How to use the Audio Effects Editor
Load one or more audio files, choose the edit scope, and click Apply. The browser decodes the files, shows a waveform and the Duration & format changes panel, then writes new WAV files. The page does not send the audio in an upload request.
- Click browse files, or drop files into Drop one or more audio files here.
- Click the waveform to seek, or drag across it and choose Apply to selected range. Keep Apply to entire file for a full-file edit.
- Set Reverse, Tempo / speed, Pitch shift, Fade in (seconds), Fade out (seconds), Fade curve, and Bit depth.
- Click Apply, check Duration & format changes and the warnings, then compare Original with Edited.
- Click Download edited file, or use Download all (ZIP) for the queue.
Change audio pitch and tempo
Tempo / speed accepts 25% to 400%. Leave Preserve pitch checked to use WSOLA time-domain time-stretching. Clear it and the editor uses linear resampling, so pitch changes with speed. Pitch shift accepts -12 to +12 semitones and keeps the processed region's duration.
For example, a selected section can be changed without touching the rest of the file:
Input: audio file, selected range 00:12.000-00:18.000, Tempo / speed 75%
Output: new WAV, that range slowed with Preserve pitch onAdd a fade or reverse an audio range
Turn on Reverse to reverse sample order within the chosen scope. Enter a duration in Fade in (seconds) or Fade out (seconds), then choose Fade curve: Linear, Exponential (ease-in), or Logarithmic (ease-out). A tempo change can alter the selected region's length and the file's total duration.
If Apply to selected range is checked without a waveform selection, the editor uses the whole file and shows a warning. Samples outside a real selection pass through before the editor applies any uniform gain reduction needed to prevent clipping.
Review warnings and export a WAV
The result panel compares duration, sample rate, channels, format, and estimated file size. Under Bit depth, choose 16-bit PCM, 24-bit PCM, or 32-bit float. The output is a new WAV at the source sample rate. If the processed signal exceeds the safety level, the editor reduces output gain uniformly and reports it.
Large speed changes can produce warbling or smeared transients. A pitch shift beyond 7 semitones can move voice formants because the editor applies no formant correction. Files the browser cannot decode are rejected with an error.
Use cases for audio effects editing
A podcast editor can select a spoken phrase, slow it with Preserve pitch, and compare the result with Original. A music maker can reverse a selected transition or apply a fade-out before exporting a WAV.
For several source files, use Add more files. The same settings run across the queue, while each file keeps its own waveform selection. Processed files can be collected with Download all (ZIP).
Choose the right audio edit tool
Use Audio Edit Tools when the change belongs on one audio file's timeline. Choose Trim Audio to set a start and end point for a cut. Choose Audio Cleaner to reduce steady background noise, hum, hiss, or room echo.
Choose Audio Tag Editor when you need to change title, artist, album, or other metadata while preserving MP3, FLAC, or WAV audio bytes. This editor changes decoded audio and writes a new WAV.
Frequently asked questions
Does changing audio tempo keep the pitch the same?
Yes, when Preserve pitch is checked. With it cleared, linear resampling changes pitch and duration with the speed setting.
How do I apply an audio effect to part of a file?
Drag across the waveform, select Apply to selected range, and then set the effect. The unselected samples pass through, while the selected region can change length.
What format does the Audio Effects Editor export?
It exports a new WAV at the source sample rate. Bit depth controls the output as 16-bit PCM, 24-bit PCM, or 32-bit float.
Why did my edited audio file change duration?
Tempo or speed changes alter the length of the processed region. A pitch-only change preserves that region's duration, while a combined tempo and pitch edit can change the total file length.