VideoFrames
Decode a file.
Video or audio, up to ten minutes. The browser decodes it to PCM and draws a waveform from the actual samples.
KEEP THE GOOD PART
Audio Trimmer
Drag a range on the real waveform, preview exactly that selection and export it as WAV or MP3.
Keep the part worth hearing.
Open a video or audio file, drag the selection over the waveform, then export just that range.
WAV or MP3 · up to 10 minutes · no uploadOpen a video or audio file, then drag the selection.
THREE SMALL MOVES
A range, then a file.
Drag the range.
Move the whole selection or pull either handle. The start and end fields stay in sync for exact values.
Preview, then keep it.
Preview plays only the selected range. Export as lossless WAV or a smaller MP3 at 128–320 kbps.
WHAT IS HAPPENING
The waveform is real.
Sample peaks, not decoration.
The drawing is built from the decoded channel data. Quiet recordings are normalised only for display, never in the export.
A second pass only for MP3.
WAV writes the decoded samples directly. MP3 re-encodes them, which is a second lossy generation and can be audible.
Local decoding.
The file is decoded with WebAudio in this tab. The encoded result is written by a local Worker.
A FEW GOOD QUESTIONS
Before you cut.
Does trimming re-encode the whole file?
Only the selection is encoded. WAV writes the decoded PCM range; MP3 encodes that range through LAME in a Worker. The source file is untouched.
Can I export MP3 from any sample rate?
MP3 supports the usual 32, 44.1 and 48 kHz family. If the decoded rate is outside the supported set, the MP3 button is disabled and WAV remains available.
Why is there a ten-minute limit?
Decoded audio lives in memory. Ten minutes of stereo audio is already a large allocation, and the limit keeps a phone browser from failing halfway through an export.
Does preview play only my selection?
Yes. Playback starts at the selection start and stops at its end, so you hear the exported range rather than the whole file.
Is my audio uploaded?
No. Decoding, preview and encoding all happen on this device. There is no upload endpoint or account.