✦ToolMagic

Audio Converter

Convert audio files with custom sample rate, channels, and bit depth — entirely in your browser.

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Drop an audio file here or click to upload

Supports MP3, WAV, OGG, M4A, FLAC, WebM

What is the Audio Converter Tool?

The Audio Converter is a powerful browser-based tool that converts audio files between different sample rates, channel configurations, and bit depths without uploading anything to a server. Using the Web Audio API and OfflineAudioContext, it resamples your audio locally on your device and outputs a high-quality WAV file with your exact specifications. Whether you need to downsample a 48kHz recording to 16kHz for speech recognition, convert stereo to mono for a podcast, or change bit depth from 32-bit float to 16-bit integer for compatibility, this tool handles it all instantly and privately. It supports any audio format your browser can decode — MP3, WAV, OGG, M4A, FLAC, WebM, and more — and outputs perfectly formatted WAV files with correct headers. No software installation, no account creation, no file uploads. Just drag, configure, and convert.

How to Use the Audio Converter

  1. Upload audio: Drag and drop a file or click to browse. Any browser-supported audio format works.
  2. Review file info: See the input file's format, duration, size, sample rate, and channel count.
  3. Choose output settings: Select your desired sample rate (8000–48000 Hz), channels (mono/stereo), and bit depth (16-bit/32-bit float).
  4. Convert: Click the convert button. The tool resamples your audio using OfflineAudioContext.
  5. Compare & download: View waveform previews of both input and output, compare file sizes, and download the converted WAV.

Features

  • Sample rate conversion: Choose from 8000, 16000, 22050, 44100, or 48000 Hz output sample rates.
  • Channel conversion: Convert between mono and stereo with proper downmixing or upmixing.
  • Bit depth options: Output as 16-bit PCM integer or 32-bit IEEE float.
  • Dual waveform preview: Visual comparison of input and output audio waveforms side by side.
  • File size comparison: See exactly how output settings affect file size versus the original.
  • Universal input: Accepts any format your browser decodes — MP3, WAV, OGG, M4A, FLAC, WebM, and more.
  • 100% private: All conversion happens locally in your browser. No files are uploaded anywhere.
  • No dependencies: Built with native Web Audio API — no FFmpeg, no external libraries.

Use Cases

  • Speech recognition prep: Convert audio to 16kHz mono 16-bit WAV, the standard input for most speech-to-text APIs.
  • Podcast production: Standardize episode audio to 44100 Hz stereo before editing.
  • Game audio: Convert sound effects to specific sample rates and channel configurations required by game engines.
  • Phone/IVR systems: Produce 8000 Hz mono audio for telephony applications.
  • Music production: Resample tracks to match your DAW's project settings.
  • Web audio: Optimize audio files for web delivery by reducing sample rate and switching to mono.

Frequently Asked Questions

What input formats are supported?

Any audio format your browser can decode — typically MP3, WAV, OGG, M4A, AAC, FLAC, and WebM. The browser's built-in audio decoder handles format detection automatically.

Why is the output WAV only?

WAV files can be constructed natively in the browser by writing PCM data with a correct header — no external encoding libraries needed. For MP3 output, you'd need a third-party encoder. WAV is lossless and universally compatible.

What's the difference between 16-bit and 32-bit float?

16-bit PCM is the CD standard — smaller files, 96dB dynamic range, widely compatible. 32-bit float offers more headroom and precision for professional audio work but produces larger files.

Will converting sample rate reduce quality?

Downsampling removes frequencies above half the new sample rate (Nyquist frequency). For speech, 16kHz is usually sufficient. For music, 44100 Hz preserves full audible range. The browser's resampler applies proper anti-aliasing.

Is my audio uploaded to any server?

No. All processing uses the Web Audio API locally in your browser. Your audio data never leaves your device.

Can I convert large files?

Yes, though very large files may take longer depending on your device. The OfflineAudioContext processes audio as fast as your CPU allows, which is typically much faster than real-time.

Related Tools

Use the Audio Extractor to pull audio from video files first, or the Audio Remove Silences tool to clean up your recordings.