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free tools nothing uploads

trim audio.

cut a segment out of an audio file. nothing uploads. ffmpeg.wasm running locally in your browser.

What This Is.

a free, in-browser tool that cuts a segment out of an audio file and gives you back the trimmed clip. useful when you need a 30-second pull-quote out of a 90-minute interview, or when you're trimming an episode intro before publishing.

mp3, wav, flac and ogg sources stream-copy the trimmed range, so the cut is lossless and near-instant. other formats re-encode to mp3 at a transcription-friendly bitrate so the output always plays.

Nothing Uploads.

most "trim audio" tools are server-side services. you upload your file, their server processes it, you download the clip. for most files that's fine — but for sensitive material (interviews under embargo, client-confidential audio, off-the-record recordings, audio you'd rather not have copies of on a third-party server), it isn't.

this tool runs ffmpeg.wasm directly in your browser. the file you drop is read into the browser's memory, decoded locally, and the segment is written back locally. no network request happens at any point during the trim. you can verify this in your browser's network tab — and we wrote a five-minute walkthrough on doing exactly that audit.

How To Use It.

  1. drop your audio (or video) file into the target above (or click to choose).
  2. scrub the inline player to find the segment you want. note the start and end timestamps.
  3. type the start and end into the two fields. accepted formats: HH:MM:SS, MM:SS, or seconds with decimals.
  4. hit trim. the clip downloads to your machine; nothing reaches us.

Limits.

  • 1 GB file cap. ffmpeg.wasm runs in browser memory; very large files run out of address space.
  • desktop browsers only. chrome, edge, firefox, safari, arc — all current versions work. mobile browsers don't have the WASM SharedArrayBuffer support reliably available.
  • end must come after start. both timestamps have to parse and end has to be the larger number.

What To Do With The Trimmed Clip.

  • quote it. a tight pull-quote pasted into a story or a social post lands harder than a link to a 90-minute file.
  • transcribe it. audiohighlight's transcription workspace handles the clip the same as the source — drop it in for a transcript.
  • edit it further. the trim is a clean cut at the requested timestamps; import it into audacity or your editor for fades or mixing.
  • publish it. an episode-intro-trimmed master is publish-ready.