Free Audio Trimmer — Cut & Split Audio Files
Trim audio to a time range or split into segments — a free alternative to Adobe Audition. No sign-up, no re-encoding.
Trim audio files to a specific range or split them at precise time markers — drag the in/out handles on a visual waveform and export the result. Works on MP3, M4A, WAV, OGG, and FLAC, all in your browser via ffmpeg.wasm. A free alternative to Audacity and Adobe Audition for one-off trims without a desktop install.
Built and maintained by James Nicolaus
Instant Cuts
Uses stream copy — no re-encoding means near-instant trimming with zero quality loss. Cut a 2-hour audiobook in seconds.
Trim or Split
Trim mode extracts a single segment. Split mode cuts at multiple time markers, producing separate files for each part.
Flexible Time Input
Enter time as seconds (90), MM:SS (1:30), or HH:MM:SS (1:02:30). Decimal seconds supported for precise cuts.
100% Private
All processing happens in your browser using WebAssembly. Your files never leave your device.
Free Audio Trimmer — Cut & Split Audio Files Online
The Free Audio Trimmer lets you trim audio files to a specific time range or split them into multiple segments at custom time markers — all directly in your browser. No sign-up, no uploads, no file size limits. Powered by ffmpeg.wasm with stream copy mode for instant cuts and zero quality loss.
Stitching multiple trimmed clips back into one file? The free audio merger joins them in any order with optional chapter markers. Need to swap formats while you're at it? Use the free audio converter to batch-convert between MP3, M4A, WAV, OGG, and FLAC.
Features
- Instant stream copy — Uses ffmpeg's
-c copymode. No re-encoding means near-instant processing and zero quality loss, even for long files. - Trim mode — Extract a single segment by entering a start and end time. Perfect for grabbing a clip from a podcast or cutting silence from a recording.
- Split mode — Add multiple time markers and split the file into separate segments. Great for breaking audiobooks into chapters or splitting a DJ mix into individual tracks.
- Flexible time input — Enter time as seconds (90), MM:SS (1:30), or HH:MM:SS (1:02:30). Decimal seconds supported for precision.
- Audio preview — Listen to the file before trimming to verify your time markers are correct.
- 100% client-side — Uses ffmpeg.wasm (WebAssembly). Your files never leave your device.
How to Trim Audio
- 1. Add a file — Drag and drop an audio file into the upload area, or click to browse. MP3, M4A, WAV, OGG, FLAC, AAC, and WebM are supported.
- 2. Choose mode — Click Trim to extract a single segment, or Split to cut at multiple markers.
- 3. Enter times — For Trim mode, set the start and end time. For Split mode, add one or more time markers where you want to cut.
- 4. Process — Click the action button. Stream copy mode makes this nearly instant regardless of file length.
- 5. Download — Download your trimmed clip or all split segments.
Audio Trimmer vs. Audio Editor
| Feature | Audio Trimmer | Audio Editor |
|---|---|---|
| Purpose | Quick, precise cuts by timestamp | Full waveform editing with effects |
| Speed | Near-instant (stream copy, no re-encoding) | Depends on file length (re-encodes) |
| Split support | Yes — multiple markers, separate files | No — single track editing |
| Effects | None (cut only) | Gain, fade, normalize, reverse, speed |
| Waveform | No | Yes — visual selection |
| Quality | Lossless (exact copy) | Re-encoded output |
Tips, Mistakes & Takeaways
Tips
- →Use the time-display readout (not the visual handle) for frame-accurate trim points.
- →When splitting at multiple markers, plan your filenames first — auto-generated names use the source name plus an index.
- →Export to the same format as the source to avoid an unnecessary re-encode pass — much faster.
- →Apply a short fade at trim boundaries if cutting mid-track — abrupt cuts produce audible clicks.
Common Mistakes
- !Trusting the waveform display as exact at every zoom level — for sub-second precision, use numeric time entry.
- !Trimming a lossless source down to MP3 just to 'save space' — you've now baked compression into the keeper.
- !Closing the tab before clicking export — the trimmed audio lives only in memory until you save it.
Key Takeaways
- ✓Visual-waveform trim and split for any common audio format.
- ✓All processing happens in your browser — source files stay on your device.
- ✓Not a multi-track editor — single track in, single track or split-set out.
Frequently Asked Questions
Why is trimming so fast?
The trimmer uses ffmpeg's stream copy mode (-c copy), which copies the audio data without decoding or re-encoding it. This means a 2-hour audiobook can be trimmed in under a second. The only processing is reading/writing the container format.
Are the cuts frame-accurate?
Stream copy mode cuts at the nearest keyframe, which may be slightly before your requested timestamp (typically within a few milliseconds). For compressed formats like MP3, this is usually imperceptible. For frame-exact cuts, you would need re-encoding, which our Audio Editor supports.
Can I split an audiobook into chapters?
Yes. Switch to Split mode and enter the timestamp for each chapter break. The tool will produce one file per chapter, numbered sequentially (e.g. book-part001.mp3, book-part002.mp3, etc.). Use Download All to grab them all at once.
What happens to metadata and tags?
Stream copy preserves most metadata from the original file (title, artist, album, etc.) in each output segment. However, chapter markers in the original file are not automatically adjusted for new segment boundaries.