Choose one or more MP3 files
Click this area to browse for MP3 files, or drag and drop MP3 files directly onto it. Multiple files can be loaded together for batch editing.
Help Guide
How to use the MP3 editor.
This page explains each part of the editor, what it changes, and when to use it. All audio processing happens locally in your browser.
Typical editing steps
- Add one or more MP3 files by clicking the upload area or dragging files onto it.
- Select a track from the table below the editor.
- Adjust the highlighted waveform region or use the clip sliders to choose the section to keep.
- Set fade in, fade out, gain, normalization, and ID3 options if needed.
- Use Save Active Clip for one track, per-track Save clip buttons for individual rows, or Download All as ZIP for the full batch.
Add MP3 files
Tracks Loaded
Shows how many tracks are currently available in the batch list.
Import Status
Shows whether the app is idle, loading, restoring saved work, or handling an error. When many files are selected, the counter confirms the import is still progressing.
Cancel
Stops a restore or import in progress and performs a full reset so the editor returns to a clean state.
Active Track
Shows the file name of the track currently loaded into the waveform editor.
Defaults for new or loaded tracks
Clip duration
Sets how long the default selected clip should be when a new track is loaded. The app starts selection at the beginning of the song.
Default fade in
Sets the starting fade length applied automatically to new tracks.
Default fade out
Sets the ending fade length applied automatically to new tracks.
Apply to Loaded Tracks
Applies the current default clip duration and fade settings to every track already in the batch. This overwrites each track's existing selection and fade lengths.
Select and preview audio
Waveform
Displays the active track visually. The highlighted section is the part that will be exported.
Selection handles
Drag near the start or end of the highlighted area to resize the clip. Drag inside the highlighted area to move the whole selection without changing its length.
Play position line
A vertical line moves across the waveform during playback to show the current play position.
Duration
Shows the full length of the active track.
Position
Shows the current playback position while audio is playing.
Start and End
Show the exact start and end time of the selected clip.
Clip Length
Shows the total duration of the selected clip that will be exported.
Fade In and Fade Out readouts
Show the current fade lengths applied to the beginning and end of the exported clip.
Gain readout
Shows the volume gain currently applied to the active track.
Fine tune the active track
Clip start
Moves the start point of the selected clip.
Clip end
Moves the end point of the selected clip.
Fade in
Adds a gradual increase in volume at the beginning of the exported clip.
Fade out
Adds a gradual reduction in volume before the selected clip ends.
Volume gain
Raises or lowers the exported clip volume. Playback and waveform height update as the gain changes so you can hear and see the adjustment.
Normalize clip volume
Applies peak normalization during export. This helps make clips more consistent by raising quieter audio toward a safe peak level.
Write ID3 artist/title tags
When enabled, exported clips include ID3 artist and title tags. The app reads defaults from filenames such as Artist - Title.mp3, unless you manually enter row values in the track table.
Buttons below the sliders
Play Full Track
Plays the complete active track from the beginning.
Play Selection
Plays only the selected clip range, including fade and gain settings.
Stop
Stops the current playback.
Save Active Clip as MP3
Exports only the currently active track selection as a separate MP3 file.
Download All as ZIP
Exports every loaded track using its own selection and settings, then packages the MP3 clips into one ZIP file.
Reset
Clears the loaded tracks, saved restore data, selections, and editor state.
ZIP progress bar
Shows the percentage complete while the ZIP file is being prepared.
Batch list controls
Track row
Each row represents one loaded MP3 file. Click the track name to make that track active in the waveform editor.
Start, End, Clip, Fade In, Fade Out, Gain
These columns summarize each track's current export settings without needing to open every row.
Normalize and ID3
These columns show whether normalization and ID3 writing are enabled for that track.
Artist and Title fields
Use these to manually set ID3 tag values for a track. Manual values override the artist and title guessed from the filename.
Save clip
Exports that row's clip without changing which track is active.
Remove
Discards that track from the loaded list and removes it from future batch exports.
Refreshing the browser
The editor saves loaded tracks and edit settings in browser storage so work can be recovered after a refresh. Downloading a ZIP or pressing Reset clears that backup.
If a restore is taking too long, use Cancel to stop it and return to a clean editor.