Audio Trimmer - Online Cut MP3 WAV Locally

This is a 100% local, browser-based audio trimming tool. It allows you to cut MP3, WAV, OGG, FLAC, and M4A files directly in your browser without uploading anything to any server. Your files stay on your device, ensuring complete privacy and security. Simply load an audio file, drag the handles to select the portion you want, and download the trimmed result.

No. All processing happens locally on your device using the Web Audio API. Your audio files are never transmitted, stored, or accessible by any third party. This is one of the key advantages over server-based trimming tools — complete privacy and zero data transfer.

The trimmed audio is exported as a WAV file (16-bit PCM, uncompressed). WAV is a lossless format compatible with virtually all devices and audio software. While the original file may be MP3, OGG, or another compressed format, the trimmed output is WAV to preserve the highest possible quality after the cut. If you need MP3 output, you can easily convert the WAV using a separate converter tool.

No quality loss within the trimmed segment. The tool extracts the selected portion and saves it as a lossless WAV file. The audio data within your selection remains bit-perfect. However, note that if your original file is a lossy format like MP3, the WAV output will reflect the quality of the decoded MP3 — it won't magically restore lost data, but it won't degrade further either.

Trimming precision is sample-accurate — down to 1/sample_rate seconds. For a standard 44.1kHz audio file, that's approximately 0.023 milliseconds. You can set precise start and end times manually using the time input fields (format: MM:SS.mmm), use the draggable handles on the waveform for visual selection, or use the quick action buttons for common cuts like first 10 seconds or last 10 seconds.

The tool supports MP3, WAV, OGG, FLAC, M4A (AAC), and WebM audio files — essentially any format that your browser's native audio decoder can handle. Most modern browsers (Chrome, Firefox, Safari, Edge) support all these formats. If a file fails to load, it may be in an unsupported or corrupted format.

There is no hard limit, but very large files (200MB+) may cause performance issues depending on your device's available RAM. The entire audio file is decoded into memory for processing. For typical use cases — trimming ringtones, extracting song clips, cutting podcast segments — files are well within comfortable limits. The waveform rendering is optimized to handle files of any length smoothly.

Yes! The tool is fully responsive and works on iOS and Android devices. The touch-friendly handles are enlarged on mobile for easy dragging, and the interface adapts to smaller screens. You can trim audio files directly from your phone's storage or recorded voice memos.

This tool is designed for quick, simple trims — no installation required, works in any browser, and is perfect for fast edits. Unlike Audacity or Adobe Audition, it doesn't offer multi-track editing, effects, or advanced features. But for the common task of cutting out a section of audio, it's faster and more convenient than launching a full DAW.

Browsers can decode MP3 and other compressed formats natively, but they cannot encode to MP3 without additional libraries (due to patent/licensing restrictions). The Web Audio API outputs uncompressed PCM data, which we package as a WAV file. WAV is universally supported and lossless. If you specifically need MP3 output, you can use a free online WAV-to-MP3 converter after trimming.