✂️ MP3 Duration Trimmer
Browser‑only audio trimmer that decodes your MP3 locally, clips between start and end timestamps, and lets you download the result. To keep this library‑free and private, the export format is WAV (lossless) which you can convert if you specifically need MP3.
Trimmed Audio Preview:
How to Use This MP3 Duration Trimmer
The MP3 Duration Trimmer lets you set precise start and end times to clip audio directly in your browser. It’s private, fast, and ideal for extracting segments for intros, previews, or quotes.
- Upload: Click MP3 File and choose an .mp3.
- Set Times: Enter Start and End in
mm:ssorhh:mm:ss(e.g., 0:05 → 0:20). - Trim: Press Trim Audio to clip the selection and preview.
- Download: Save the result (WAV). Convert to MP3 later if needed.
Tips:
- Leave End blank to trim from Start to the end of the file.
- Use short test trims first to confirm timing.
- Large files take longer; performance depends on your device.
How It Works
The trimmer uses the Web Audio API to decode, slice, and export audio entirely client‑side.
- Decode: Reads the MP3 file into memory and decodes it to PCM with
AudioContext.decodeAudioData. - Clip: Computes sample indices from timestamps and copies samples into a new buffer (all channels preserved).
- Export: Encodes the trimmed PCM as a lossless WAV using an in‑browser encoder and provides a download link.
Why WAV? Native MP3 encoding isn’t available in browsers without extra libraries. WAV keeps the process private and compatible; convert to MP3 if you require that format.
When You Might Need This
- • Create podcast teasers by clipping a 30‑second highlight
- • Extract intro/outro segments for video or livestream overlays
- • Trim voice notes to remove dead air at the beginning
- • Prepare ringtone‑length clips from longer tracks
- • Cut lecture recordings into bite‑size study segments
- • Generate audio snippets for social posts and previews
- • Remove mid‑track silence or mistakes from raw takes
- • Create clean loop seeds by isolating exact measures
- • Clip interviews for quick review and collaboration
- • Build sound effects by isolating specific hits
Frequently Asked Questions
Does trimming happen locally?
Yes. Your file is decoded in the browser with Web Audio and never leaves your device.
Why is the download WAV and not MP3?
Browsers don’t provide native MP3 encoders without external libraries. To keep things private and dependency‑free, the tool exports WAV (lossless). You can convert it to MP3 afterward if needed.
What time formats can I use?
Use mm:ss (e.g., 1:23) or hh:mm:ss (e.g., 1:02:03). You can leave start as 0 or end blank to trim from a point to the end.
Are channels and sample rate preserved?
Yes. The tool keeps the original channel count and sample rate when building the trimmed buffer, then writes them into the WAV header.
How big can files be?
It depends on device memory and browser limits. If decoding fails or is slow, try trimming in smaller sections.