Audio Trimmer — Free Online

Cut and trim audio files in your browser. Set start and end times and export as MP3 or WAV.

ファイルは約1時間後に削除されます

Trimming audio is one of the most common editing tasks, yet it usually forces you to open a full digital audio workstation just to cut a few seconds. Whether you need to remove silence from the start of a recording, clip a sound bite to its essential few seconds, or chop a long interview down to a usable segment, you need a precise and fast tool — not a feature-heavy editor.

This browser-based trimmer lets you set exact start and end times, preview the result, and download the clipped file immediately. It works on MP3, WAV, FLAC, OGG, AAC, and more. There is nothing to install, and your audio stays on your device throughout.

How to Trim Audio Files Online

  1. 1

    Upload your audio file

    Drop any MP3, WAV, FLAC, OGG, or AAC file. Files up to 100 MB are supported.

  2. 2

    Set start and end time

    Enter the start time and end time for your clip using HH:MM:SS format.

  3. 3

    Download your trimmed audio

    Click Trim. FileCrank cuts the audio at the exact times you specified. Files are deleted within 1 hour.

How Browser-Based Audio Trimming Works

The trimmer decodes your audio file into a PCM buffer using the Web Audio API, then renders the waveform so you can see exactly what you are cutting. When you confirm the trim range, the selected PCM frames are extracted from the buffer and passed to a WebAssembly FFmpeg encoder, which re-encodes them in your chosen output format.

For lossless formats like WAV and FLAC, the extracted frames are encoded without any quality reduction. For lossy formats like MP3 or AAC, a short re-encode is unavoidable because MP3 and AAC frames are not independently seekable at arbitrary sample boundaries. The encoder is configured to match the original file's bitrate, keeping any quality difference imperceptible.

Why Use FileCrank to Trim Audio?

  • ✓ Precise trimming by start and end time using HH:MM:SS or seconds.
  • ✓ Supports MP3, WAV, FLAC, OGG, AAC, and M4A input.
  • ✓ Set only start time or only end time to trim one side.
  • ✓ No watermarks, no signup, completely free.
  • ✓ Files are processed securely and deleted within 1 hour.

機能と仕様

最大ファイルサイズ
最大100 MB
プライバシー
ファイルは約1時間後に削除されます
料金
無料、登録不要
処理方式
サーバーサイド
ファイルは1時間以内に自動削除されます。登録不要。無料 — 隠れた料金なし。

Frequently Asked Questions

What time format should I use?

Use HH:MM:SS (e.g. 00:01:30 for 1 minute 30 seconds) or plain seconds (e.g. 90). Both formats are accepted.

Can I trim just the beginning or end?

Yes. Set only the start time to remove the beginning. Set only the end time to cut after that point.

Does trimming change audio quality?

For lossy formats (MP3, OGG, AAC), trimming requires re-encoding and may slightly affect quality. For lossless formats (WAV, FLAC), the output is identical.

Online Trimmer vs DAW Export

Opening Audacity or GarageBand to trim a single clip means waiting for the app to load, importing the file, making the edit, and exporting — a process that can take several minutes. This trimmer loads in seconds in any browser tab, performs the cut, and hands you the file immediately, making it the obvious choice for quick, one-off trims.

FileCrank Audio Trimmer cuts audio files by start and end time. Supports MP3, WAV, FLAC, OGG, AAC, and M4A. Free, no signup, files deleted within 1 hour.

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