Trim any audio file to exact start and end times — MP3, WAV, AAC, OGG. Lossless WAV cut. Preview before download.
Built & maintained by Pappu Venkata Subbi Reddy, founder of Clacify · Updated August 2026
MP3 Cutter lets you trim and cut audio files online — free, in your browser. Load an MP3 (or other audio), select the start and end of the segment you want on the waveform, preview it, and download just that part. It's perfect for making ringtones, trimming silence, cutting a clip from a song or podcast, or grabbing a sound bite. Because the audio is processed locally, your files are never uploaded to a server — fast, private, and with no quality-destroying round trip.
A copy of FFmpeg compiled to WebAssembly (FFmpeg WASM, ~10 MB, loaded once from a CDN) runs entirely inside your browser tab. When you select a start and end point, the tool runs a standard FFmpeg trim command against those exact timestamps (to millisecond precision) and re-encodes the selected range into your chosen output format. Separately, the waveform you see and drag against is drawn using the Web Audio API's decoder — that's what renders the visual preview, but the actual cut and file export is done by FFmpeg, not by hand-editing raw samples. Because FFmpeg WASM runs locally in your browser, the file never leaves your device and there is no upload/download round trip.
| Format | Encoding | Best for |
|---|---|---|
| WAV | Uncompressed PCM (pcm_s16le) | Archiving, further editing, no lossy compression |
| MP3 | MPEG audio (LAME encoder, quality 2) | Ringtones, sharing — plays on virtually anything |
| AAC | Advanced Audio Coding, 192kbps | iPhone/Apple devices, small size at high quality |
| OGG | Vorbis (quality 5), open, patent-free codec | Web/app use and open-source projects |
Every export — including WAV — goes through an FFmpeg re-encode of the selected range; WAV's pcm_s16le codec is itself uncompressed, so it introduces no lossy compression, but if your source file was already a compressed format (like MP3), that original compression can't be undone.
Every trim runs the selected range through FFmpeg's encoder for your chosen format. MP3/AAC/OGG each apply lossy compression to shrink the file, which is a real (if usually small) quality trade-off — especially if the source was already a compressed MP3, since compressing it a second time compounds the loss. WAV's pcm_s16le encoding is uncompressed, so it doesn't add any further lossy compression on top of what your source file already had.
The start and end points you drag on the waveform are passed to FFmpeg as exact timestamps to millisecond precision (e.g. 12.483 seconds), not rounded to the nearest whole second. That's what makes it possible to cut close to a beat or just before a word starts, rather than getting a clip that's off by a fraction of a second.
This tool also accepts video files, not just audio — drop in an MP4 or MOV and it decodes the video's audio track the same way, letting you trim out a music cue, a line of dialogue, or a sound bite without needing a separate video editor first.
Upload your MP3 to Clacify's Audio Cutter. A waveform shows the audio. Drag the start and end handles to mark the section you want to keep, or type exact timestamps. Preview the selection — if it sounds right, click Download. The trimmed audio saves to your device in the same format.
Upload your song (MP3 or M4A) to Clacify's Audio Cutter. Find the chorus or melody section you want as your ringtone (typically 20–30 seconds). Set the start and end points, preview, and download. Transfer the trimmed MP3 to your phone — on Android, move it to the Ringtones folder; on iPhone, use GarageBand or iTunes to set it as a ringtone.