ALL AUDIO TOOLS18
Audio Trimmer
Trim Audio Online — Free Audio Cutter
Upload any audio file, set start and end times, and download the trimmed clip.
Nothing is enforced, but the file is decoded to 32-bit float twice over — once on drop to draw the waveform, once to make the cut — at roughly 20 MB per minute of 44.1 kHz stereo each time.
About Audio Trimmer
Need to cut a section from an audio file? Whether you are creating a custom ringtone, extracting a sound effect, clipping a favorite part of a song, isolating a quote from an interview, or trimming silence from the beginning and end of a recording, this tool handles it with precision. Upload your MP3, WAV, OGG, M4A, or FLAC file and use the waveform display to visually set the start and end times for your clip. Fine-tune the selection with the IN and OUT sliders — the cut is made on the decoded samples, so it lands exactly where you asked rather than snapping to a keyframe the way video trimming does. Choose to export the trimmed clip as MP3 (smaller file size, great for sharing) or WAV (lossless quality, ideal for further editing). The tool decodes your audio using the Web Audio API, slices the AudioBuffer to the specified time range, and re-encodes it cleanly without any glitches or artifacts at the cut points. Everything runs in your browser — no files are uploaded to any server, keeping your audio completely private. This makes it safe for trimming confidential interviews, personal recordings, and licensed audio content.
Questions
What audio formats are supported?
You can trim MP3, WAV, OGG, M4A, FLAC, and AAC files — any format your browser can decode. The trimmed output is available as either MP3 or WAV.
Can I preview before trimming?
Yes. After uploading your file, you can play the audio and adjust start/end times. The playback lets you verify your selection before exporting.
Is there a maximum file duration?
There is no enforced limit, but the cost is memory rather than time: the file is decoded to 32-bit float once on drop to draw the waveform and again to make the cut, at roughly 20 MB per minute of 44.1 kHz stereo each time. Podcast-length files are fine on a desktop; multi-hour files can exhaust the tab, especially on phones.
Does trimming re-encode the audio?
Yes — the file is decoded, cut at the exact sample you selected, and re-encoded to the format you choose. Export WAV to avoid any new lossy step; MP3 export is a fresh lossy encode at your chosen bitrate (128-320 kbps).
What do the presets actually change?
Only the export settings: Podcast sets MP3 at 128 kbps, Music sets MP3 at 320 kbps, and Lossless switches the output to WAV. No normalization, fades, or channel changes are applied — and adjusting any control by hand switches you back to Custom.
Is my file uploaded to a server?
No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.