How to Trim Audio Online (Free, No Upload)

To trim audio online, drop your file into a browser-based trimmer, set the start and end points, and export the shortened clip — no software install required. PixelTools' [Audio Trimmer tool](/trim-audio) does this entirely in your browser using WebAssembly (ffmpeg compiled to run locally), so the file never leaves your device. It accepts MP3, WAV, M4A, OGG, and FLAC, and it outputs in the same format you uploaded — no forced conversion. It's free, requires no account, and works whether you're cutting a 10-second ringtone or trimming a two-hour recording down to the useful part.

Trimming audio comes up more often than it seems. Podcasters cut a long recording down to just the segment they want to share as a teaser or clip. Voice memos often have a few seconds of silence, fumbling, or background noise at the start before the actual message begins. People turn a favorite part of a song into a ringtone or notification sound. Musicians and producers pull a short sample out of a longer track. And plenty of recordings — interviews, lectures, meeting audio — have dead air at the beginning or end that's easiest to just cut off rather than listen through. In all of these cases, the fix is the same: keep the part you want, discard the rest, without touching anything else in the file.

Go to the [Audio Trimmer tool](/trim-audio) and drop in your file — MP3, WAV, M4A, OGG, or FLAC. Set the start and end points for the section you want to keep, either by dragging on the waveform or entering exact timestamps, then process the file. Because the cutting happens with WebAssembly directly in your browser tab, there's no upload wait and no server queue — it runs on your own device's processing power. Once it's done, download the trimmed clip. The output stays in the same format as your original, so a WAV file comes out as WAV and an M4A comes out as M4A — there's no extra conversion step to deal with.

Because the trimming happens with WebAssembly directly in your browser, your audio file is never uploaded to a server — it stays on your device from start to finish. That matters for anything personal or sensitive: private voice memos, unreleased music, client recordings, or interview audio you'd rather not send through a third-party server. There's also nothing to clean up afterward, since the file was never stored anywhere but your own machine. The tool supports MP3, WAV, M4A, OGG, and FLAC — the formats people actually run into day to day, whether from a phone recorder, a DAW export, or a downloaded audio file.

A good trim starts and ends exactly where you want, without clipping the beginning of a word or leaving an awkward pause. Zooming in on the waveform (rather than eyeballing a rough timestamp) makes it much easier to land the cut precisely between sounds instead of in the middle of one. If you're trimming out dead air at the start of a voice memo or recording, listen back to a second or two before your chosen start point to make sure you're not cutting off the first syllable. For music or sample extraction, cutting on a beat or a natural pause in the audio usually sounds cleaner than an arbitrary timestamp, even if it means adjusting the point by a fraction of a second.

Trimming is often just one step in a larger workflow. If you're pulling audio out of a video file first, the [Extract audio from video (MP4 to MP3) tool](/mp4-to-mp3) converts a video into an audio file you can then trim. If you need the opposite — a video with the audio track stripped out entirely, like for a silent background clip — the [Remove Audio from Video tool](/remove-audio-from-video) handles that. And if your trimmed clip needs to end up in a different audio format than it started in, for a specific app or device, the [Convert Audio Format tool](/convert-audio) covers that conversion, also fully in-browser with no upload.