Cutting to the part you need
- Open Audio Trimmer and add one MP3, WAV, M4A, FLAC, Ogg or WebM file of up to 15 minutes. The waveform appears once the browser has decoded it.
- Drag across the waveform to select what to keep, then drag the handles to refine it. Tap to place the playhead and listen; Start here and End here, or the [ and ] keys, set the edges at the playhead, and Space plays the selection.
- For fine cuts, press Zoom to selection to spread the selection across the full width, or open Exact times and type the start and end to a hundredth of a second.
- Play the selection once more, choose a format, and click Trim audio.
Cut on a pause rather than in the middle of a word. The waveform makes pauses easy to see: they are the flat stretches between the peaks of speech or the beats of music.
Cut a WAV file and keep WAV output
For an exact excerpt, open Audio Trimmer, add the WAV and enter Start 10 and End 30 under Exact times. Choose WAV before pressing Trim audio, then download the 20-second result. Keep fades off and Volume at Original if you only want the cut.
Try the example: Cut WAV audio with exact times · Download a 40-second synthetic WAV
Quick trim exports a new 16-bit PCM WAV. It avoids an MP3 encode, but the browser may resample the source, and 24-bit or floating-point audio becomes 16-bit. Supported title or artist tags may be copied, but the file is rebuilt and exact source bytes are not preserved. Keep your original for archival or mastering work.
Removing a cough, a mistake or an ad
Sometimes the problem is in the middle. Choose Remove selection, select the part to take out, and the tool keeps everything else and joins the two sides with a crossfade of up to 12 milliseconds, limited by the length of both remaining sides. That is too short to hear as a fade but long enough to stop the click you get when two waveforms are butted together at different heights. Play the cut to hear a few seconds either side of the join before saving.
For several separate cuts, open Interactive Editor and split or trim clips on the timeline. Keep working from the original recording, preview the joined result and export once; you do not need to download and reimport between cuts.
Make multiple cuts: Open Audio Trimmer in Interactive Editor
Fades: softer starts and endings
A clip that starts at full volume in the middle of a sound can feel abrupt, and one that stops mid-note sounds broken. Open Fade edges and add a fade in, a fade out, or both, up to five seconds each. Half a second is enough to remove a click; two or three seconds make a music excerpt end gracefully. The preview plays the fades, so you can hear them before you save.
Making it louder without distortion
Digital audio has a ceiling. Every sample sits between minus one and plus one, and a boost that pushes peaks past that ceiling flattens them, which is the crackle people call clipping. The trouble is that how loud something sounds depends on its average level, while clipping depends on its loudest instant. A voice memo recorded far from the phone can be both quiet on average and close to the ceiling on a single consonant.
Open Volume in Audio Trimmer and you get three choices:
- Original keeps the level as recorded.
- Even out measures the loudness of the saved part the way broadcasters do (ITU-R BS.1770, in LUFS) and brings it to about −16 LUFS, a comfortable level for podcasts, voice notes and most music on phones. It never lets a peak go above −1 dBFS, so it will stop short of the target rather than distort. A loud recording is turned down to the same level.
- Custom changes the level by up to 12 dB either way. About +10 dB sounds roughly twice as loud. If a boost pushes peaks past full scale they are limited, and the result says so; choose a smaller boost or Even out if you hear harshness.
The preview plays the original volume; the saved file carries the change, and the result line shows exactly how many decibels were applied. Volume cannot remove background hiss or hum: turning a recording up turns its noise up too.
To change the level of whole files without trimming them, including recordings longer than 15 minutes or a batch of up to 20, use Change Audio Volume. It offers the same Even out, a fixed change of up to 20 dB either way with a limiter that holds peaks just under −1 dB, and Maximize, which adjusts measured peaks toward −1 dBFS, caps boosts at +40 dB, can lower already loud audio and leaves silence unchanged. Every file shows its measured loudness and the change it will get before you start. For the sound of a video, Change Video Volume offers similar controls and copies supported picture tracks when the chosen container can hold them; otherwise video is re-encoded.
Choosing a format
Installation guidance: Apple: create a custom ringtone with GarageBand
MP3 plays everywhere and is the usual choice for sharing. M4A (AAC) is a little more efficient and suits Apple devices. WAV and FLAC avoid another lossy audio encode, but decoding and export can change sample rate or bit depth. WAV is written as 16-bit PCM; FLAC size depends on the recording. Converting a compressed file to WAV or FLAC does not restore detail it already lost. Ringtone keeps up to 30 seconds from the start point and saves M4R. Toolkitta’s M4R export cap is 40 seconds; that is separate from installation. Apple’s GarageBand route uses a 30-second ringtone limit.
Everything happens on your device. The file is decoded and encoded by your browser, the original stays untouched, and supported title, artist and cover-art tags may be copied when the chosen format supports them. Check the saved file in your player.