Is my audio file uploaded to a server for trimming?

No. Audio trimming is performed entirely in your browser using FFmpeg.wasm, a WebAssembly port of the FFmpeg library that runs locally. Your audio file is processed in browser memory and the trimmed output is downloaded directly to your device without any network transmission.

Does trimming reduce audio quality?

For WAV and lossless formats, trimming is fully lossless. For MP3 files, FFmpeg.wasm uses stream-copy mode where possible, which avoids re-encoding and preserves the original bitrate and codec quality. The trim point will snap to the nearest audio keyframe, which may result in up to half a second of variance from the exact timestamp for MP3.

How precisely can I set the trim start and end points?

Timestamps are entered in HH:MM:SS or HH:MM:SS.mmm format, allowing millisecond precision. For MP3 files, actual cut precision is limited to keyframe boundaries (typically every 0.026 seconds per frame). WAV and FLAC files support exact sample-level precision due to their non-compressed frame structure.

Is there a maximum file size or duration limit for trimming?

There is no enforced size limit, but browser memory availability is the practical constraint. Very long or high-bitrate audio files (such as multi-hour WAV recordings) may require significant memory. If the browser tab becomes unresponsive, try working with a shorter segment by using the split tool first.

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FreeNo Upload

Audio Trimmer

Trim audio files by selecting start and end times. Download as WAV. No upload.

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audio_file

Drag & drop or click to upload

Drop your audio file here

How to Use

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Upload your audio file

Select an audio file (MP3, WAV, OGG, AAC, FLAC) to trim. The waveform visualizes your audio so you can see exactly where to cut.

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Set trim points

Drag the start and end handles on the waveform to select the portion to keep. Preview the trimmed segment before committing to ensure it sounds right.

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Trim and download

Click Trim to cut your audio to the selected range. Download the trimmed file — perfect for ringtones, podcast clips, and removing unwanted sections.

What is Audio Trimmer?

Audio trim tool lets you cut an audio file to a precise start and end timestamp, removing unwanted silence, intros, or outros with sample-accurate control. It supports MP3, WAV, OGG, and FLAC formats, processing everything locally in the browser via FFmpeg.wasm. Podcasters, musicians, and content creators use audio trimming to clean up recordings without launching a full digital audio workstation.

Why use Audio Trimmer?

FFmpeg.wasm performs the same lossless stream copy that professional FFmpeg command-line users rely on, meaning audio quality is not degraded during trimming. Because no audio data leaves your device, private voice memos, confidential interviews, and unreleased music remain fully secure. The fast browser-based processing handles even lengthy files without requiring a server-side queue.

lockComplete privacy — Your files never leave your device or browser.
boltInstant processing — No wait times, no server queues, no upload delays.
money_off100% free — No subscriptions, no credits, no hidden fees.
person_offNo registration — Start using immediately, no account needed.
devicesWorks everywhere — Any modern browser on desktop, tablet, or mobile.

How it works

A podcaster trims a 10-second pre-recording silence from the start and a rambling outro from the end of an episode before publishing. A musician clips the best 30-second section from a practice recording to share as a social media reel. A language teacher extracts a specific dialogue segment from a longer lesson audio file to use as a standalone listening exercise.

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Pro Tip

When trimming MP3 files, FFmpeg.wasm uses stream-copy mode by default which preserves original codec quality without re-encoding — the trim point will snap to the nearest keyframe, so allow up to half a second of margin if exact frame-level precision is critical. For precise to-the-millisecond cuts, use WAV source files which have no keyframe constraints.

Frequently Asked Questions

The tool supports MP3, WAV, OGG, and FLAC — the four most widely used audio formats for both consumer and professional applications. These formats cover the vast majority of audio files from smartphones, recording software, digital audio workstations, and online sources.

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