Play audio backwards: reverse the whole file or just a selected part, for sound effects, reversed cymbals, backmasking experiments or a puzzle clue. Listen right away, undo if you change your mind, and save as MP3 or WAV.
How to use
- Drop one or more audio files. If you add several, put them in order and press Join.
- Drag across the waveform to select a part. Tap to place the cursor. Drag the handles to adjust the selection; zoom with + and − or pinch.
- Use the tools on the selection, or on the whole file when nothing is selected: Trim keeps the selection, Delete removes it.
- Press Play to listen. Undo and Redo step back and forth.
- Pick MP3 or WAV and press Download.
- Without a selection, Fade in and Fade out apply to the first or last 3 seconds; other tools apply to the whole file.
- Keep pitch changes speed with time-stretching; turn it off for a tape-style change where pitch moves with speed.
- Files are decoded at your device’s audio rate (usually 44.1 or 48 kHz). WAV exports are 16-bit.
- Everything runs in your browser. Long files need enough free memory.
Editing on the waveform
Drag across the waveform to select a part and tap to place the cursor; zoom in with + and − or a pinch for cuts accurate to a fraction of a second. Trim keeps the selection and Delete removes it. Without a selection, Fade in and Fade out apply to the first or last 3 seconds and the other tools to the whole file.
A short fade of 0.5 to 2 seconds at a cut avoids clicks; a longer fade-out of 3 to 5 seconds is the usual way to end a song excerpt or a ringtone.
Volume, normalize and speed
Volume changes the level by up to ±24 dB; +6 dB roughly doubles the signal amplitude, and the new peak is shown before you apply so you can avoid clipping above 0 dB. Normalize raises the whole file until its loudest peak sits at −1 dB. Speed runs from 0.5× to 2×: with Keep pitch on, time-stretching keeps voices natural; off, pitch moves with speed like a tape.
MP3 or WAV
WAV is uncompressed and lossless, exported at 16-bit and your device’s sample rate (usually 44.1 or 48 kHz); a stereo minute is about 10 MB. MP3 is encoded on your device at 128 to 320 kbps; at 192 kbps a minute is about 1.4 MB and sounds the same as the source for most listeners. Keep a WAV if you plan to edit again.
Frequently asked questions
How do I cut an MP3 online?
Drop the file, drag across the waveform to select the part you want to keep, press Trim, then download as MP3. Zoom in for a precise start and end.
Does editing reduce audio quality?
Edits are done on the decoded audio without loss. Saving as WAV is lossless; saving as MP3 re-encodes the audio, so choose 192 kbps or higher if the source was already an MP3.
How do I make audio louder without distortion?
Use Normalize to bring the loudest peak to −1 dB, or raise the volume while watching the new peak value. If the peak would go above 0 dB, the loudest parts clip and distort.
Can I join several audio files?
Yes. Drop several files, put them in order and press Join. You can then trim, fade or adjust the result and save it as one MP3 or WAV.
Which formats can I open?
Anything your browser can decode, usually MP3, WAV, M4A/AAC, OGG, Opus and FLAC. Export is MP3 or WAV.
Are my files uploaded?
No. Decoding, editing and MP3 encoding run in your browser, so the audio never leaves your device. Long files need enough free memory.