Audio Trimmer
Crop the part of an audio file you actually want. Enter a start and end time — either in seconds ("30"), MM:SS ("1:15"), or HH:MM:SS ("0:01:15") — and download just that slice. Leave the end blank to cut from the start through the end of the file, or use "+30" to mean "30 seconds from the start". By default we copy the audio stream losslessly with no re-encoding, which is instant but cuts on container boundaries — if you need sample-accurate cuts, pick MP3 or WAV in the format dropdown to force a re-encode. Everything runs in your browser via ffmpeg.wasm; the file never leaves your device.
Drop .mp3 / .wav / .ogg / .flac / .m4a / .aac file here
or click to choose
Options
Privacy
Runs entirely in your browser — nothing is sent to any server.
Cost
Free. No sign-up, no watermark.
Supports
.mp3, .wav, .ogg, .flac, .m4a, .aac → .mp3
Related tools
Tools that work with the same formats — most users open one of these next.
MP3 to WAV
Convert MP3 audio to uncompressed WAV — free online, no upload.
MP3 to OGG
Convert MP3 audio to Ogg Vorbis — free online, no upload.
MP3 to FLAC
Convert MP3 audio to FLAC (lossless) — free online, no upload.
MP3 to AAC
Convert MP3 audio to AAC with selectable bitrate — free online, no upload.
MP3 to M4A
Convert MP3 audio to M4A (AAC in MP4 container) — free online, no upload.
MP3 to Opus
Convert MP3 audio to Opus with selectable bitrate — free online, no upload.
Frequently asked
Is Audio Trimmer free to use?
Yes. Audio Trimmer is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.
Do my files and data stay private?
Yes — Audio Trimmer runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How does Audio Trimmer work?
Open Audio Trimmer, drop in your MP3, WAV, OGG, FLAC, M4A, AAC file, choose any options, and click Convert. Your browser does the work locally and produces a MP3 file you can save right away.
What's the maximum file size for Audio Trimmer?
Because Audio Trimmer runs in your browser, the maximum size depends on your device's available memory. Most modern phones and laptops handle files up to a few hundred MB without issues.