Trim Audio

What does trimming actually keep?

Trimming is a keep operation: you define one region and everything outside it is thrown away. That is the opposite mental model from cutting a piece out of the middle. If you want to keep the middle and drop the ends — the usual case for topping and tailing a recording — trimming is exactly right. If instead you want to remove a chunk from the middle, export the part before it and the part after it as two trims and join them with merge audio; the audio cutter keeps a single selection too, just like this tool.

Because the trim is a straight copy of the selected range, it is fast and, on formats that support it, lossless: the audio inside your selection is not re-encoded, it is passed through untouched. You lose nothing in quality — you only lose the parts you chose to drop.

Which files can you trim, and does the format change?

The tool reads the common audio formats and always writes back in the same one, so you never have to think about a conversion side-effect.

When do you reach for a trimmer?

• Cutting dead air and the "is it recording?" chatter off the front of an interview.
• Grabbing a single verse or chorus out of a song.
• Topping and tailing a voice-over before it goes into a video edit.
• Keeping just the answer from a long voice memo.

A trimmer is also the quickest way to make a file smaller without touching its quality: duration is one of the two things that decide file size, so lopping a minute of silence off the front of a recording removes that minute’s worth of bytes exactly. If your goal is a smaller file rather than a shorter one, pair a trim with a bitrate reduction on the compress audio page — but trimming first is free and lossless, so it is always the right opening move.

Is my audio uploaded to trim it?

No. The waveform is drawn and the trim is performed by ffmpeg compiled to WebAssembly, running inside your tab. Your file is read into memory, sliced and handed back as a download — it never touches a server. You can prove it: open your browser DevTools, switch to the Network tab, and trim a file. No upload request appears. You can even disconnect from the internet after the page has loaded and the trimmer keeps working. That matters for unreleased music, confidential recordings and client work.

Related audio and video tools

Need two pieces instead of one? Split the audio at a timecode. Building a ringtone? The ringtone maker trims and shapes a phone-length clip. Joining several trimmed pieces? Use merge audio. And if your audio is currently locked inside a movie file, extract the audio from a video first, then trim the result here.