Audio Trimmer
Trim a section out of an audio file — fast, in your browser.
Drop your file here
or click to browse
Max 100MB
You are responsible for ensuring you have the rights to process the audio you upload. This tool does not transmit your files to any server — every operation runs in your browser.
About Audio Trimmer.
Trim a Section Out of Any Audio File — In Your Browser
Upload an MP3, M4A, AAC, WAV, OGG, or FLAC file, drag the in / out handles on the waveform to where you want the clip, and download the trimmed result. The whole pipeline runs locally in your browser — your audio never touches a server.
Stream-Copy Trim — Near Instant
By default the tool uses FFmpeg's stream-copy mode, which performs a container-level cut without re-encoding. That means trimming a 10-minute MP3 takes a fraction of a second, the file size is exactly proportional to the new length, and the audio quality is identical to the source. Stream-copy cuts at the nearest keyframe, so the start of the clip can shift by a fraction of a second — fine for almost every use case (ringtones, podcast highlights, voice-memo cleanup).
Exact-Frame Trim
Need a sample-accurate cut? Toggle "Exact frame trim" and the tool re-encodes around the in/out points. Slightly slower and more memory-intensive — fine on desktop, not recommended for large files on mobile devices.
Privacy and Device Safety
FFmpeg-WASM is a sizeable download (~25 MB) so the tool only loads it when you press Trim — not on page open. Waveform rendering uses a decimated peak-list, not the full PCM buffer, so memory usage stays bounded regardless of file length. There's a 100 MB upload cap and a soft warning on mobile for large files. Nothing is uploaded; everything runs locally and the temporary buffers are cleaned up immediately after export.
Common Use Cases
- Ringtones: grab a 20-second clip from your favorite song.
- Podcast highlights: pull out a quote without re-encoding the whole episode.
- Voice memos: trim the silence at the start and end before sharing.
- Course recordings: chop a long lecture into chapter-sized pieces.
Frequently asked questions.
How do I trim an audio file online for free?
Open the Audio Trimmer, load your audio file, then set the start and end points for the section you want to keep. The tool cuts that segment and lets you download it. There's no signup, and trimming runs instantly in your browser.
Is my audio file uploaded to a server when I trim it?
No. The Audio Trimmer runs entirely in your browser using JavaScript and WebAssembly, so your file is processed on your own device. It never uploads to a server, which keeps private recordings, voice memos, and music files on your machine the whole time.
Can I cut a section out of an MP3 without installing software?
Yes. The Audio Trimmer works in your web browser with no downloads or installation. Load an MP3, choose the part you want, and export the trimmed clip. Because everything happens locally, you can trim audio on most modern browsers without extra apps.
Does trimming audio in the browser reduce the sound quality?
Trimming removes a portion of the timeline without re-encoding the kept audio, so the section you keep retains its original quality. You select the start and end, and the tool outputs only that part. No re-recording or quality-lowering compression is forced on your clip.
How to use Audio Trimmer.
Upload your file
Drag and drop or click to select your file.
Choose settings
Adjust quality, size, or format options.
Download result
Your processed file is ready instantly.
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