MixMasterAIAudio Trimmer
Drag the highlighted region on the waveform to mark the part you want to keep. Everything outside the region gets discarded. The opposite of the Audio Cutter, which removes the region instead. Useful for extracting a hook from a longer track, isolating a verse, or chopping a sample down to its useful section.
Sample-accurate to 0.01 seconds via numeric inputs, or visual via drag handles.
How it works
Drop the file
wavesurfer.js renders the waveform. The full file decodes locally so you can scrub and preview.
Up to 200 MB
Select what to keep
Drag the edges of the highlighted region directly on the waveform. Or type exact start/end timestamps in the inputs below for sample-accurate cuts. Press play to preview.
Resolution: 0.01s in the input, ~441 samples at 44.1 kHz
Trim
Web Audio API slices the buffer between start and end and writes a new WAV. The original file isn't modified — you download a new clip.
Output: 16-bit WAV at source sample rate
Frequently asked questions
Trim vs Cut — which do I want?
Trim keeps the highlighted region; everything else is removed. Cut removes the highlighted region; the audio before and after is joined. Use Trim to extract a hook or sub-clip; use Cut to remove an unwanted middle section.
Will the trim be sample-accurate?
Yes. The numeric inputs accept time to 0.01s precision, which is ~441 samples at 44.1 kHz. For zero-crossing accuracy (no clicks at the cut points), zoom in on the waveform and place the boundaries at the audio's natural zero crossings.
Why does my trim click at the edges?
Hard cuts mid-waveform produce a click. To prevent this, either trim at zero crossings (where the waveform line crosses the center) or apply a 5-10 ms fade with the Fade tool after trimming. Both approaches eliminate the audible click.
Can I export to MP3 directly?
Output is WAV — drop it into the WAV to MP3 converter for the next step. WAV is the right intermediate format because trimming is a lossless operation; encoding straight to MP3 here would force lossy compression for no reason.