Audio Cutter
Trim MP3, WAV, M4A, OGG or FLAC files in your browser: set start and end points over the waveform, preview the selection, add optional fades and download the cut as a WAV file.
Drop your audio file here
MP3, WAV, OGG, M4A, FLAC or AAC (any format your browser can decode)
Max 1 file, up to 50.0 MB each
About the Audio Cutter
Drop an audio file and your browser decodes it with the Web Audio API. The waveform you see is drawn from the decoded sound: the file is split into 150 slices, and each bar shows the loudest sample in its slice, so quiet passages, pauses and loud sections are easy to spot. Move the Start Time and End Time sliders (in 0.1-second steps), press Preview to hear just that part, and press Cut Audio.
The cut is saved as a 16-bit PCM WAV file with the same number of channels as the original, at the sample rate your browser decoded it at (usually 44.1 or 48 kHz). WAV is uncompressed, so the output is often larger than the MP3 you started with: about 10 MB per minute of stereo at 44.1 kHz. The tool does not export MP3. Trimming does not re-compress the audio, but it also cannot restore detail that the original MP3 compression removed.
Optional fades soften the edges: Fade In and Fade Out each ramp the volume over 1 second, or over half the selection if it is shorter than 2 seconds. That avoids an abrupt start or a click at the end.
Common jobs: cutting a 30-second ringtone or alarm sound from a song, keeping just the answer to one question from a recorded interview, removing silence before and after a voice note, or extracting a sound effect. If the result is too quiet, run it through the Audio Volume Normalizer. For video files, use the Video Cutter instead.
How to use the Audio Cutter
- 1
Add your audio file
Drop a file on the drop area or click Browse Files. MP3, WAV, OGG, M4A, FLAC and AAC are accepted, up to 50 MB.
- 2
Set the start and end
Drag the Start Time and End Time sliders. The highlighted part of the waveform shows your selection and its length is shown below.
- 3
Preview the selection
Press Preview to play from the start point; playback stops at the end point.
- 4
Add fades and cut
Tick Fade In (1s) or Fade Out (1s) if wanted, press Cut Audio, listen to the result and click Download Cut Audio (WAV).
What it can do
Real waveform
Bars show the peak level of each part of the decoded audio, not a decorative pattern.
Selection preview
Plays only the selected range so you can check the cut points before saving.
Fade in and fade out
Linear 1-second fades, shortened automatically for very short selections.
Uncompressed WAV output
16-bit PCM, keeping the channel count, so the trimmed audio is not compressed a second time.
Processed on your device
Decoding, cutting and WAV encoding all happen in the browser tab.
Limitations
- Output is WAV only; there is no MP3 or M4A export.
- One continuous selection per cut. To remove a section from the middle, you would need two cuts and a separate tool to join them.
- Files are limited to 50 MB, and the whole file is decoded into memory, so long recordings can be slow on phones.
- Which formats open depends on your browser; OGG, for example, is not supported in every version of Safari.
- Start and end move in 0.1-second steps, which is fine for speech and music but not for sample-exact editing.
Privacy
Your audio file is decoded and cut in your browser with the Web Audio API; it is not uploaded to FlexyPdf's servers.
Frequently asked questions
Why is the cut file bigger than my original MP3?
The cut is saved as uncompressed WAV, which takes about 10 MB per minute of stereo audio at 44.1 kHz. MP3 is compressed, often to around 1 MB per minute.
Can I save the cut as MP3?
No, only WAV. Most phones, editors and media players play WAV. If you need MP3, convert the WAV with your audio software.
Does cutting reduce the sound quality?
No new compression is added: the decoded audio is written as uncompressed 16-bit WAV, the same bit depth as CD audio. If your browser decodes at a different sample rate from the original (48 kHz instead of 44.1 kHz, for example), the audio is resampled, which is not normally audible.
Can I use the result as a ringtone?
Phones that accept WAV ringtones can use it directly. iPhones need ringtones in a different format (.m4r), so you would have to convert it first.
Why won't my file open?
Your browser could not decode it. Try another browser, or convert the file to MP3 or WAV first. Files over 50 MB are not accepted.
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