Free Online Audio Mixer
Professional multi-track audio mixing
Mix multiple audio tracks with precision control over volume, pan, and timing. Features master volume, normalization, limiter protection, and automatic ducking. All processing happens locally in your browser for complete privacy.
Upload Audio Tracks
Drag and drop multiple audio files to mix together
Supports: Supports MP3, WAV, FLAC, AAC, M4A, OGG, and more
How It Works
Simple, secure, and professional multi-track audio mixing
Upload Audio Tracks
Drag and drop multiple audio files to mix together. Supports MP3, WAV, FLAC, AAC, OGG, and more.
Adjust Track Controls
Set volume (0-200%), pan position, and delay offset for each track. Use mute and solo for precise control.
Configure Mix Settings
Set master volume, choose output format, enable normalization, and configure limiter protection.
Download Mixed Audio
Download your professionally mixed audio with all tracks blended perfectly together.
Why Choose Our Audio Mixer?
Experience professional-grade multi-track mixing with cutting-edge browser technology
100% Private & Secure
All processing happens locally in your browser. No files are uploaded to our servers.
Professional Controls
Per-track volume, pan, and delay controls. Mute and solo for precise editing.
Multiple Mix Modes
Choose between parallel mixing or auto-duck mode to reduce background when voice is detected.
Master Processing
Master volume control with loudness normalization (EBU R128) and peak limiter protection.
High-Quality Output
Export in multiple formats (MP3, WAV, FLAC, AAC, OGG) with customizable sample rate and bitrate.
Visual Track Colors
Color-coded tracks for easy identification and organization of multiple audio sources.
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Frequently Asked Questions
What is an audio mixer and how does it work?
An audio mixer combines multiple audio tracks into a single output file. It allows you to control the volume, stereo position (pan), and timing (delay) of each track. Our mixer supports parallel mixing where all tracks play simultaneously, as well as auto-duck mode which automatically reduces background tracks when voice is detected. All processing uses FFmpeg.wasm running directly in your browser.
How is this different from an audio joiner?
An audio joiner concatenates files sequentially (one after another), while a mixer plays them in parallel (simultaneously). Use a joiner to combine separate song files into a playlist. Use a mixer to blend multiple audio sources (like music, vocals, and sound effects) into a single composition.
What are volume, pan, and delay controls?
Volume adjusts loudness (0-200%, with 100% being original level). Pan controls stereo position from left (-100) to center (0) to right (+100). Delay sets when a track starts playing, useful for synchronizing multiple recordings or creating echo effects. All controls can be adjusted in real-time before mixing.
What is normalization and when should I use it?
Normalization adjusts overall loudness to a consistent target level using the EBU R128 standard. Choose -23 LUFS for broadcast, -16 LUFS for podcasts, or -14 LUFS for music. Enable normalization when mixing tracks with varying loudness levels to ensure professional, consistent output volume.
What does the peak limiter do?
The peak limiter prevents audio distortion (clipping) by automatically reducing peaks that exceed the threshold (default -1 dBTP). This is especially important when mixing multiple loud tracks or when boosting volume above 100%. We recommend keeping the limiter enabled for all mixes.
How do mute and solo buttons work?
Mute silences a track while keeping it in the mix list. Solo isolates one or more tracks - when any track is soloed, all non-soloed tracks are automatically muted. This is useful for previewing individual tracks or specific combinations before the final mix.
What is auto-duck mode?
Auto-duck mode automatically reduces background music when voice or speech is detected, then restores it when speaking stops. This is commonly used in podcasts, voiceovers, and radio broadcasting. Set the duck amount (0-20 dB) to control how much the background reduces.
What audio formats are supported?
Input formats: MP3, WAV, FLAC, AAC, M4A, OGG, WMA, AIFF, and most common audio formats. Output formats: MP3, WAV, FLAC, AAC, OGG, M4A. You can also customize sample rate (44.1kHz, 48kHz, 96kHz) and bitrate for lossy formats.
Can I save my mix settings for later?
Yes! Your mix settings (master volume, normalization, limiter, output format) are automatically saved in your browser using local storage. However, uploaded tracks are not saved and must be added again in each session for privacy reasons.
Is there a limit on file size or number of tracks?
File size and track count are limited only by your device's available memory. Modern browsers can typically handle 10-20 tracks with total size under 500MB. For larger projects, consider mixing in stages or reducing track count. All processing happens in your browser, so performance depends on your device's specifications.
Is this tool really free and private?
Yes, completely free with no hidden costs or subscriptions. All processing happens locally in your browser using WebAssembly. Your audio files never leave your device and are not uploaded to any server. No account, registration, or personal information is required.