WORKLAZY TOOLS

Trim Audio & MP3

Select the specific sections you need from an audio or recording file, cut out the rest, and save the result.

Use this tool directly in your browser without installing software or signing in.

Section selection
Save selection
No automatic processing
Browser processing

Waveform Selection

Dragging the waveform creates a selection area. You can move the entire area, adjust the handles on both sides, and specify values down to 1ms by entering the start and end seconds.

Sample-level Editing

Mute changes selected samples to 0, and Cut and Delete pull trailing samples forward. Paste inserts the memory clip at the current playback position.

Voice Effects for Selected Section

Low Pitch, High Pitch, and Child Voice change the pitch while maintaining the original length, and Robot rapidly modulates the amplitude. You can preview the selected section before applying, and short crossfades are added at the boundaries.

Keyboard Shortcuts

Outside input fields, use Space to Play/Pause, and Ctrl+Z or Cmd+Z (on macOS) to Undo. Ctrl+Shift+Z, Cmd+Shift+Z, Ctrl+Y, or Cmd+Y are for Redo.

Undo and Memory

Uncompressed voice samples (PCM) for editing are kept per channel. The Undo history is automatically limited to a maximum of 12 steps and an approx. 256MB limit depending on file size, and is cleared when a new file is opened.

WAV and MP3

WAV creates highly compatible 16-bit uncompressed audio quickly. Audio processing features needed for MP3 saving and pitch effects are prepared on first use, reducing preparation time on the same editing screen.

Browser File Support

MP3 and WAV can be opened in general modern browsers. M4A, AAC, and OGG can be edited when the operating system and browser support the audio compression method in the file.

What is the difference in output length between deleting and muting audio?

Drag to select the required section on the waveform and play it first. Delete/Cut removes the selected section and pulls the remaining audio forward. Mute leaves the length of the section intact and only silences that part.

If it's a recording that needs to match a video's length, the difference between mute and delete is crucial. Paste inserts audio at the playback position, so check your cursor location. Before saving, listen to the areas before and after the editing boundaries to ensure they don't cut off awkwardly.

Examples and Selection Help

Deleting a selected section shortens the recording, while muting it keeps the total duration. Before saving, confirm which action applies to the selection and listen around both edit boundaries.

How do I trim and save by cutting out the unwanted parts at the beginning and end of a recording?

After selecting a section on the waveform, check whether the applied action will keep, delete, or mute the selected part. Test with a short segment first and listen to the audio before and after the boundary. Save the desired result before opening the next file.