Cut Audio Online — Trim MP3 Without Quality Loss
Trim MP3, WAV, M4A locally in your browser: precise seconds, smooth fade-in/out, no quality loss, no upload. Works on mobile.
Drop audio here or choose a file
MP3, WAV, M4A, OGG, FLAC, AAC — up to ~150 MB
About this audio cutter
This is an online MP3 cutter that runs entirely in the browser. Drop a file in, select the part you want by dragging the markers on the waveform or typing precise seconds, then download the result as MP3 (via lamejs) or lossless WAV.
All common formats are supported: MP3, WAV, M4A (iPhone AAC), OGG, FLAC, OPUS — anything the Web Audio API can decode in your browser. Smooth fade-in / fade-out is built in, and MP3 export supports bitrates from 128 to 320 kbps.
Nothing is uploaded — your file and its trimmed segments stay on your device. No sign-up, no watermarks, no rate limits, no ads inside the audio. Works on desktop and mobile.
Where it helps
Phone ringtone
Cut a 20–30 second hook from a favourite track and export 320 kbps MP3 — drop into iPhone via GarageBand or copy to Android's Ringtones folder.
Audio for video and Reels
Match an audio bed to your TikTok, Instagram Reels or YouTube Shorts. A smooth fade-out hides any abrupt cut.
Podcasts and interviews
Trim long pauses, false starts, dead air at the end. WAV export keeps full quality for further editing.
Music and dance practice
Loop a single verse or chorus for rehearsal or choreography. Millisecond-accurate cut points — no extra clicks or breaths.
FAQ
How do I cut MP3 without quality loss?
Two paths. First — export to WAV: it's a lossless format, every original sample is kept without re-encoding. Second — export MP3 at 320 kbps: in practice, indistinguishable from the original by ear. Note that any MP3→MP3 re-encode adds tiny generation loss in theory, so for important masters, prefer WAV.
Does it work on mobile?
Yes — Safari on iPhone and Chrome on Android both support file upload, finger-drag on the waveform, and download. On iPhone the first preview tap may be needed (iOS policy), but trimming and export work straight away.
Does the file get uploaded?
No, everything runs locally. The file is decoded with the Web Audio API in your browser, trimming runs over audio data in memory, MP3 is encoded by lamejs (also in the browser), WAV is assembled from PCM samples manually. No network requests with your audio — disconnect from the internet after the page loads and you'll see trimming still works.
Which formats are supported?
Input: anything the Web Audio API can decode — MP3, WAV, M4A (iPhone AAC), OGG, OPUS, FLAC, AAC, WebM audio. Output: MP3 (128/192/256/320 kbps) or WAV (16-bit PCM, lossless, original sample rate).
Can I add a smooth transition?
Yes — the tool supports fade-in (smooth start) and fade-out (smooth end) with separate sliders in seconds. The linear gain envelope is applied at export time, so smoothness is preserved in the resulting file.