Audio Utilities

Online Audio Processing Tools

All audio decoding, trimming, and MP3 encoding runs locally inside your browser memory using the Web Audio API. Your private voice memos, music, and recordings are never uploaded to any server.

100% Private · Runs locally in your browser 0 KB Uploaded

How Local Processing Works

1

Selected in Browser Memory

When you select or drop a file, your browser creates a temporary local Blob / ArrayBuffer pointer directly in your device's RAM.

2

Processed Client-Side

Our client-side engine (HTML5 Canvas & Client JavaScript) processes the data directly using your computer or phone's CPU.

3

Saved Directly to Your Downloads

The resulting output is downloaded immediately to your device. When you close or refresh the tab, memory is cleared automatically.

Verify It Yourself

Open your browser's Developer Tools (F12 or Ctrl+Shift+I), switch to the Network tab, and convert any file. You will see zero network POST requests carrying file data.

🔄 Audio Converters

Convert between uncompressed PCM WAV and lightweight MP3 with custom quality controls.

Featured

MP4 to MP3 Converter

Extract audio tracks from MP4 video files into MP3 format with custom bitrate selection.

Extract MP3 →
Featured

Universal Audio Converter

Universal client-side audio conversion between WAV, MP3, and browser-supported audio formats with custom bitrates from 128 kbps to 320 kbps.

Open Converter →

WAV to MP3 Converter

Compress heavy studio WAV recordings into universally compatible MP3 format. Cut file weight by up to 90% while preserving clarity.

Convert to MP3 →

MP3 to WAV Converter

Decompress MP3 audio files to 16-bit linear PCM WAV for professional DAWs, sound synthesis, and video editing suites.

Convert to WAV →

✂️ Audio Editing

Cut sound files to millisecond-precise durations for custom ringtones and clips.

Audio Trimmer & Cutter

Set custom start and end points, preview the cut audio in real-time, and export trimmed snippets as MP3 or WAV files.

Trim Audio →

⚡ Audio Optimization

Re-encode audio at lower bitrates to fit email and messaging attachment limits.

Audio Compressor

Shrink voice notes, lectures, and music tracks by re-encoding to 64 kbps, 96 kbps, or 128 kbps. Save up to 80% disk space.

Compress Audio →

100% Client-Side Privacy

Unlike online audio converters that transmit sensitive recordings to remote servers, FreeFileTool decodes and encodes audio directly on your device's CPU and RAM.

Cross-Browser Codec Support

WAV and MP3 decoding is universally supported across Chrome, Safari, Firefox, and Edge. Apple iOS/WebKit does not reliably support OGG decoding, so we prioritize reliable WAV and MP3 pipelines.

Comprehensive Format Guide

Understand sample rates, lossy vs. lossless compression, and bitrate selection in our technical guide: WAV vs MP3: Which Format to Use? →