A clean excerpt begins and ends where the listener can understand it. Audio Trimmer selects a continuous interval from a source and exports it as MP3. It uses numeric timing rather than a waveform editor, so listening to the original before choosing numbers makes the result easier to control.
Plan the interval in seconds
Choose one audio file up to 50 MB. Accepted extensions include MP3, WAV, OGG, M4A, AAC, FLAC, WebM, and MP4, subject to codec support. Enter Start time at or above zero and Duration to export between 0.1 and 600 seconds.
Duration means the length of the excerpt, not its absolute end time. The requested end is start plus duration. The browser checks that the source has a finite positive duration and rejects ranges outside it. Some files require a clean export before their timing metadata can be read.
Select Process media. The output is a 192 kbps MP3 with video excluded. The tool re-encodes the selected audio rather than promising a stream-copy edit or preserving the original format.
Extract a spoken answer
Suppose a recording lasts 120 seconds and an answer runs from second 35 to second 52. Enter start 35 and duration 17. The requested end point is 35 + 17 = 52 seconds. Entering 52 as duration would request a much longer excerpt ending at second 87.
For the same recording, start 115 and duration 10 is invalid because it would reach second 125. Choose a shorter duration or an earlier start. The tool does not silently decide which part of an invalid request you meant to keep.
After export, listen to the first and last words. If either sounds clipped, give the speaker a little more context by adjusting the original interval. This workflow has no automatic silence detection or fade control, so small timing decisions remain yours.
Allow for browser limits
Processing stays in your browser using a single-thread WebAssembly engine, with a roughly 32 MB first-use download. Keep the tab open; memory use can be substantial, and execution stops after two minutes if it cannot finish. Cancel processing is available when needed.
Output can be larger than the source or change metadata and encoding characteristics. Preserve the original until the excerpt is checked. Use MP4 to MP3 when you first need a listening copy of a video soundtrack. If the excerpt is too quiet, Audio Volume Booster provides gain adjustment, followed by another listening check.