

How the Audio Trimmer works

Trimming copies the samples between the two markers into a new buffer and applies a short fade at each end (2–5 ms by default; up to 500 ms if you want a deliberate fade-in or fade-out). Markers can snap to the nearest zero-crossing so the new first and last samples start and end at silence, which keeps the clip free of clicks when it is looped, concatenated or played by a sampler.

No re-encoding happens until you download, so repeated trimming of the same source does not stack up generation loss.

What people use it for

Voice memos & notes

Strip the fumbling before and after you start talking.

Samples & loops

Grab a 2-bar phrase from a longer recording for a sampler or DAW.

Ringtones & alerts

Cut a 10–30 second highlight for a phone alert.

Platform limits

Shorten audio to meet upload limits such as 60-second previews or 3-minute demos.

Tips for the best results

  • Hold Shift with the arrow keys on a focused handle for 100 ms steps; hold Alt for 1 ms.
  • Loop the selection (Loop button) and nudge the end marker until the loop point feels musical.
  • If the clip needs a gentle ending, raise “Edge fades” to 200–500 ms.
  • For automatic trimming of silence at the start and end, try the Trim Silence tool.

Common problems & fixes

The trimmed file starts with a tiny delayThat is the encoder’s priming delay for MP3 (about 25 ms). Export WAV for sample-exact starts.
Handles will not move preciselyZoom in or type the time directly into the Start/End boxes.
The end is cut mid-wordExtend the end marker slightly into silence and add a 100–200 ms edge fade.

Quick facts

MethodKeep-range copy with edge fades
Fade range0–500 ms
Marker resolutionSample-accurate; typed times to 10 ms
Bit depth while editing32-bit float

Frequently asked questions

Can I trim by typing timestamps?

Yes — the Start and End boxes accept m:ss.ms or plain seconds.

Will trimming change the pitch or speed?

No. Only the length changes.

How accurate is it?

Edits are sample-accurate; the displayed times are rounded to 10 ms.

Will trimming lower the audio quality?

No. If you export as WAV there's no quality loss at all. MP3 export uses a standard 192kbps encode, which is transparent for almost all listening.

Is there a length limit?

No hard limit is enforced by ToolsCrow — the practical limit is your device's memory, since the whole file is decoded locally.

Can I use this for a ringtone?

Yes — trim the section you want, export as MP3, then set it as your ringtone using your phone's normal settings.

Your audio never leaves your device

This tool runs entirely in your browser using the Web Audio API. Nothing is uploaded, stored or shared — there is no server to send your file to, so it works offline once the page has loaded.

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