No. This tool processes everything locally in your browser using the Web Audio API. Your files never leave your device — ensuring complete privacy and security. This also means it works offline after the page loads.

The tool exports audio as 16-bit PCM WAV format — a lossless, uncompressed format compatible with virtually all audio players, DAWs, and editing software. WAV ensures no quality loss during the trim/split process. Your original MP3 or compressed file is decoded and re-encoded to WAV for precise frame-accurate cuts.

Trim mode: Select a single range (start & end) and either keep that portion or remove it. Ideal for cutting intros, outros, or unwanted sections.
Split mode: Add multiple split markers to divide audio into several segments. Each segment can be previewed and downloaded individually — perfect for splitting long recordings, podcasts, or albums into tracks.

The tool supports all audio formats that your browser can decode. This typically includes MP3, WAV, OGG, AAC, FLAC, and M4A. For best compatibility across all major browsers (Chrome, Firefox, Safari, Edge), MP3 and WAV are recommended. If a file fails to decode, the tool will display an error message.

Cuts are sample-accurate — the highest precision possible in digital audio. The tool operates at the sample level (e.g., 44,100 samples per second for CD-quality audio), meaning there's zero quality degradation at cut boundaries. You can manually type exact timestamps (down to milliseconds) for surgical precision.

Absolutely! The tool is fully responsive and touch-optimized. You can drag handles on the waveform with your finger, use time input fields for precise values, and all buttons are sized for comfortable tapping. Works on iOS Safari and Android Chrome.

MP3 is a compressed format that sacrifices some audio data for smaller file size. WAV is uncompressed and lossless, preserving full audio fidelity. When you trim an MP3 and export as WAV, the output contains the full uncompressed PCM data of the selected portion — which is naturally larger. This is normal and ensures no quality loss from re-compression.